A&F Flashcards
What are the muscles of the anterior arm?
biceps brachii
coracobrachilais
brachialis
What nerve supplies the anterior arm?
musculocutaneous n.
C5, 6, 7
What nerve pierces coracobrachialis?
musculocutaneous n.
C5, 6, 7
What muscles are in the posterior arm?
triceps brachii
What nerve supplies the posterior arm?
radial n.
C5, 6, 7, 8, T1
What are the two muscles involved in pronation?
pronator teres m.
pronator quadratus m.
What muscle comes around the lateral edge of the forearm so that its kind of looks like its in anterior and posterior compartments but is actually posterior?
brachioradialis m.
What are the associated function of the anterior compartment of the forearm?
wrist movements
flexion of digits and thumb
pronation
How many layers does the anterior forearm have?
3 layers:
superficial (4)
Intermediate (1)
deep (3)
What nerve(s) supply the anterior forearm?
Median (mostly median) and ulnar n.
C6, 7, 8, T1
What are the muscles of the anterior forearm, from medial to lateral?
Flexor carpi ulnaris
palmaris longus
flexor carpi radialis
pronator teres
What nerve passes through the two heads of flexor carpi ulnaris?
ulnar n.
C8 - T1
What nerve passes through the two heads of the pronator teres m?
median n.
C6, 7, 8, T1
What nerve is messed up when you have pronator syndrome?
median n.
C6, 7, 8, T1
What is the intermediate muscle of the anterior forearm?
flexor digitorum superficialis
What are the deep muscles of the anterior forearm from medial to lateral?
flexor digitorum profundus
flexor pollicus longus
pronator quadratus
What creates the carpal tunnel?
flexor retinaculum
How many layers does the posterior forearm have?
2 layers:
superficial (7)
deep (5)
What are the movements associated with the posterior forearm?
movement of wrist
extension of fingers and thumb
supination
What nerve is associated with the superficial muscles of the posterior forearm?
radial n.
C5, 6, 7, 8
What are the muscles of the superficial posterior forearm from lateral to medial?
brachioradialis extensor carpi radialis longus extensor carpi radialis brevis extensor digitorum extensor digiti minimi extensor carpi ulnaris anconeus
What nerve is associated with the muscles of the deep posterior forearm?
posterior interosseus n.
What are the muscles of the deep posterior forearm from lateral to medial?
supinator abductor pollicus longus extensor pollicus brevis extensor pollicus longus extensor indicis
What is the path of the musculocutaneous n.?
- pierces coracobrachialis and supplies it
- continues into biceps (supplies all of this) and brachialis (supplies half of this)
- emerges between biceps/brachialis as lateral antebrachial cutaneous n.
- supplies skin of lateral forearm
What is the path of the median n.?
- runs down medial aspect of arm lateral to brachial a.
- crosses over brachial a. to medial side, enters cubital fossa
- runs between flexor digitorum superficialis and profundus
- supplies most muscles of anterior forearm
- continues under carpal tunnel to supply lateral hand through the palmar branch
Why is the palmar branch of the median n. important?
If you have carpal tunnel syndrome, your palmar branch is unaffected–maintain sensation in lateral hand
What is the path of the ulnar n.?
- travels posteriorly down medial aspect of arm
- runs in cubital tunnel between medial epicondyle and olecranon (funny bone)
- dives into medial forearm (with ulnar a.) to supply it
- continues over carpal tunnel to supply medial and deep hand
What is the path of the radial n.?
- runs with deep brachial a. in radial groove of humerus (emerges from triangular interval)
- continues between brachialis and brachioradialis
- supplies all of triceps brachii and lateral brachialis
- divides into superficial (skin on back of hand) and deep (posterior mm. of forearm) branches
What is the path of the brachial a.?
- direct continuation of axillary a., becomes brachial at inferior border of teres major
- splits into radial and ulnar aa.
(also sends of deep brachial a. before bifurcation)
- sends off superior and inferior ulnar collateral aa.
