Bones of the hand Flashcards
What are all the carpal bones of the hand?
Scaphoid lunate triquetrium pisiform trapezieum trapezoid capate hamate
Which bone articulate with proximal carpals?
the radius
ulna do not articulate
How is the radius attached to the ulna?
triangular cartilage
it is an articulating disk
How is force generated at the hand to the ulna?
from the proximal carpals through a articulating disk to the ulna
What are the proximal carpals from lateral to medial?
Scaphoid
lunate
triquetrium /pisiform
What does the pisiform articulate with?
only articulates with the triquetrium is not an integral part of the proximal row
What does some clinicians refer the scaphoid bone as?
the navicular
What are the distal row carpals from lateral to medial?
Trapezium
trapezoid
capitate
hamate
What bone does the trapezium has a separate saddle joint articulation?
first metacarpal
Which distal row metacarpal is centerline of hand?
capitate
Which muscle is the hamate attached and how?
flexor retinaculum
it is attached by a hook (hamulus)
What does the base of the Metacarpals articulate with?
distal carpal bones
What does the head of the metacarpals articulate with?
proximal phalanges
Where is the motion in the carpometacarpal joint?
articulations with the base of metacarpals and distal carpals
little motion for digits 2-5
What permits movement in all three planes?
the carpometacarpal joint of digit 1 is a saddle joint
What are the phalanges for digit 1?
two
proximal and distal
What does the Metacarpophalageal joint allow for in digit 2-5?
flexion/extension
abduction and adduction is present but limited in flexion
What are the phalanges of 2-5?
proximal
middle
distal
What does the two interphalgeal joints of digits 2-5 only allow for?
flexion and extension
What allows for supination and pronation at the radioulnar joint?
The triangular fibrocartilage and associated ligaments
What are the hand joints?
radiocarpal intercarpal common carpometacarpal (2-5) first carpometacarpal interphalageal joints
Which digit has the greatest range of motion?
5th digit
What does flexion of the wrist of the wrist require?
both radiaocarpal and inter carpal joints
60% intercarpal 40% radio carpal
What does extension of he wrist require?
60% radiocarpal 40%intercarpal
What does adduction and abduction of the wrist require?
rotation of scaphoid and lunate
scaphoid and triqoetrium around a central axis
