Hand Flashcards
What lives in the ulnar notch of the radius to ulnar styloid and separates the ulnar head from carpals while sliding across ulnar head during pronation/supination?
Triangular Fibrocartilage (TFC)
What are the 4 proximal carpals?
Scaphoid, lunate, triquetrum, pisiform
What are the 4 distal carpals?
Trapezium, trapezoid, capitate, hamate
Describe the scaphoid
Largest proximal carpal, most frequently fractured
Describe the lunate
Most common dislocated
Describe the triquetrum
Connects to the triangular fibrocartilage
Describe the pisiform
Embedded in flexor carpi ulnaris tendon
Describe the trapezium
Thumb side
Describe the trapezoid
Connects to second metacarpal
Describe the capitate
Largest of all carpal bones
Describe the hamate
Hook projects anteriorly
Radius + proximal carpals
Radiocarpal joint
Proximal row of carpals+distal row of carpals
Midcarpal joint
Distal carpal + metacarpals
Carpometacarpal (CMC) joints
What is special about the first CMC joint?
It is a saddle joint, allowing the thumb a wide range of movement
Metacarpals + proximal phalanges
Metacarpophalangeal joints
Proximal phalanx + middle phalanx
Proximal Interphalangeal Joints (PIP)
Middle phalanx + distal phalanx
Distal Interphalangeal Joints (DIP)
Does the thumb have PIP or DIP joints?
No, only IP joint
What 4 ligaments surround the wrist?
Palmar radiocarpal, dorsal radiocarpal, ulnar collateral, radial collateral
What is the job for palmar and dorsal radiocarpal?
Keep hand connected to radius (allows hand to rotate with radius when pronating/supinating)
What is the jobs of ulnar and radial collateral?
RC= Strengthen medial parts of joint capsule; UC= Strengthen lateral parts of joint capsule
Where do the palmar and dorsal radiocarpal attach to?
Radius to both rows of carpals
Where does the ulnar collateral attach to?
Ulna to the triquetrum