In the palm of the
hand
A hand is a prehensile, multi-fingered appendage located at the end of the forearm or forelimb of primates such as humans, chimpanzees, monkeys, and lemurs. A few other vertebrates such as the koala (which has two opposable thumbs on each "h ...
the
median nerve
The median nerve is a nerve in humans and other animals in the upper limb. It is one of the five main nerves originating from the brachial plexus.
The median nerve originates from the lateral and medial cords of the brachial plexus, and has contr ...
is covered by the skin and the
palmar aponeurosis
The palmar aponeurosis (palmar fascia) invests the muscles of the palm, and consists of central, lateral, and medial portions.
Structure
The central portion occupies the middle of the palm, is triangular in shape, and of great strength
Its apex i ...
, and rests on the tendons of the Flexor muscles. Immediately after emerging from under the
transverse carpal ligament
The flexor retinaculum (transverse carpal ligament, or anterior annular ligament) is a fibrous band on the palmar side of the hand near the wrist. It arches over the carpal bones of the hands, covering them and forming the carpal tunnel.
Structur ...
the
median nerve
The median nerve is a nerve in humans and other animals in the upper limb. It is one of the five main nerves originating from the brachial plexus.
The median nerve originates from the lateral and medial cords of the brachial plexus, and has contr ...
becomes enlarged and flattened and splits into a smaller, lateral, and a larger, medial portion.
The ''medial portion'' of the nerve divides into two Common palmar digital nerves (common volar digital nerves).
* The first of these gives a twig to the second Lumbricalis and runs toward the cleft between the
index
Index (or its plural form indices) may refer to:
Arts, entertainment, and media Fictional entities
* Index (''A Certain Magical Index''), a character in the light novel series ''A Certain Magical Index''
* The Index, an item on a Halo megastru ...
and
middle finger
The middle finger, long finger, second finger, third finger, toll finger or tall man is the third digit of the human hand, located between the index finger and the ring finger. It is typically the longest digit. In anatomy, it is also called ...
s, where it divides into two proper digital nerves for the adjoining sides of these digits;
* the second runs toward the cleft between the
middle and
ring finger
The ring finger, third finger, fourth finger, leech finger, or annulary is the fourth digit of the human hand, located between the middle finger and the little finger.
Sometimes the term ring finger only refers to the fourth digit of a left-han ...
s, and splits into two proper digital nerves for the adjoining sides of these digits; it communicates with a branch from the
ulnar nerve
In human anatomy, the ulnar nerve is a nerve that runs near the ulna bone. The ulnar collateral ligament of elbow joint is in relation with the ulnar nerve. The nerve is the largest in the human body unprotected by muscle or bone, so injury is ...
and sometimes sends a twig to the third Lumbricalis.
Additional images
File:Gray811and813.PNG, Cutaneous nerves of right upper extremity.
File:Gray812and814.PNG, Diagram of segmental distribution of the cutaneous nerves of the right upper extremity.
File:Slide6gggg.JPG, Common palmar digital nerves
File:Slide6RRR.JPG, Common palmar digital branches of median nerve
File:Slide5PPP.JPG, Common palmar digital branches of median nerve
File:Slide10AAAA.JPG, Common palmar digital branches of median nerve
File:Slide12BBBB.JPG, Common palmar digital branches of median nerve
File:Slide7HHHH.JPG, Common palmar digital branches of median nerve
File:Slide7IIII.JPG, Common palmar digital branches of median nerve
File:Slide8VVVVV.JPG, Common palmar digital branches of median nerve
See also
*
Proper palmar digital nerves of median nerve
In the palm of the hand the median nerve is covered by the skin and the palmar aponeurosis, and rests on the tendons of the flexor muscles. Immediately after emerging from under the transverse carpal ligament the median nerve becomes enlarged and ...
References
External links
*
Nerves of the upper limb
{{Neuroanatomy-stub