Dorsal Scapular- Rhomboids and Levator Scapulae (C5)

Nerve to Subclavius- Subclavius 

Long Thoracic- Serratus Anterior (C5-7)

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Suprascapular- Supraspinatus/Infraspinatus (C5-6)

Nerve 2 Subclavius- Subclavius (C5-C6)

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Lateral Pectoral (C5-7)- innervates the pec major primarily and partially pec minor

Accompanies the thorcoacromial artery

Musculocutaneous Nerve (C5-7)- innervates the biceps brachii, brachialis and corocobrachialis

Pierces the corochobrachialis

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Medial Pectoral Nerve (C8-T1)- Supplies the pec minor and reaches the overlying pec major

Medial Brachial Cutaneous Nerve (C8-T1) - innervates the skin on the medial side of the arm

Medial Antebrachial Cutaneous (C8-T1)- innervates the medial side of the forearm

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Median Nerve (C5-T1) -formed from the 2 heads of the medial and lateral cords and runs anteromedial of the arm not branching

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Branches from the Posterior Cord?

Upper Subscapular (C5-C6)- innervates the upper portion of the subscapularis

Thoracodorsal Nerve (C7-8)- runs along the thoracodorsal artery to enter the latissimus dorsi

Lower Subscapular (C5-6)- innervates the lower subscapularis and the teres major

Axillary (C5-6)- innervates the deltoid, teres minor 

Passes through the quadrangular space accompainied by the posterior circumflex artery and wraps around the surgical neck

Radial Nerve (C5-T1)- occupies the musculospiral groove with the profunda brachii

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Caused by the pressure of the crutch piece, resulting in paralysis of the arm called crutch palsy. Results in loss in function of the extensors of the arm,forearm, and hand and produces a wrist drop

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caused by the fracture of the surgical neck of the humerus. Results in the weakness of lateral rotation and abduction of the arm

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caused by a mid-shaft fracture of the humerus resulting in the loss of the extensors in arm, forearm, hand causing wrist drop 

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descends down the biceps brachii and brachialis. Innervates all of the flexor muscles such as coracobrachialis, biceps, and brachialis muscles. Continues into forearm as the latereal antebrachial cutaneous nerve.

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results in weakness of supination (biceps) and flexion(biceps and brachialis) of forearm and loss of sensation of lateral side of forearm

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Anterior interosseous Nerve- starts in the cubital fossa just below the bicepital aponeurous. Supplies the pronator quadratus, flexor pollicis longus, flexor digitorium profundus

Palmar branch of median nerve- Superficial to the flexor reticulinum . Provides sensation to the lateral side of the hand

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Caused by supracondylar fracture of the humerus or compression in the carpal tunnel. results in loss of pronation,opposition of the thumb. Ape hand

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descends posteriorly with the profunda brachii artery in the spiral groove on the back of the humerus. descends along the lateral epicondyle to enter cubital fossa splitting into two branches 

Deep Branch- emerges from the supinator as the posterior interosseous nerve and continues with posterior interosseous artery

Superficial Branch- branches in the brachioradialis, runs superficially to innervate the radial side of forearm, provides sensation to radial half of hand

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arises from the medial cord of brachial plexus, descends with the superior ulnar collateral artery. descends behind the medial epicondyle into the cubital tunnel. innervates the medial half flexor digitorium and flexor ulnaris. Enters hand through the guyons canal, space btw flexor reticulum and and pisiform

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caused by the fracture of the medial epicondyle and results in the claw hand.  The hand will show hyper-extension of the metacarpophalangeal joints (MCP) and flexion at the distal and proximal Interphalangeal (IP) joints of the 4th and 5th digits (ring and little finger).^[5] The clawing will become most obvious when the person is asked to straighten their fingers.Patients exhibiting an ulnar claw are also very frequently unable to spread (abduct) or pull together (adduct) the fingers against resistance. This occurs because the ulnar nerve also innervates thepalmar and dorsal interossei of the hand.

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Superficial Branch- innervates the palmaris brevis, hypothenar eminence. terminates into 3 palmar digital branches

Deep Branch- curves medial to the hook of hamate then turns lateraly toward palm center

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Injury to the musculocutaneous nerve in the axilla (uncommon in this protected position) is typically inflicted by a weapon such as a knife.

A musculocutaneous nerve injury results in paralysis of the coracobrachialis, biceps, and brachialis.

Consequently, flexion of the elbow joint and supination of the forearm are greatly weakened but not lost.

Weak flexion and supination are still possible, produced by the brachioradialis and supinator, respectively, both of which are supplied by the radial nerve

Loss of sensation may occur on the lateral surface of the forearm supplied by the lateral antebrachial cutaneous nerve, the continuation of the musculocutaneous nerve.

Injury to the radial nerve superior to the origin of its branches to the triceps brachii results in paralysis of the triceps, brachioradialis, supinator, and extensor muscles of the wrist and fingers.

When the nerve is injured in the radial groove, the triceps is usually not completely paralyzed but only weakened because only the medial head is affected

The characteristic clinical sign of radial nerve injury is wrist-drop

two main superficial veins of the arm, the cephalic and basilic veins

brachial vein, accompany the brachial artery

Aaccompanying veins of the ulnar and radial arteries and end by merging with the basilic vein to form the axillary vein

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