Posterior Forearm, Knee and Ankle Joints Flashcards
What is the action and innervation of Brachioradialis?
Action: Flexion of elbow Radial Nerve (c5-T1)
Name the superficial muscles of the posterior compartment of the forearm.
- Extensor carpi radialis brevis.
- Extensor carpi radialis longus.
- Extensor carpi ulnaris.
- Extensor digiti minimi.
- Extensor digitorum.
- Brachioradialis - flexor but has all the characteristics of an extensor.
What nerve innervates muscles of posterior forearm?
Radial Nerve
Function: Extension at wrist and fingers
What muscles originate from lateral epicondyle?
1) Extensor carpi radialis brevis
2) Extensor digitorum
3) Extensor digiti minimi
4) Extensor carpi ulnaris
What is the action and insertion of extensor carpi radialis?
Metacarpal bones 2&3
Extension and ABduction of the wrist
What is the action of extensor digitorum?
Extension of medial four fingers at MCP and IP joints
What is the action of extensor carpi ulnaris?
Extension and adduction of the wrist
What are the deep muscles of posterior forearm compartment?
1) Supinator
2) Abductor pollicis longus
3) Extensor pollicis longus.
4. Extensor pollicis brevis.
5. Extensor indicis.
What are the origins of 2 heads of supinator?
1) Lateral epicondyle of humerus
2) posterior surface of ulna
What is the action of extensor pollicis brevis?
Extension at the metacarpophalangeal and interphalangeal joints of the thumb.
What is the action of extensor pollicis longus?
Extends all the joints of the thumb.
What are the borders of wall of anatomical snuffbox?
1) Medial: Extensor pollicis longus
2) lateral: Extensor pollicis brevis and abductor pollicis longus
Action of extensor pollicis longus?
Extension of all joints of thumb
Action of extensor indicis?
Allows index to be independent of other fingers in extension
Which artery, nerve and veins pass through the anatomical snuffbox?
Radial Artery,
Radial Nerve branch
Cephalic Vein
