Lateral cutaneous nerve of forearm
Encyclopedia
The lateral antebrachial cutaneous nerve (or lateral cutaneous nerve of forearm) (branch of musculocutaneous nerve
, also sometimes spelled "antebrachial") passes behind the cephalic vein
, and divides, opposite the elbow-joint, into a volar
and a dorsal
branch.
to the wrist, and supplies the skin over the lateral half of its volar surface.
At the wrist-joint it is placed in front of the radial artery
, and some filaments, piercing the deep fascia, accompany that vessel to the dorsal surface of the carpus
.
The nerve then passes downward to the ball of the thumb
, where it ends in cutaneous filaments.
It communicates with the superficial branch of the radial nerve
, and with the palmar cutaneous branch of the median nerve
.
.
It supplies the skin of the lower two-thirds of the dorso-lateral surface of the forearm, communicating with the superficial branch of the radial nerve and the dorsal antebrachial cutaneous branch of the radial.
Musculocutaneous nerve
The musculocutaneous nerve arises from the lateral cord of the brachial plexus, opposite the lower border of the Pectoralis major, its fibers being derived from C5, C6 and C7.-Path:...
, also sometimes spelled "antebrachial") passes behind the cephalic vein
Cephalic vein
In human anatomy, the cephalic vein is a superficial vein of the upper limb.It communicates with the basilic vein via the median cubital vein at the elbow and is located in the superficial fascia along the anterolateral surface of the biceps brachii muscle.Superiorly the cephalic vein passes...
, and divides, opposite the elbow-joint, into a volar
Volar
Volar may refer to:*Volar, Afghanistan*Flight*Volar Airlines*Anatomical terms of location#Relative_directions_in_the_limbs**Volar arches**Volar branch of ulnar nerve**Volar radioulnar ligament**Volar carpal branch...
and a dorsal
Dorsum (biology)
In anatomy, the dorsum is the upper side of animals that typically run, fly, or swim in a horizontal position, and the back side of animals that walk upright. In vertebrates the dorsum contains the backbone. The term dorsal refers to anatomical structures that are either situated toward or grow...
branch.
Volar branch
The volar branch (ramus volaris; anterior branch) descends along the radial border of the forearmForearm
-See also:*Forearm flexors*Forearm muscles...
to the wrist, and supplies the skin over the lateral half of its volar surface.
At the wrist-joint it is placed in front of the radial artery
Radial artery
In human anatomy, the radial artery is the main blood vessel, with oxygenated blood, of the lateral aspect of the forearm.-Course:The radial artery arises from the bifurcation of the brachial artery in the cubital fossa. It runs distally on the anterior part of the forearm...
, and some filaments, piercing the deep fascia, accompany that vessel to the dorsal surface of the carpus
Carpus
In tetrapods, the carpus is the sole cluster of bones in the wrist between the radius and ulna and the metacarpus. The bones of the carpus do not belong to individual fingers , whereas those of the metacarpus do. The corresponding part of the foot is the tarsus...
.
The nerve then passes downward to the ball of the thumb
Thumb
The thumb is the first digit of the hand. When a person is standing in the medical anatomical position , the thumb is the lateral-most digit...
, where it ends in cutaneous filaments.
It communicates with the superficial branch of the radial nerve
Radial nerve
The radial nerve is a nerve in the human body that supplies the upper limb. It supplies the medial and lateral heads of the triceps brachii muscle of the arm, as well as all 12 muscles in the posterior osteofascial compartment of the forearm and the associated joints and overlying skin.It...
, and with the palmar cutaneous branch of the median nerve
Median nerve
The median nerve is a nerve in humans and other animals. It is in the upper limb. It is one of the five main nerves originating from the brachial plexus....
.
Dorsal branch
The dorsal branch (ramus dorsalis; posterior branch) descends, along the dorsal surface of the radial side of the forearm to the wristWrist
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;...
.
It supplies the skin of the lower two-thirds of the dorso-lateral surface of the forearm, communicating with the superficial branch of the radial nerve and the dorsal antebrachial cutaneous branch of the radial.
See also
- Medial cutaneous nerve of forearmMedial cutaneous nerve of forearmThe Medial Antebrachial Cutaneous Nerve arises from the medial cord of the brachial plexus....
- Posterior cutaneous nerve of forearmPosterior cutaneous nerve of forearmThe 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...
- Superior lateral cutaneous nerve of armSuperior lateral cutaneous nerve of armThe superior lateral cutaneous nerve of arm is the continuation of the posterior cord of the axillary nerve, after it pierces the deep fascia.-Course and targets:...