anatomy

1. ‫الرحمی‬ ‫الرمحن‬ ‫هللا‬ ‫سم‬‫ب‬
Carpal Bones Anatomy
Dr. Mossa Sultany
1398

2. The skeleton of the hand
Carpus
Metacarpus
phalanges

3. The carpus
Proximal row
• Scaphoid
• Lunate
• Triquetrum
• Pisiform
Distal row
• Trapezium
• Trapezoid
• Capitate
• hamate

4. Common characteristics of carpal bone
• Each bone has six surface(excepting pisiform)
• Volar (palmar, ant)
• Dorsal (pos)
• Sup (proximal)
• Inf (distal)
• Lat (outward)
• Med (inward)

5. Scaphoid
 Navicular bone
 Boat shape
 Lateral wrist side
The long axis is directed
downward, lateralward
and forward
 Surface
• 6 surface
sup
Inf
pos
med
ant

6. Scaphoid cont.…
Articulation: with 5 bones
 Proximal (radius)
 Distal (trapezium & trapezoid)
 Medial (capitate & lunate)
ant
Transverse carpal lig
Abductor pollicis
brevis
lat

7. lunate
• Semilunar carpal bone
• Crescent shape
• Centre of proximal row
• Six surface
• Articulates with 5 bone
 sup( radius)
 Inf (capitate and hamate)
 Med(triquetrum)
 lat (scaphoid)
sup
inf lat
med

8. triquetral
• Triquetrum,cunieform or triangular bone
• Distinguished by pyramidal shape and
single oval facet for pisiform
• Medial side of the wrist
sup
ant
inf
med
lat
summit
base

9. Triquetral cont…
Articulation: with 3 bone
• Lateral (lunate)
• Ant (pisiform)
• Inf (hamate)
• TFCC

10. Pisiform
 Smallest carpal bone
 Pea shaped
 On ant plane of carpal bone
 Distinguished by its small size and single
articular facet
 4 surface
 Ant and post
 Lat and med are rough
post ant
Flexor carpi
ulanris
Abductor
digiti quinti
Transverse
carpal lig

11. Trapezium
 Great multangular
 Irregular bone
 Distinguished by deep groove on
volar side
 Distal row on lateral side of the wrist
between scaphoid and 1st metacarpal
 Six surface
Supup/medinf
ant
ant
• Opponens pollicis
• Abductor pollicis
brevis
• Flexor pollicis brevis
• Transverse carpal lig
med

12. Trapezium cont…
 Articulation :articulates with 4 bones
Sup(scaphoid)
Inf (1st metacarpal)
Med(trapezoid and 2nd metacarpal)

13. trapezoid
Lesser multangular
Smallest bone in distal row
Wedge shaped, 4 articular facet, sharp edges sup
inf
pos
ant lat
med

14. Trapezoid cont…
• Articulations : with 4 bones
 sup (scaphoid)
 Inf (2nd metacarpal)
 Med(capitate)
 Lat(trapezium)

15. capitate
The magnum (largest) carpal bone
distal row at center of the wrist
Three portion( head, neck and body)
Six surface
head
body
neck
lat sup
inf
ant
Adductor
pollicis
oblique
med
lat

16. Capitate cont….
Articulation: with 7 bones
Sup(scaphoid and lunate)
Inf (2nd ,3rd and 4th )
Lat(trapezoid)
Med(hamate)

17. Hamate
 Unciform bone
 Distal row on ulnar side
 Wedged shaped (base, apex) and
hook like process on volar side
sup
inf
lat
med

18. Hamate cont….
• Hamulus attachments
 Apex
• Transverse carpal lig
• Flexor carpi ulanris
 Medial
• Flexor digiti brevis
• Opponens digiti brevis
 Lat
• Flexor tendons
apex med lat

19. The four eminence on volar plane
Radial carpal eminence
 Scaphoid tubercle
 Trapezium tubercle
Ulnar carpal eminence
 Hamate hook
 pisiform

20. Reference :
• Anatomy descriptive and surgical (henry gray)