The posterior cutaneous nerve of forearm
is a nerve
found in humans and other animals. It is also known as the dorsal antebrachial cutaneous nerve
, the external cutaneous branch of the musculospiral nerve
, and the posterior antebrachial cutaneous nerve
. It is a cutaneous nerve
(a nerve that supplies skin) of the forearm
It arises from the radial nerve
in the posterior compartment of the arm, often along with the posterior cutaneous nerve of the arm.
It perforates the lateral head of the triceps brachii
muscle at the triceps' attachment to the humerus
The upper and smaller branch of the nerve passes to the front of the elbow
, lying close to the cephalic vein
, and supplies the skin of the lower half of the arm.
The lower branch pierces the deep fascia
below the insertion of the Deltoideus
, and descends along the lateral side of the arm and elbow, and then along the back of the forearm to the wrist, supplying the skin in its course, and joining, near its termination, with the dorsal branch of the lateral antibrachial cutaneous nerve.
Image:Gray413_color.png|Cross-section through the middle of upper arm.
Image:Gray811and813.PNG|Cutaneous nerves of right upper extremity.