10 Flashcards
What is the structure of the skeleton of the hand?
The hand skeleton consists of carpals in the wrist, metacarpals in the hand proper, and phalanges in the fingers (digits). The digits are numbered one to five, starting with the thumb.
What defines the thenar and hypothenar eminences in the hand?
The thenar eminence, located at the base of the thumb, is a larger and more prominent mound, while the hypothenar eminence is smaller and located at the base of the little finger.
What is the power grip, and which muscles are involved?
The power grip is a forcible motion of the digits against the palm, with the thumb providing counterpressure. It involves long flexor muscles for the digits, intrinsic palm muscles, and wrist extensors to “cock” the wrist for a stronger grip.
Describe the hook grip and its primary use.
The hook grip involves flexing the long flexor muscles to hold an object like a briefcase with minimal energy consumption, depending on the object’s size.
What is the precision handling grip?
The precision handling grip allows fine control of digit movements for tasks like holding a pencil or threading a needle, relying on wrist and digits stability by long flexor and extensor muscles and fine movements of digits by intrinsic hand muscles.
