Muscular Branches Of The Axillary

The muscular branches of the axillary nerve are peripheral nerve branches that arise from the axillary nerve, which is a major nerve in the upper limb. These branches innervate specific muscles in the shoulder region, playing a crucial role in motor function and movement of the shoulder joint. Superior lateral cutaneous nerve of the arm: This is a sensory branch of the axillary nerve rather than a muscular branch. It provides sensory innervation to the skin on the lateral aspect of the upper arm. Anterior branch: The anterior branch of the axillary nerve supplies motor innervation to the deltoid muscle. The deltoid is a large muscle that forms the rounded contour of the shoulder. It is the primary muscle responsible for abduction of the arm at the shoulder joint. Posterior branch: The posterior branch of the axillary nerve supplies motor innervation to the teres minor muscle. The teres minor is a small muscle located on the posterior aspect of the shoulder. It contributes to the stability and external rotation of the shoulder joint. The muscular branches of the axillary nerve are essential for the coordinated movement and stability of the shoulder joint. The anterior branch innervates the deltoid muscle, allowing for abduction and lifting of the arm away from the body. The posterior branch innervates the teres minor muscle, assisting in external rotation and providing support to the shoulder joint.

Axillary

The brachial plexus is formed by the ventral rami of c5-c8-t1 spinal nerves, and lower and upper halves of c4 and t2 spinal nerves. the plexus extends toward the armpit. the ventral rami of c5 and c6 form upper trunk, the ventral ramus of c7 forms the middle trunk, and the ventral rami of c8 and t1 join to form the lower trunk of the brachial plexus. under the clavicle, the trunks reorganize to form cords (fasciculi) around the axillary artery (arteria axillaris). the lateral cord (fasciculus lateralis) is formed by the upper and middle trunk, all three trunks join to form the posterior cord (fasciculus posterior), the lower trunk continues to the medial trunk (fasciculus medialis). the nerves (containing motor and sensory fibers) to the shoulder and to the upper limb emerge from the brachial plexus.