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The Muscular System

Muscular System and its part with Definition

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The Muscular System

  1. 1. The Muscular System moves the body. The body has almost 700 muscles, each of which consists of special fibers that can contract. When a muscle contracts, it pulls the tissue to which it is attached. This pulling results in movement. MUSCULAR SYSTEM
  2. 2. Muscle is the tough, elastic tissue that makes body parts move. All animals except the simplest kinds have some type of muscle. Muscles are found throughout the body. As a person grows, the muscle also get bigger. Muscle makes up nearly half the body weight of an adult. MUSCLE
  4. 4. Are attached to the bones. They move the bones of the arms, fingers, legs and other parts of the skeleton. We can consciously control the skeletal muscles, and so they are known as voluntary muscles. The fibers that make up a skeletal muscle have alternate light and dark cross bands called striations. Muscles move the body only by pulling. They usually move voluntarily and also may move involuntarily. SKELETAL MUSCLES
  5. 5. Are found in most in the body’s internal organs. Unlike skeletal muscles, smooth muscles do not have striations. Smooth muscles in the walls of the stomach and intestines move food through digestive system. In all these cases, the smooth muscles contract and relax automatically- that is, we do not consciously control them. For this reason, they are often called involuntary muscles. Smooth muscles can thus produce powerful, rhythmic contractions over long periods. SMOOTH MUSCLES
  6. 6. Smooth muscles are found in various organs of the body. They also are smaller than skeletal muscle fibers and have only one nucleus. Smooth muscles operate slowly and automatically in natural, rhythmic pattern of contraction followed by relaxation. SMOOTH MUSCLES
  7. 7. Cardiac muscle is a third kind of muscle that only found in the heart. It has feature of both skeletal and smooth muscle. Cardiac muscle makes up the wall of the heart. When its cells contract, they push blood out of the heart and into the arteries. CARDIAC MUSCLES
  8. 8. Cardiac muscle has striations like skeletal muscle, but like smooth muscle, it contracts automatically and rhythmically without tiring. Cardiac muscle enables the heart to beat an average of 70 times a minute without rest throughout a person’s lifetime. CARDIAC MUSCLES
  9. 9. FRONTALIS - the muscle of the forehead that forms part of the occipitofrontalis — called also Frontalis Muscle TRAPEZIUS - a large flat triangular superficial muscle of each side of the upper back
  10. 10. DELTOID - a large muscle of the shoulder PECTORALIS - either of the muscles that connect the ventral walls of the chest with the bones of the upper arm and shoulder of which in humans there are two on each side
  11. 11. TRICEPS BRANCHII - the skeletal muscle having three origin that extends the forearm when it contracts BICEPS BRANCHII - a muscle that flexes and supinates the forearm LATISSIMUS DORSI - a broad, flat muscle on each side of the middle of the back. The action of which draws the arm backward and downward
  12. 12. ABDOMINAL MUSCLES - the muscles between the throax and the pelvis supporting the abdominal wall. GLUTEUS MAXIMUS - the largest of the three flat buttock or rump muscles. The gluteal muscle arise from the back of the pelvis and are inserted into the back of the upper part of the thigh bone(femur).
  13. 13. BICEPS FEMORIS - one of the posterior femoral muscles. It has two heads as its origin. RECTUS FEMORIS - a fusiform muscle of the anterior thigh, one of the four parts of the quadriceps femoris. With the quadriceps group it functions to extend the lower leg.
  14. 14. GASTROCNEMIUS - superficial muscle of posterior (plantar flexor) compartment of leg; by two heads (lateral and medial) from the lateral and medial condyles of the femur; insertion, with soleus by tendo, calceneus into lower half of posterior surface of calcaneus; action plantar flexion of foot; nerve supply, tibial.
  15. 15. ACHILLES TENDON - the strong tendon at the back of the heel that connects the calf muscle ( triceps surae muscle) to the heel bone. The name is derived from the legend of the Greek hero Achilles, who was vulnerable only in one heel. A large tendon conecting the heel bone to calf muscle of the leg
  16. 16. DISORDERS OF THE MUSCLES Muscles function through an amazing coordination of many elements. Occasionally, however, the normal operation of muscles is disturbed. CRAMP Is a painful, uncontrolled contraction of one or more muscles. It may involve any muscular area of the body. Cramps can occur either in skeletal muscles or in smooth muscles.
  17. 17. END