The musculocutaneous nerve pierces the coracobrachialis muscle and supplies it with innervation.
radial nerve
Axillary nerve supplies the deltoid and the teres minor mucsles. So you wouldn't be able to abduct your arm otherwise. It is also the lateral cord of the brachial plexus.
Its sensory distribution is the skin overlying the deltoid muscle.
The axillary nerve, which orginates from root C7 of the brachial plexus, innervates the deltoid . The radial nerve also orginates off the same cord. So, it may be linked to your cervical spine, or the deltoid muscle compressing the nerve.
ulnar nerve
deep peroneal nerve supplies the tibialis anterior muscle
Brachial plexus thru axillary nerve
The deltoid muscle is located around the shoulder at the top. There is a deltoid muscle that is located on each shoulder.
The axillary nerve, which arises from the brachial plexus, is primarily responsible for innervating the deltoid muscle. It provides motor innervation to the deltoid muscle, controlling its function of shoulder abduction.
A deltoid muscle is the muscle that forms the rounded part of the shoulder.
Intramuscular (IM) injections are typically given in one of three muscles. These muscles are the vastus lateralis, or thigh muscle, the ventrogluteal, or hip muscle, and the deltoid, or upper arm muscle.