The Hand - the shorter intrinsic muscles adequate sensory...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
The Hand Each finger is composed of a "Ray." A "Ray" is comprised of: o one metacarpal o three phalanges (two in the thumb) The bones of the hand are arranged in three arches o two transverse arches o one longitudinal arch Stability and Control The stability and control of the hand is governed by three factors: 1. the co-ordinated actions of extrinsic (from outside of hand) and intrinsic hand muscles 2. the dorsal tendinous complex (called extensor assembly) contributes to stability and control 3. the flexor tendon sheath pulley system allows smooth and stable flexion Patterns of Hand Function Prehensile movements. The term prehensile means "adapted for grasping or seizing" o the object is held partly or wholly within the compass of the hand o this depends on: the mobility of the carpometacarpal joint of the thumb the relative rigidity of the 2 nd and 3 rd carpometacarpal joints the stability of the longitudinal arch the balanced synergism and antagonism between the long extrinsic and
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: the shorter intrinsic muscles adequate sensory input from all areas of the hand Classifications of Hand Function - Power & Precision Grip Power grip o gross control o forceful act o thumb is positioned opposite the fingers o hand deviated ulnarly Precision grip- better called precision handling o fine control o much less force than power grip o thumb is opposite the fingers o hand is way between ulnar and radial deviation o wrist is markedly flexed Both types of grips play a role in all grasping actions, but one or the other usually predominates o examples: power grip - grabbing a hammer, making a fist intermediate grip which involves elements of both power and precision holding a golf club, baseball bat or fencing foil precision grip writing action, use of scissors these are known as a "dynamic tripod"...
View Full Document

Page1 / 6

The Hand - the shorter intrinsic muscles adequate sensory...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online