Medial cutaneous nerve of arm
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The medial brachial cutaneous nerve (lesser internal cutaneous nerve; medial cutaneous nerve of arm) is distributed to the skin on the medial brachial side of the arm.


Anatomy

It is the smallest branch of the
brachial plexus The brachial plexus is a network () of nerves formed by the anterior rami of the lower four cervical nerves and first thoracic nerve ( C5, C6, C7, C8, and T1). This plexus extends from the spinal cord, through the cervicoaxillary canal in t ...
, and arising from the
medial cord The medial cord is the part of the brachial plexus formed by of the anterior division of the lower trunk (C8-T1). Its name comes from it being medial to the axillary artery as it passes through the axilla. The other cords of the brachial plexus a ...
receives its fibers from the eighth cervical and first thoracic nerves. It passes through the
axilla The axilla (also, armpit, underarm or oxter) is the area on the human body directly under the shoulder joint. It includes the axillary space, an anatomical space within the shoulder girdle between the arm and the thoracic cage, bounded superior ...
, at first lying behind, and then medial to the
axillary vein In human anatomy, the axillary vein is a large blood vessel that conveys blood from the lateral aspect of the thorax, axilla (armpit) and upper limb toward the heart. There is one axillary vein on each side of the body. Structure Its origin ...
, and communicates with the
intercostobrachial nerve The intercostobrachial nerves are cutaneous branches of the intercostal nerves. Second intercostal nerve The lateral cutaneous branch of the second intercostal nerve does not divide, like the others, into an anterior and a posterior branch; it is ...
. It descends along the medial side of the brachial artery to the middle of the arm, where it pierces the
deep fascia Deep fascia (or investing fascia) is a fascia, a layer of dense connective tissue that can surround individual muscles and groups of muscles to separate into fascial compartments. This fibrous connective tissue interpenetrates and surrounds the ...
, and is distributed to the skin of the back of the lower third of the
arm In human anatomy, the arm refers to the upper limb in common usage, although academically the term specifically means the upper arm between the glenohumeral joint (shoulder joint) and the elbow joint. The distal part of the upper limb between th ...
, extending as far as the
elbow The elbow is the region between the arm and the forearm that surrounds the elbow joint. The elbow includes prominent landmarks such as the olecranon, the cubital fossa (also called the chelidon, or the elbow pit), and the lateral and the me ...
, where some filaments are lost in the skin in front of the medial epicondyle, and others over the
olecranon The olecranon (, ), is a large, thick, curved bony eminence of the ulna, a long bone in the forearm that projects behind the elbow. It forms the most pointed portion of the elbow and is opposite to the cubital fossa or elbow pit. The olecranon ...
. It communicates with the ulnar branch of the medial antebrachial cutaneous nerve.


Eponym

The term nerve of Wrisberg (after Heinrich August Wrisberg) has been used to describe this nerve. However, the term "nerve of Wrisberg" can also refer to the
nervus intermedius The intermediate nerve, nervus intermedius, nerve of Wrisberg or Glossopalatine nerve, is the part of the facial nerve (cranial nerve VII) located between the motor component of the facial nerve and the vestibulocochlear nerve (cranial nerve VII ...
branch of the
facial nerve The facial nerve, also known as the seventh cranial nerve, cranial nerve VII, or simply CN VII, is a cranial nerve that emerges from the pons of the brainstem, controls the muscles of facial expression, and functions in the conveyance of taste ...
.


See also

*
Superior lateral cutaneous nerve of arm The superior lateral cutaneous nerve of arm (or superior lateral brachial cutaneous nerve) is the continuation of the posterior branch of the axillary nerve, after it pierces the deep fascia. It contains axons from C5-C6 ventral rami. Structure I ...
*
Inferior lateral cutaneous nerve of arm The inferior lateral cutaneous nerve of arm is a nerve found in humans and other animals. It is also called the inferior lateral brachial cutaneous nerve. It is a branch of the radial nerve that provides sensory and vasomotor innervation to the lo ...
*
Posterior cutaneous nerve of arm The posterior cutaneous nerve of arm (internal cutaneous branch of musculospiral, posterior brachial cutaneous nerve) is a branch of the radial nerve that provides sensory innervation for much of the skin on the back of the arm. It arises in the a ...


References


Additional images

File:Brachial plexus.svg, Brachial plexus File:Brachial_plexus_color.svg, Brachial plexus with courses of spinal nerves shown File:Slide3zzz.JPG, Medial brachial cutaneous nerve File:Slide6bbbb.JPG, Medial brachial cutaneous nerve File:Slide1hhhh.JPG, Medial brachial cutaneous nerve File:Slide22EE.JPG, brachial cutaneous nerve File:Slide11EEEE.JPG, brachial cutaneous nerve File:Slide3FFF.JPG, brachial cutaneous nerve File:Slide4KKK.JPG, Brachial cutaneous nerve File:Slide5ZZZ.JPG, Brachial cutaneous nerve File:Slide4WWW.JPG, Brachial cutaneous nerve File:Slide12WWW.JPG, Brachial cutaneous nerve File:Slide8FFFF.JPG, Brachial cutaneous nerve File:Slide1ecc.JPG, Brachial plexus.Deep dissection.Anterolateral view


External links

* * * Nerves of the upper limb {{Neuroanatomy-stub