GROSS ANATOMY

Detailed explanation-1: -The teres minor is innervated by the axillary nerve and supplied, in part, by the posterior humeral circumflex artery. Therefore, quadrangular space syndrome can result in selective atrophy of the teres minor, vague shoulder pain, and paresthesia.

Detailed explanation-2: -Innervation. Teres minor shares its innervation with the deltoid muscle; this is supplied by the axillary nerve (C5, C6), which stems from the posterior cord of brachial plexus.

Detailed explanation-3: -Axillary nerve (ventral rami of C5 & C6) arises from the posterior cord of brachial plexus giving muscular branches to teres minor & deltoid. It also supplies the shoulder joint and the skin over it [1].

Detailed explanation-4: -The posterior branch of the axillary nerve innervates the teres minor and also the deltoid. The posterior branch then winds round the deltoid muscle and goes to innervate an area of skin on the back of the arm as the upper lateral brachial cutaneous nerve, or the superior lateral cutaneous nerve of arm.

Detailed explanation-5: -Function. The axillary nerve supplies two muscles in the arm: deltoid (a muscle of the shoulder) and teres minor (one of the rotator cuff muscles). The axillary nerve also carries sensory information from the shoulder joint.