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INTRODUCTION The jaw (Upper and lower) is any opposable articulated structure at the entrance of the mouth. It is typically used for grasping and manipulating food. Jaw suspension means the fusion of upper jaw and lower jaw or skull for efficient biting. There are different ways in which these attachments are attained depending upon the modifications in visceral arches in vertebrates. In most vertebrates, the jaws are bony or cartilaginous and oppose vertically. The vertebrate jaw is derived from the most anterior two pharyngeal arches supporting the gills, and usually bears numerous teeth. The vertebrate jaw probably originally evolved in the Silurian period and appeared in the Placoderm fish which further diversified in the Devonian. It is believed that the hyoid system suspends the jaw from the brain case of the skull, permitting great mobility of the jaws. The original selective advantage offered by the jaw may not be related to feeding, but rather to increased respiration efficiency. The jaws were used in the buccal pump (observable in modern fish and amphibians) that pumps water across the gills of fish or air into the lungs in the case of amphibians. Over evolutionary time the more familiar use of jaws (to humans), in feeding, was selected for and became a very important function in vertebrates. Many teleost fish have substantially modified jaws for suction feeding and jaw protrusion, resulting in highly complex jaws with dozens of bones involved. Jaw Suspension or Suspensoria: The method by which the upper and lower jaws are suspended or attached from the chondrocranium is known as jaw suspension or suspensorium. Amongst the visceral arches, the first (mandibular) arch consists of = a dorsal palato pterygoquadrate bar forming the upper jaw, = and ventral Meckel’s cartilage forms the lower jaw. The second (hyoid) arch consists of = a dorsal hyomandibular supporting and suspending the jaws with the cranium, and a ventral hyoid. The remaining visceral arches support the gills and are, hence, called branchial arches. Thus, splanchnocranium forms the jaws and suspends them with the chondrocranium.
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Briefly discuss the adaptive changes seen in the chordates over the other animal phyla? Solution Animals in the phylum Chordata reveal four key features that appear at some point all through their development. a. Notochord - The chordates are called for the notochord: a flexible, rod-shaped design that is found within the embryonic stage of most chordates and also in the adult stage of some chordate species. It is found between the intestinal pipe and the nerve cord, providing skeletal help through along the body. In some chordates, the notochord acts while the primary axial support of the human body throughout the animal\'s lifetime. In vertebrates, the notochord is provide during embryonic development, of which time it induces the development of the neural pipe which acts as an assistance for the developing embryonic body. The notochord, however, is replaced by the vertebral column (spine) in most adult vertebrates. b.Dorsal Hollow Nerve Cord - The dorsal hollow nerve cord derives from ectoderm that sheets into a worthless pipe all through development. In chordates, it is found dorsally (at the top of the animal) to the notochord. In contrast to the chordates, other animal phyla are known by strong nerve cables which are positioned either ventrally or laterally. The nerve cord within most chordate embryos develops into the brain and spinal cord, which include the main anxious system. c.Pharyngeal Slits - Pharyngeal slits are openings in the pharynx (the place just posterior to the mouth) that expand to the surface environment. In organisms that are now living in aquatic surroundings, pharyngeal slits allow for the quit of water that enters the mouth all through feeding. Some invertebrate chordates use the pharyngeal slits to filtration food out of the water that enters the mouth. In vertebrate fishes, the pharyngeal slits develop into gill arches, the bony or cartilaginous gill supports. In most terrestrial animals, including mammals and birds, pharyngeal slits are providing just during embryonic development. In these animals, the pharyngeal slits develop into the jaw and inner ear bones. d.Post-anal Tail - The post-anal tail is a posterior elongation of the human body, increasing beyond the anus. The trail contains skeletal things and muscles, which give a way to obtain locomotion in aquatic species. In some terrestrial vertebrates, the trail also assists with stability, courting, and signaling when risk is near. In individuals and other apes, the post-anal tail is provide during embryonic development, but is vestigial as an adult..
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Anth 330 Fall 2015 Summation paper This is a summation document so there is no right or wrong answer but I do want to see that you put some serious thought into your response. I have found that a great many people know very little about human evolution. There tends to be more fiction than fact out there. Other than a few bits of historical fact and fiction (mostly concerning Charles Darwin) many people have a poor understanding of the historical development of the concept of biological evolution and the Western World’s concept of time. 1. Briefly summarize your understanding of the concept of human evolution and geological/archaeological time before you took this course. I expect your answer to be at least 2 pages and no more than three. 2. How have your concepts on these subjects changed having taken this course? -What are the TWO most interesting ideas that you have gleaned from the readings or lecture material? I expect your answer to be at least 2 pages and no more than three. 3. Has any information touched on in this class made you think about taking any further course work in the subject area? 1 Lecture 7 Lecture Summary In this lecture will continue the text’s discussion of bipedalism. This lecture will also provide some further information on the early hominids: Ardipithecus, Australopithecus, and Homo and their associated biocultural evolution. Bipedalism Perhaps the most crucial change in early hominid evolution was the development of bipedal locomotion – walking on two legs. We know from the fossil record that other important changes such as the expansion of the brain, modification of the female pelvis to allow bigger-brained babies to be born, and significant reduction of the face, teeth, and jaws, did not occur until about 2 million years after the emergence of bipedalism. Be familiar with the specific anatomical features associated with bipedalism as described in chapter 6 of your text. Why did we evolve to become bipedal? There are at least 6 different models that have been proposed to account for the evolution of bipedalism: 1.) Carrying model – bipedalism could have allowed our ancestors to search for and collect food in greater safety and with greater efficiency by freeing the arms and hands. Mothers could carry their children. They could carry sticks and rocks to throw at predators and scavengers. 2.) Vigilance model – bipedalism, by elevating the head, helped our ancestors locate potential food sources and dangers. This behavior is seen in other animals, squirrels and apes, but says more about upright posture than it does of actual locomotion. 3.) Heat dissipation model – the vertical orientation of the body in bipedalism helps cool the body by presenting a smaller target to the equatorial sun rays and placing more of the body above ground to catch cooling air currents. This model applies to hominids in the hot savannah but not so much in the shady forested are.
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All animals have external structures, or bodily organs on the outside. The majority of animals have a head, a body covering, limbs, and a tail of some kind. These body parts are all essential to an animal's ability to live and reproduce, despite the fact that they may appear differently on different animals. The limbs of mammals may be modified for a particular movement. They could be taught how to swim, fly, climb, and run. More commonly known as "ricochetal locomotion," saltatory (leaping) movement has been observed in a variety of unrelated species (some marsupials, lagomorphs, and several independent lineages of rodents). The skin of mammals, like that of other vertebrates, consists of epidermal and dermal layers. It protects against actual injury, microbiological invasion, and UV rays from the sun. skin is also important for temperature regulation, sensory perception excretion, and water regulation. Hairs are a keratinized derivative of the epidermis of the skin and are uniquely mammalian. It is seated in an invagination of the epidermis called a hair follicle. Two distinct kinds of hair typically compose a pelage, a coat of hair. Long guard hairs protect a dense coat of shorter, insulating under hairs. Hair must periodically molt because it is made mainly of dead cells. In some mammals (e.g., humans), molting occurs gradually and may not be noticed. Others have rapid hair loss, which could alter the characteristics of their pelage. In the fall, many mammals acquire a thick coat of insulting under hair, and the pelage color may change. For example, the Arctic fox takes on a white or cream color with its autumn molt, which helps conceal the fox in a snowy environment. with its spring molt, the Arctic fox acquires a gray and yellow pelage Hairs are also important for the sense of touch. The mechanical displacement of hair stimulates nerve cells associated with the hair root. Guard hairs may sometimes be modified into thick-shifted hairs called vibrissae. Vibrissae occur around the legs, nose, mouth, and eyes of very sensitive to displacement. Air space in the hair shaft and hair trapped between hairs and the skin provides an effective insulating layer. A band of smooth muscle, called the arrector pili muscle, runs between the hair follicle and lower epidermis. when the muscle contract, the hair stands upright, increasing the amount of air trapped the in the pelage and improving its insulating properties. Arrector pili muscles are under the control of the autonomic nervous system, which also controls a mammal's "fight-or-flight" response. In threatening situations, the hair stands on end and may give the perception of increased size and strength. Hair color depend on the number of pigments (melanin) deposited in it and the quantity of air in the hair shaft. The pelage of most mammals is dark above and lighter underneath. This pattern them less conspicuous under most conditions. Some mammals advertised their defenses using aposematic (warning
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PRIMATES (ORDER) Suborder Infraorder Superfamily Family Sub-‐family Hominoid Common Names STREPSIRHINES HAPLORHINES Platyrrhines Catarrhines Hominoids Cercopithecoids Cercopithecids Gibbons Siamangs HylobaCds Pongids Hominids Chimp Gorilla Bonobo Orangutan Humans Cercopithecines Colobines Baboons Macaques Guenons Colobus monkeys Langurs Tarsiers Ceboids Calltrichids Cebids Atelids Lemurs Lorises Galagos PRIMATES (what YOU need to know) STREPSIRHINES HAPLORHINES LEMURS, LORISES, GALAGOS Platyrrhines Catarrhines Hominoids Cercopithecoids LESSER APES Gibbons Siamangs GREAT APES Chimp Gorilla Bonobo Orangutan HUMANS! OLD WORLD MONKEYS Baboons (Also macaques, guenons, colobus monkeys, langurs) Tarsiers NEW WORLD MONKEYS Know an example (e.g., tamarins) Cercopithecines Colobines ATH 2100_Exam 2_Review Key Terms: Taxonomy Phylogeny Ancestral/Derived Traits Foraging Strategy Dental formula Heterodont Knuckle-walking Strepsirhine/Haplorhine Platyrrhine/Catarrhine Cercopithecoid Hominoid/Hominid/Hominin Adaptive Radiation Paleoanthropology Taphonomy Relative vs Chronometric dating Law of Superposition Homology Homoplasy Phylogram/Phylogenetic Tree Cladogram Parsimony Convergent Evolution Plesiadapiformes Ethogram Sampling methods Key Concepts: How is Linnean taxonomy organized? Where do primates fit into Linnean taxonomy? What are the ancestral traits that unite primates with other mammals? What are the derived traits that unite primates compared to mammals? (Be specific!) What are the different types of primate diets? How does diet influence activity and foraging strategies? What are the different forms of locomotion found in primates? How is this reflected in their anatomies? What are characteristics of each major primate taxonomic group? (Strepsirhines, Haplorhines, Platyrrhines, Catarrhines, Hominoids, Cercopithecines, Colobines) What’s the deal with the tarsier? Pay attention to the social behavior of great apes. How are they different from other primates? Compare chimpanzee and bonobo behaviors. Why live in a group as a primate? What ways do they adapt to living in groups? Different mating/social systems (polygyny, polyandry, monogamy, solitary) When and why do we see sexual dimorphism? When don’t we see sexual dimorphism? How is human language different from non-human primate language? What have we learned from Great Ape language studies? What are some arguments to support culture in apes? Primate conservation Primates as models How do we get fossils? Methods of dating fossils What are the different methods of classification? What traits do each use?.
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E X E R C I S E 9 The Axial Skeleton 121 Materials ● Intact skull and Beauchene skull ● X-ray images of individuals with scoliosis, lordosis, and kyphosis (if available) ● Articulated skeleton, articulated vertebral column, removable intervertebral discs ● Isolated cervical, thoracic, and lumbar vertebrae, sacrum, and coccyx ● Isolated fetal skull For related exercise study tools, go to the Study Area of MasteringA&P. There you will find: ● Practice Anatomy Lab ● PhysioEx ● A&PFlix ● Practice quizzes, Histology Atlas, eText, Videos, and more! Pre-Lab Quiz 1. The axial skeleton can be divided into the skull, the vertebral column, and the: a. thoracic cage c. hip bones b. femur d. humerus 2. Eight bones make up the , which encloses and protects the brain. a. cranium b. face c. skull 3. How many bones of the skull are considered facial bones? 4. Circle the correct underlined term. The lower jawbone, or maxilla / mandible, articulates with the temporal bones in the only freely movable joints in the skull. 5. Circle the correct underlined term. The body / spinous process of a typical vertebra forms the rounded, central portion that faces anteriorly in the human vertebral column. 6. The seven bones of the neck are called vertebrae. a. cervical b. lumbar c. spinal d. thoracic 7. The vertebrae articulate with the corresponding ribs. a. cervical b. lumbar c. spinal d. thoracic 8. The , commonly referred to as the breastbone, is a flat bone formed by the fusion of three bones: the manubrium, the body, and the xiphoid process. a. coccyx b. sacrum c. sternum 9. Circle True or False. The first seven pairs of ribs are called floating ribs because they have only indirect cartilage attachments to the sternum. 10. A fontanelle: a. is found only in the fetal skull b. is a fibrous membrane c. allows for compression of the skull during birth d. all of the above Objectives □ Name the three parts of the axial skeleton. □ Identify the bones of the axial skeleton, either by examining isolated bones or by pointing them out on an articulated skeleton or skull, and name the important bone markings on each. □ Name and describe the different types of vertebrae. □ Discuss the importance of intervertebral discs and spinal curvatures. □ Identify three abnormal spinal curvatures. □ List the components of the thoracic cage. □ Identify the bones of the fetal skull by examining an articulated skull or image. □ Define fontanelle, and discuss the function and fate of fontanelles. □ Discuss important differences between the fetal and adult skulls. 122 Exercise 9 9 The axial skeleton (the green portion of Figure 8.1 on p. 108) can be divided into three parts: the skull, the ver-tebral column, and the thoracic cage. This division of the skeleton forms the longitudinal axis of the body and protects the brain, spinal cord, heart, and lungs. The Skull The skull is composed of two sets of bones. Tho ...
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All animals have external structures, or bodily organs on the outside. The majority of animals have a head, a body covering, limbs, and a tail of some kind. These body parts are all essential to an animal's ability to live and reproduce, despite the fact that they may appear differently on different animals. The limbs of mammals may be modified for a particular movement. They could be taught how to swim, fly, climb, and run. More commonly known as "ricochetal locomotion," saltatory (leaping) movement has been observed in a variety of unrelated species (some marsupials, lagomorphs, and several independent lineages of rodents). The skin of mammals, like that of other vertebrates, consists of epidermal and dermal layers. It protects against actual injury, microbiological invasion, and UV rays from the sun. skin is also important for temperature regulation, sensory perception excretion, and water regulation. Hairs are a keratinized derivative of the epidermis of the skin and are uniquely mammalian. It is seated in an invagination of the epidermis called a hair follicle. Two distinct kinds of hair typically compose a pelage, a coat of hair. Long guard hairs protect a dense coat of shorter, insulating under hairs. Hair must periodically molt because it is made mainly of dead cells. In some mammals (e.g., humans), molting occurs gradually and may not be noticed. Others have rapid hair loss, which could alter the characteristics of their pelage. In the fall, many mammals acquire a thick coat of insulting under hair, and the pelage color may change. For example, the Arctic fox takes on a white or cream color with its autumn molt, which helps conceal the fox in a snowy environment. with its spring molt, the Arctic fox acquires a gray and yellow pelage Hairs are also important for the sense of touch. The mechanical displacement of hair stimulates nerve cells associated with the hair root. Guard hairs may sometimes be modified into thick-shifted hairs called vibrissae. Vibrissae occur around the legs, nose, mouth, and eyes of very sensitive to displacement. Air space in the hair shaft and hair trapped between hairs and the skin provides an effective insulating layer. A band of smooth muscle, called the arrector pili muscle, runs between the hair follicle and lower epidermis. when the muscle contract, the hair stands upright, increasing the amount of air trapped the in the pelage and improving its insulating properties. Arrector pili muscles are under the control of the autonomic nervous system, which also controls a mammal's "fight-or-flight" response. In threatening situations, the hair stands on end and may give the perception of increased size and strength. Hair color depend on the number of pigments (melanin) deposited in it and the quantity of air in the hair shaft. The pelage of most mammals is dark above and lighter underneath. This pattern them less conspicuous under most conditions. Some mammals advertised their defenses using aposematic (warning
External Structure and locomotion.pdf
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PRIMATES (ORDER) Suborder Infraorder Superfamily Family Sub-‐family Hominoid Common Names STREPSIRHINES HAPLORHINES Platyrrhines Catarrhines Hominoids Cercopithecoids Cercopithecids Gibbons Siamangs HylobaCds Pongids Hominids Chimp Gorilla Bonobo Orangutan Humans Cercopithecines Colobines Baboons Macaques Guenons Colobus monkeys Langurs Tarsiers Ceboids Calltrichids Cebids Atelids Lemurs Lorises Galagos PRIMATES (what YOU need to know) STREPSIRHINES HAPLORHINES LEMURS, LORISES, GALAGOS Platyrrhines Catarrhines Hominoids Cercopithecoids LESSER APES Gibbons Siamangs GREAT APES Chimp Gorilla Bonobo Orangutan HUMANS! OLD WORLD MONKEYS Baboons (Also macaques, guenons, colobus monkeys, langurs) Tarsiers NEW WORLD MONKEYS Know an example (e.g., tamarins) Cercopithecines Colobines ATH 2100_Exam 2_Review Key Terms: Taxonomy Phylogeny Ancestral/Derived Traits Foraging Strategy Dental formula Heterodont Knuckle-walking Strepsirhine/Haplorhine Platyrrhine/Catarrhine Cercopithecoid Hominoid/Hominid/Hominin Adaptive Radiation Paleoanthropology Taphonomy Relative vs Chronometric dating Law of Superposition Homology Homoplasy Phylogram/Phylogenetic Tree Cladogram Parsimony Convergent Evolution Plesiadapiformes Ethogram Sampling methods Key Concepts: How is Linnean taxonomy organized? Where do primates fit into Linnean taxonomy? What are the ancestral traits that unite primates with other mammals? What are the derived traits that unite primates compared to mammals? (Be specific!) What are the different types of primate diets? How does diet influence activity and foraging strategies? What are the different forms of locomotion found in primates? How is this reflected in their anatomies? What are characteristics of each major primate taxonomic group? (Strepsirhines, Haplorhines, Platyrrhines, Catarrhines, Hominoids, Cercopithecines, Colobines) What’s the deal with the tarsier? Pay attention to the social behavior of great apes. How are they different from other primates? Compare chimpanzee and bonobo behaviors. Why live in a group as a primate? What ways do they adapt to living in groups? Different mating/social systems (polygyny, polyandry, monogamy, solitary) When and why do we see sexual dimorphism? When don’t we see sexual dimorphism? How is human language different from non-human primate language? What have we learned from Great Ape language studies? What are some arguments to support culture in apes? Primate conservation Primates as models How do we get fossils? Methods of dating fossils What are the different methods of classification? What traits do each use?.
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E X E R C I S E 9 The Axial Skeleton 121 Materials ● Intact skull and Beauchene skull ● X-ray images of individuals with scoliosis, lordosis, and kyphosis (if available) ● Articulated skeleton, articulated vertebral column, removable intervertebral discs ● Isolated cervical, thoracic, and lumbar vertebrae, sacrum, and coccyx ● Isolated fetal skull For related exercise study tools, go to the Study Area of MasteringA&P. There you will find: ● Practice Anatomy Lab ● PhysioEx ● A&PFlix ● Practice quizzes, Histology Atlas, eText, Videos, and more! Pre-Lab Quiz 1. The axial skeleton can be divided into the skull, the vertebral column, and the: a. thoracic cage c. hip bones b. femur d. humerus 2. Eight bones make up the , which encloses and protects the brain. a. cranium b. face c. skull 3. How many bones of the skull are considered facial bones? 4. Circle the correct underlined term. The lower jawbone, or maxilla / mandible, articulates with the temporal bones in the only freely movable joints in the skull. 5. Circle the correct underlined term. The body / spinous process of a typical vertebra forms the rounded, central portion that faces anteriorly in the human vertebral column. 6. The seven bones of the neck are called vertebrae. a. cervical b. lumbar c. spinal d. thoracic 7. The vertebrae articulate with the corresponding ribs. a. cervical b. lumbar c. spinal d. thoracic 8. The , commonly referred to as the breastbone, is a flat bone formed by the fusion of three bones: the manubrium, the body, and the xiphoid process. a. coccyx b. sacrum c. sternum 9. Circle True or False. The first seven pairs of ribs are called floating ribs because they have only indirect cartilage attachments to the sternum. 10. A fontanelle: a. is found only in the fetal skull b. is a fibrous membrane c. allows for compression of the skull during birth d. all of the above Objectives □ Name the three parts of the axial skeleton. □ Identify the bones of the axial skeleton, either by examining isolated bones or by pointing them out on an articulated skeleton or skull, and name the important bone markings on each. □ Name and describe the different types of vertebrae. □ Discuss the importance of intervertebral discs and spinal curvatures. □ Identify three abnormal spinal curvatures. □ List the components of the thoracic cage. □ Identify the bones of the fetal skull by examining an articulated skull or image. □ Define fontanelle, and discuss the function and fate of fontanelles. □ Discuss important differences between the fetal and adult skulls. 122 Exercise 9 9 The axial skeleton (the green portion of Figure 8.1 on p. 108) can be divided into three parts: the skull, the ver-tebral column, and the thoracic cage. This division of the skeleton forms the longitudinal axis of the body and protects the brain, spinal cord, heart, and lungs. The Skull The skull is composed of two sets of bones. Tho ...
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Bioanth.2hominidskulls
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McKendricks
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