Anatomy Arm - Muscles of Arm: Posterior Views, N420

Nerves:

1. Axillary Nerve and the Posterior Circumflex Humeral Artery through the quadrangular space.
1. Axillary Nerve gives off the Superior Lateral Brachial Cutaneous Nerve
1.  Posterior Circumflex Humeral Artery has its ascending and descending branches. 
2. Descending branch Posterior Circumflex Humeral Artery anastomosis with the Profunda Brachii Artery that accompanies the Radial Nerve deep to the Lateral head of the triceps Brachii Muscle. 
2. Radial Nerve 
1. Branches to the Long Head of Triceps, Lateral Head of Triceps and the deep Medial Head of Triceps. The Nerve to Aconeus Muscle and the Medial Head of Triceps Brachii
2. Interior Lateral Brachial Cutaneous Branch and the Posterior antebrachial Cutaneous Nerve - LBC and the PABC
3. Ulnar Nerve posterior to the Medial Epicondyl 

Muscles

1. Supraspinatus, Infraspinatus, Teres Minor Muscle and (Subscapularis) SITS
2. V formed by the Lateral Head of the Triceps over the Humerus and the Long head of the Triceps. 
1. The Triangular space with the Profunda Brachii Artery and the Radial Nerve are inferior to the Teres Major Muscle.
2. The Quadrangular Space with the Axillary Artery and the Posterior Circumflex Artery Emerge is superior to Teres Major
3. Medial Head of Triceps Brachii can only be seen if the Lateral Head of Triceps Brachii is Cut
4. Lateral intermuscular septum that covers the Radial Collateral Artery and the Radial Nerve

Bones and Ligaments

1. Capsule of Glenohumeral Joint, Supraspinatus Tendon
2. Lateral Epicondyl and the Olecronon of the Ulna are attachments for the Aconeus Muscle

Anatomy Arm - Muscles of Arm: Anterior Views, N419

After removing the coverings of the deltoid and the Underlying Pectoralis Major Muscle that wraps the anterior shoulder -

1. The V of the Biceps Brachii with the 
1. long head in the  intertubercular groove; it is retained in the groove by the transverse humeral ligament
2. The Short head of the Biceps Brachii and the Coracobrachialis Muscles arise from the Coracoid.

NERVES:

1. Musculocutaneous nerve pierces the Coracobrachialis and also supplies Biceps Brachii and the Brachialis Muscle terminating in the Lateral Antebrachial Cutaneous Nerve. The Lateral Antebrachial Cutaneous Nerve emerges between  Biceps Brachii Muscle and the Brachialis Muscle.
2. Median Nerve with the cut Brachial Artery anterior to the medial epicondyl - deep to the Bicipital Aponeurosis
3. Ulnar Nerve is posterior to this - Posterior View

Bones

1. Relation of the Greater and Lesser Turbercle of the Humerus and the Subacromial Bursa and the Acromion and Coracoid process of the Scapula
2. The suprascapular ligament and the superior scapular artery
3.   

Bones

FIG. 411– Deep muscles of the chest and front of the arm, with the boundaries of the axilla.

FIG. 809– The right brachial plexus (infraclavicular portion) in the axillary fossa; viewed from below and in front. The Pectoralis major and minor muscles have been in large part removed; their attachments have been reflected. (Spalteholz.)

FIG. 810– Suprascapular and axillary nerves of right side, seen from behind. (Testut.)

FIG. 816– Nerves of the left upper extremity.

FIG. 817– Deep palmar nerves. (Testut.)