The brachial plexus, specifically the axillary branch of the posterior cord of the brachial plexus.
It will hurt really bad if you punch it hard.
I sudden blow to the abdomen that applies pressure to the solar plexus can cause momentary paralysis of the diaphragm (the muscle that makes you breathe). It takes a few seconds for the diaphragm to relax so breathing can resume as normal.
Brachial plexus thru axillary nerve
Submucosal nerve plexus and myenteric nerve plexus
Axillary nerve C5 and C6, a branch of the posterior chord of the brachial plexus
The deltoid is innervated by the axillary nerve which originates from the ventral rami of the C5 and C6 spinal nerves, via the superior trunk, posterior division of the superior trunk, and the posterior cord of the brachial plexus.
The Ulnar nerve is located in the joint of the elbow. It is the largest unprotected nerve in the human body, therefore injuries are very common. It is also commonly referred to as the "Funny Bone".
The nerve that control the larynx during breathing is the Vagus Nerve.
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.
A plexus is a branching network of axons outside of the central nervous system. The four primary nerve plexuses are the cervical plexus, brachial plexus, lumbar plexus, and the sacral plexus. The choroid plexus is a part of central nervous system in the brain and it consist of capillaries, ventricles and ependymal cells. source of this information : Wikipedia.
The brachial plexus is a network of nerves fibers that connects the arm to the spinal cord. Injury of it could cause the arm to be paralyzed, a lack of muscle control, and/or a lack of sensation.
Cervical Plexus Brachial Plexus Lumbar Plexus Sacral Plexus
The myenteric plexus (Auerbach plexus) and the submucosal plexus (Meissner plexus). Together, they are collectively known as the Intramural plexus.
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.