Gross Anatomy - Brachial Plexus

-Ventral Ramus of C5 (sometimes C4)

-Pierce scalenus medius , descends to levator scapulae and enters rhomboids

-Rhomboids (occasionally levator scapulae)

-C5 through C7

-Descends to C8 and T1 then passes serratus anterior

-Serratus Anterior

- C5 and C6 ( sometimes C4)

-descends between posterior to clavicle and anterior to brachial plexus and subclavian artery

-subclavius and subclavicular joint

- C5 and C6 ( often C4)

-passes laterally over posterior triangle into subscapular notch under scapular ligament 

-Supraspinatus , Infraspinatus

- Lateral Cord C5 though C7

-Pierces clavipectoral fascia to pectoral muscles

-Pectoralis Major primarily and secondary loop to pectoralis minor

-Lateral cord C5-C7

-enters coracobrachialis and descends between biceps brachii and brachialis 

-Coracobrachialis , biceps brachii , brachialis , lateral antebrachial cutaneous nerve

- C5 through T1

-Lateral root and medial root join to make median , which is lateral to axillary artery

-flexor muscles of forearm , (except flexor carpi ulnaris and ulnar half of flexor digitorum profundus ) and five hand muscles

-C8 and T1

- through axillary artery and vein to deep pectoralis major

-Pectoralis minor and part pectoralis major

- C8 to T1

-medial side of axillary vein and communicates with intercostobrachial nerve

-skin medial side of arm

-C8 and T1

- between axillary artery and vein 

-skin of medial forarm

- C8 to T1 ( sometimes C7)

-medial aspect of arm runs posterior to medial epicondyle to enter forearm

- 1 (1/2) of the flexor muscles of forearm , small muscles in hand skin on hand medial to 4th digit

- Posterior branch C5 and C6

-passes posteriorly enters subscapularis

-superior subscapularis

-Posterior branch C5 to C6 

-between upper and lower subscapularis nerves and then runs down axillary wall to latissimus dorsi

-Latissumus dorsi

- Posterior C5 and C6

-inferiolaterally deep to subscapular artery and vein  to subscapularis and teres major

-inferior subscapularis and teres major

- Terminal branch posterior C5 and C6

- passes quadrangular space with posterior circumflex humeral artery then around surgical neck of humerus then turns into lateral brachial cutaneous nerve

-Teres Minor , Deltoid , shoulder joint , skin of inferior deltoid

- C5 to T1

-posterior to axillary artery , then radial groove with deep brachial artery , then pass between long and medial head of triceps

-Triceps brachii , aconeous , brachioradialis , extensor muscles forearm , skin posterior portion of arm