L8 Flashcards
What is the nerve supply of the posterior forearm?
Posterior interosseus nerve, from deep branch of the radial nerve
Deep branch of radial nerve - posterior interosseous nerve
Winds around the neck of radius pierces the 2 heads of supinator to become the (P) interosseus nerve.
Where is the blood supply for the posterior compartment of forearm from?
Posterior interosseus artery
What is the posterior interosseus artery? (from)
A branch of the common interosseous from the ulnar artery
What is the posterior compartment blood supply reinforced by?
Perforating branches of anterior interroseus artery
What are the muscles on the radial/lateral side of the posterior forearm?
- Brachioradialis
- Ext. Carpi Radialis Longus
- Brevis
What are the muscles on the middle and ulna side of the posterior forearm?
- Ext. Digitorum,
- Ext. Digiti Minimi
- Ext. Carpi Ulnaris
What tendons of thumb muscles form the anatomical snuffbox?
- Abductor Policis Longus
- Extensor Policis Brevis
- Extensor Policis Longus
What is the insertion of brachioradialis?
Base of styloid process of radius
What is the origin of brachioradialis?
Upper 2/3 of (L) supracondylar ridge of humerus
What muscle forms the lateral border of the cubital fossa?
Brachioradialis
Give the clinical for brachioradialis
Can be transplanted into flexor pollicis longus to produce flexion of the thumb in median nerve palsy
Test for damage to brachioradialis?
Place forearm in midprone position and flex against resistance while palpating the muscle belly.
What is the nerve supply for brachioradialis?
Branch of Radial nerve (C5,C6) arising above elbow
What is the action of brachioradialis?
Pulls on radial styloid process flexing at forearm. Ulna follows passively falling into the midprone position weak pronating
What is the course of the brachioradialis?
- Forms (L) border of the cubital fossa - along preaxial border of the forearm - overlies radial nerve & artery as they lie on: Supinator / Pronator Teres tendon / FDS & FPL
What is the lower part of the tendon of brachioradialis overlaid by?
- Abductor policis longus
- Extensor policis brevis
What are the actions of the extensor carpi radialis longus?
Extensor & radial abductor of the wrist - important as a synergist enabling finger flexors to produce a grip.
Test of carpi radialis longus
Pronate forearm & extend the wrist then abduct against resistance palpate muscle belly (L) side of elbow & tendon proximal to anatomical snuffbox.
What is the origin of extensor carpi radialis longus?
Lower 2/3 lateral supracondylar ridge of humerus
What is the insertion of extensor carpi radialis longus?
base of 2nd metacarpophalangeal
What is the action of extensor carpi radialis longus?
Extensor & radial abductor of the wrist - important as a synergist enabling finger flexors to produce a grip.
What is the course of extensor carpi radialis longus?
Behind brachioradialis - beneath deep outcropping thumb muscles - across floor of anatomical snuffbox
What is the nerve supply of extensor carpi radialis longus?
Branch of radial nerve (C6,C7) arising above the elbow.