Hand Flashcards
which parts of the radius are concave?
M-L and A-P
where is lister’s tubercle?
radius
degree of ulnar tilt of radius
25º
degree of palmar tilt of radius
10º
the difference between lengths of radius and ulna
ulnar variance
when is ulnar difference value deemed abnormal?
when >1 mm difference
pronation = functional __________ of radius
shortening
supination = functional _________ of radius
lengthening
ulnar positive/negative
+: ulna is longer than radius
-: distal ulna is shorter than radius
most unstable carpal bone
lunate
sesamoid bone of hand
pisiform
largest carpal bone
capitate
this carpal bone articulates with the 1st MC
trapezium
this carpal bone articulates with the 2nd MC
trapezoid
describe the shape and components of carpal tunnel in respect to carpal bones/ligs
palmar concavity of carpal bones + transverse carpal lig
components of radiocarpal joint
concave radius/articular disc, convex scaphoid and lunate
components of medial midcarpal joint
convex capitate/hamate
concave scaphoid/lunate/triquetrum
components of lateral midcarpal joint
concave trapezium/trapezoid
convex scaphoid
two main roles of hand ligs
- maintain alignment
2. disperse forces
wrist extension occurs with this movement
radial deviation
wrist flexion occurs with this movement
ulnar deviation
AOR of wrist
capitate
explain the central column
simplified model for arthrokinematics
radius - lunate - capitate - third MC
entire midcarpal joint represented by what happens between….
lunate and capitate
entire radiocarpal joint represented by the movement between…
lunate and radius
arthrokin at radiocarpal joint
convex carpal on concave radius
roll and glide in opposite direction in open chain
movement at midcarpal joint is considered as….
one unit
in respect to arthrokin, a segment moves and rolls in the ____ direction
same
secondary extensors have a critical role in…
positioning wrist for grip
long finger flexors create these two movements
finger flexion + wrist flexion
max effort grip wrist extension angle
30º
which deviators are stronger?
radial
3 functions of hand
- sensory
- effector
- emotional communicator
define ray
one MC bone and its associated phalanges
hand is _____ on palmar side. why?
concave - allows tendons to reside here
1st MC rotated __________
90º medially