WEEK 4 Flashcards
(13 cards)
MUSCLES OF THE THENAR EMINENCE - BULGE UNDER THE THUMB
- Abductor pollicis brevis.
- Flexor pollicis brevis.
- Opponens pollicis.
MUSCLES OF THE HYPOTHENAR EMINENCE - BULGE UNDERNEATH THE LITTLE FINGER
- Flexor digiti minimi
- Abductor digiti minimi
- Opponens digiti minimi
Extensor retinaculum
Strap tendons down to the bone
Attachments of extensor retinaculum
- Radius
- Ulna
- Pisiform
- Triquetrum
- Ulnar collateral ligament
Flexor retinaculum
Prevent bowstring, protect underlying structures
Attachments of Flexor retinaculum
Scaphoid and trapezium to pisiform and hamate
Palmar aponeurosis
Triangular shaped sheet of fascia, extends from the flexor retinaculum to the deep transverse metacarpal ligaments
Protects underlying vessels and nerves
Anchors the skin to prevent in sliding around
Aids grip
Dorsal digital expansion
Layer of connective issue
Forms an aponeurosis over the posterior surface of each finger
Receives attachment from – ED, lumbricals, interossei
Ensures simultaneous extension of the interphalangeal joints in each finger when releasing grip
Intertendinous connections
Bands of connective tissue that connect the extensor tendons in the back of the hand
Prevents independent extension of any one finger, ensures hand opens as a unit when releasing grip
Synovial flexor sheaths
Tube for the tendons to run in
Function: allows friction free gliding of the tendon under the fibrous sheath
Digital sweep
Describes the path taken by the finger tips as the hand closes
Desirable to have a long path so that the fingertips make the largest arc possible – allows grip of large objects
4 power grips
- Hook
- Cylidrical
- Lateral prehension
- Spherical
3 precision grips
- Lateral pinch
- Pincer
- Pad to pad
- Lumbrical grip
