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Encyclopedia > Ulnar nerve
Nerve: Ulnar nerve
Click image to enlarge - ulnar nerve is visible in lower left
Nerves of the left upper extremity. (Ulnar labeled at center left.)
Latin nervus ulnaris
Gray's subject #210 943
Innervates flexor carpi ulnaris
flexor digitorum profundis
lumbrical muscles
opponens digiti minimi
flexor digiti minimi
abductor digiti minimi
interossei
adductor pollicis
From Medial cord
MeSH Ulnar+nerve
Dorlands/Elsevier n_05/12566994

In human anatomy, the ulnar nerve is a nerve which runs from the shoulder to the hand, at one part running near the ulna bone. It is the only exposed nerve in the human body (it is unprotected for a few centimeters at the elbow). This is the nerve that is aggravated when someone discusses "hitting their funny bone." Image File history File links Brachial_plexus. ... Image File history File links Download high resolution version (524x1000, 162 KB) File links The following pages link to this file: Ulnar nerve Long thoracic nerve Wikipedia:Grays Anatomy images with missing articles 17 Musculocutaneous nerve List of images in Grays Anatomy: IX. Neurology ... For other uses, see Latin (disambiguation). ... In anatomy, flexor carpi ulnaris muscle is a muscle of the human forearm that acts to flex and adduct the hand. ... In human anatomy, the flexor digitorum profundus is a muscle in the forearm that flexes the fingers. ... The lumbrical muscles are intrinsic muscles in the fingers that allow flexion at the metacarpophalangeal joints, while maintaining extension at the interphalangeal joints. ... The Opponens digiti quinti (Opponens minimi digiti) is of a triangular form, and placed immediately beneath the preceding muscles. ... For the muscle of the foot, see Flexor digiti quinti brevis muscle (foot) The flexor digiti minimi brevis is a muscle in the hand that flexes the little finger. ... For the muscle of the foot, see Abductor digiti quinti muscle (foot) The Abductor digiti quinti (Abductor minimi digiti) is situated on the ulnar border of the palm of the hand. ... Interossei refer to muscles between the bones. ... The Adductor pollicis muscle is a muscle of the human body. ... The Medial cord is a division of the brachial plexus. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Elseviers logo. ... List of bones of the human skeleton Human anatomy is primarily the scientific study of the morphology of the adult human body. ... The ulna (Elbow Bone) [Figs. ...

Contents

Course

The ulnar nerve comes from the medial cord of the brachial plexus, and runs inferior on the medial/posterior aspect of the humerus down the arm, going behind the medial epicondyle at the elbow. Because of the mild pain and tingling throughout the forearm associated with an inadvertent impact of the nerve at this point, it is usually called the funny bone. (It may also have to do with its location relative to the humerus, as the name "humerus" is a homonym to the word "humorous", though as anyone who has had it struck can confirm, the act is truly anything but funny). The brachial plexus is an arrangement of nerve fibres (a plexus) running from the spine (vertebrae C5-T1), through the neck, the axilla (armpit region), and into the arm. ... The humerus is a long bone in the arm or fore-legs (animals) that runs from the shoulder to the elbow. ... Medial epicondyle can refer to: Medial epicondyle of the humerus Medial epicondyle of the femur Category: ... Elbow redirects here. ...


It enters the anterior (front) side of the forearm and runs alongside the ulna. There it supplies one and a half muscles (flexor carpi ulnaris & medial half of flexor digiti profundus). It soon joins with the ulnar artery, and the two travel inferiorly together, deep to the flexor carpi ulnaris muscle. The ulna (Elbow Bone) [Figs. ... The ulnar artery is the main blood vessel, with oxygenated blood, of the medial aspect of the forearm. ... In anatomy, flexor carpi ulnaris muscle is a muscle of the human forearm that acts to flex and adduct the hand. ...


After its journey down the ulna, the ulnar nerve enters the palm of the hand. Unlike the median nerve which travels below the flexor retinaculum of the hand and through the carpal tunnel, the ulnar nerve and artery pass superficial to the flexor retinaculum via the ulnar canal. The median nerve is a nerve that runs down the arm and forearm. ... The flexor retinaculum (transverse carpal ligament, or anterior annular ligament) is a strong, fibrous band, which arches over the carpus, converting the deep groove on the front of the carpal bones into a tunnel, the carpal tunnel, through which the Flexor tendons of the digits and the median nerve pass. ... This article is about the connective tissue. ... The flexor retinaculum (transverse carpal ligament, or anterior annular ligament) is a strong, fibrous band, which arches over the carpus, converting the deep groove on the front of the carpal bones into a tunnel, the carpal tunnel, through which the Flexor tendons of the digits and the median nerve pass. ... The ulnar canal, also called Guyons canal, is a potential space at the wrist between the pisiform bone and the hamate bone through which the ulnar artery and the ulnar nerve travel into the hand. ...


Branches and innervation

Muscular

The ulnar nerve and its branches innervate the following muscles in the forearm and hand:


An Articular branch that passes to the elbow joint while the ulnar nerve is passing between the olecranon and medial epicondyle of the femur.

// The Human Forearm The forearm is the structure on the upper limb, between the elbow and the wrist. ... The muscular branches of ulnar nerve, two in number, arise near the elbow: one supplies the Flexor carpi ulnaris; the other, the ulnar half of the Flexor digitorum profundus. ... In anatomy, flexor carpi ulnaris muscle is a muscle of the human forearm that acts to flex and adduct the hand. ... The flexor digitorum profundis is a muscle in the forearm that flexes the fingers. ... For other uses, see Hand (disambiguation). ... The deep branch of the ulnar nerve, accompanied by the deep branch of the ulnar artery, passes between the abductor digiti minimi and the flexor digiti minimi brevis. ... Hypothenar refers to a group of three muscles of the palm that control the motion of the little finger. ... The Opponens digiti quinti (Opponens minimi digiti) is of a triangular form, and placed immediately beneath the preceding muscles. ... For the muscle of the foot, see Abductor digiti quinti muscle (foot) The Abductor digiti quinti (Abductor minimi digiti) is situated on the ulnar border of the palm of the hand. ... For the muscle of the foot, see Flexor digiti quinti brevis muscle (foot) The flexor digiti minimi brevis is a muscle in the hand that flexes the little finger. ... The Adductor pollicis muscle is a muscle of the human body. ... The lumbrical muscles are intrinsic muscles in the fingers that allow flexion at the metacarpophalangeal joints, while maintaining extension at the interphalangeal joints. ... The dorsal interossei of the hand are muscles that occupy the space between the metacarpals. ... The palmar interossei (interossei volares) are small muscles in the hand that lie on the anterior aspect of the metacarpals. ... The superficial branch of the ulnar nerve supplies the palmaris brevis and the skin on the ulnar side of the hand, and divides into a proper palmar digital nerve for the ulnar side of the little finger, and a common palmar digital nerve which gives a communicating twig to the... The Palmaris brevis is a thin, quadrilateral muscle, placed beneath the integument of the ulnar side of the hand. ...

Cutaneous

The ulnar nerve also provides sensory innervation to the part of the hand corresponding to the fourth and fifth digits: Cutaneous innervation refers to the area of the skin which is supplied by a specific nerve. ...

The palmar branch of the ulnar nerve arises about 5 cm above the wrist from where the ulnar nerve splits into palmar and dorsal branches. ... The dorsal branch of ulnar nerve arises about 5 cm. ...

Ulnar nerve entrapment

The Ulnar nerve can be trapped or pinched in various ways as it proceeds down the arm from the Brachial plexus to the ring and middle fingers. One common cause is cubital tunnel syndrome, where the tunnel runs the inner outside side of the elbow. Pinching of the nerve often causes tingling symptoms in the little and ring fingers. In some cases moderate to severe pain is experienced from pinching this nerve. Often such pins and needles sensations can be caused by sleeping wrong on your arm, but sometimes the problems last for days. In severe cases, surgery is performed. Ulnar nerve entrapment is a condition where the ulnar nerve becomes trapped or pinched due to some physiological abnormalities // Commonly, this causes pain, numbness, or paralysis of the ring and little fingers which may extend up the arm. ... alex is cool ... Paresthesia or paraesthesia (in British English) is a sensation of tingling, pricking, or numbness of a persons skin with no apparent long-term physical effect, more generally known as the feeling of pins and needles or of a limb being asleep (but not directly related to the phenomenon of...


See also

In human anatomy, the radial artery is the main blood vessel, with oxygenated blood, of the lateral aspect of the forearm. ... The axillary nerve is a nerve of the human body, that comes off the posterior cord of the brachial plexus at the level of the axilla (armpit) and carries nerve fibers from C5 and C6. ... The median nerve is a nerve that runs down the arm and forearm. ...

Additional images

External links


  Results from FactBites:
 
Ulnar nerve - Wikipedia, the free encyclopedia (374 words)
The ulnar nerve is a nerve that in humans runs down the arm and forearm, and into the hand.
The ulnar nerve comes from the lower cord of the brachial plexus, and runs posterior to the humerus down the arm, going behind the medial epicondyle at the elbow.
Muscles in the hand supplied by the ulnar nerve include the medial two lumbrical muscles, the muscles of the hypothenar eminence (opponens digiti minimi, flexor digiti minimi and abductor digiti minimi), the interossei (palmar and dorsal groups) and the adductor pollicis muscle.
  More results at FactBites »

 
 

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