Nerves
On the upper arm some nerves run from the brachial plexus. The musculocutaneous nerve originates from the lateral part of the plexus and supplies the motor nerve. The radial nerve runs together with the brachial artery and wraps around the humerus.
The radial nerve innervates the forearm and splits into different branches and then innervates parts of the forearm. The median nerve originates from the lateral part of the plexus and branches out into a medial nerve. It runs in the medial bicuspid sulcus to the elbow and from there between the muscles of the forearm to the wrist.
The ulnar nerve comes from the middle branch of the plexus and runs relatively straight along the elbow side of the arm. However, it alternates in between and thus runs About in the middle of the upper arm, the nerve penetrates the muscles and thus reaches the back. There the nervus ulnaris runs in a canal, which makes it particularly easy to stimulate at the elbow (funny bone).
It then returns to the flexor side and innervates numerous muscles of the forearm. The sensitive supply area of the upper arm is difficult to divide. Four areas are distinguished, which are supplied by different nerves.
- Musculus coracobrachialis
- Musculus biceps brachii
- Brachial Musculus
- Triceps muscle and pulls up to the crook of the arm.
- Lateral and one
- Medium share.
- Times on the stretching side and
- Times on the flexor side of the arm.
- The middle area on the inside of the upper arm is supplied by the nervus cutaneus brachii medialis (from the middle part of the plexus).
- The lateral area is innervated near the body by the nervus cutaneus brachii laterlis superior (from the axillary nerve),
- The part of the nerve cutaneus brachii lateralis inferior (from the radial nerve).
- The posterior area is very small and is supplied by the nervus cutaneus brachii posterior, also originating from the nervus radialis.
