Medial cutaneous nerve of forearm
Encyclopedia
The Medial Antebrachial Cutaneous Nerve (internal cutaneous nerve, medial cutaneous nerve of forearm) arises from the medial cord
of the brachial plexus
.
It derives its fibers from the eighth cervical and first thoracic nerves, and at its commencement is placed medial to the axillary artery
.
It gives off, near the axilla, a filament, which pierces the fascia and supplies the integument covering the Biceps brachii, nearly as far as the elbow.
The nerve then runs down the ulnar side of the arm medial to the brachial artery
, pierces the deep fascia with the basilic vein
, about the middle of the arm, and divides into a volar and an ulnar branch.
It then descends on the front of the ulnar side of the forearm, distributing filaments to the skin as far as the wrist, and communicating with the palmar cutaneous branch of the ulnar nerve.
, in front of the medial epicondyle of the humerus
, to the back of the forearm
, and descends on its ulnar side as far as the wrist
, distributing filaments to the skin
.
It communicates with the medial brachial cutaneous, the dorsal antibrachial cutaneous branch of the radial, and the dorsal branch of the ulnar.
Medial cord
The Medial cord is a division of the brachial plexus.The medial cord gives rise to the following nerves:*The median pectoral nerve, C8 and T1, to the pectoralis muscle*The medial brachial cutaneous nerve, T1...
of the brachial plexus
Brachial plexus
The brachial plexus is a network of nerve fibers, running from the spine, formed by the ventral rami of the lower four cervical and first thoracic nerve roots...
.
It derives its fibers from the eighth cervical and first thoracic nerves, and at its commencement is placed medial to the axillary artery
Axillary artery
In human anatomy, the axillary artery is a large blood vessel that conveys oxygenated blood to the lateral aspect of the thorax, the axilla and the upper limb...
.
It gives off, near the axilla, a filament, which pierces the fascia and supplies the integument covering the Biceps brachii, nearly as far as the elbow.
The nerve then runs down the ulnar side of the arm medial to the brachial artery
Brachial artery
The brachial artery is the major blood vessel of the arm.It is the continuation of the axillary artery beyond the lower margin of teres major muscle. It continues down the ventral surface of the arm until it reaches the cubital fossa at the elbow. It then divides into the radial and ulnar arteries...
, pierces the deep fascia with the basilic vein
Basilic vein
In human anatomy, the basilic vein is a large superficial vein of the upper limb that helps drain parts of hand and forearm. It originates on the medial side of the dorsal venous network of the hand, and it travels up the base of the forearm and arm...
, about the middle of the arm, and divides into a volar and an ulnar branch.
Volar branch
The volar branch (ramus volaris; anterior branch), the larger, passes usually in front of, but occasionally behind, the vena mediana cubiti (median basilic vein).It then descends on the front of the ulnar side of the forearm, distributing filaments to the skin as far as the wrist, and communicating with the palmar cutaneous branch of the ulnar nerve.
Ulnar branch
The ulnar branch (ramus ulnaris; posterior branch) passes obliquely downward on the medial side of the basilic veinBasilic vein
In human anatomy, the basilic vein is a large superficial vein of the upper limb that helps drain parts of hand and forearm. It originates on the medial side of the dorsal venous network of the hand, and it travels up the base of the forearm and arm...
, in front of the medial epicondyle of the humerus
Humerus
The humerus is a long bone in the arm or forelimb that runs from the shoulder to the elbow....
, to the back of the forearm
Forearm
-See also:*Forearm flexors*Forearm muscles...
, and descends on its ulnar side as far as the wrist
Wrist
In human anatomy, the wrist is variously defined as 1) the carpus or carpal bones, the complex of eight bones forming the proximal skeletal segment of the hand;...
, distributing filaments to the skin
Skin
-Dermis:The dermis is the layer of skin beneath the epidermis that consists of connective tissue and cushions the body from stress and strain. The dermis is tightly connected to the epidermis by a basement membrane. It also harbors many Mechanoreceptors that provide the sense of touch and heat...
.
It communicates with the medial brachial cutaneous, the dorsal antibrachial cutaneous branch of the radial, and the dorsal branch of the ulnar.
See also
- Dorsal antebrachial cutaneous nerve
- Lateral antebrachial cutaneous nerve
- Medial brachial cutaneous nerve