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Encyclopedia > Thenar eminence
Thenar eminence
The mucous sheaths of the tendons on the front of the wrist and digits.
Transverse section across the wrist and digits. (Muscles of thumb labeled at upper left.)
Latin eminentia thenaris
Gray's subject #126 546
Origin:
Insertion:
Artery:
Nerve: median nerve
Action: control movement of the thumb
Dorlands/Elsevier t_07/12801990

The thenar eminence is the body of muscle on the palm of the human hand just beneath the thumb. Image File history File links Size of this preview: 442 × 600 pixelsFull resolution (516 × 700 pixel, file size: 66 KB, MIME type: image/png) File historyClick on a date/time to view the file as it appeared at that time. ... Image File history File links Gray422. ... For other uses, see Latin (disambiguation). ... A typical adult human skeleton consists of the following 206 bones, though this number does vary owing to a variety of anatomical variations; for example, a small portion of the human population have an extra rib, or an extra lumbar vertebra. ... A typical adult human skeleton consists of the following 206 bones, though this number does vary owing to a variety of anatomical variations; for example, a small portion of the human population have an extra rib, or an extra lumbar vertebra. ... Section of an artery For other uses, see Artery (disambiguation). ... List of human nerves External links List of nerves This is an incomplete list, which may never be able to satisfy certain standards for completeness. ... The median nerve is a nerve that runs down the arm and forearm. ... Kinesiology is the scientific study of human movement. ... The thumb is one of the five fingers. ... Elseviers logo. ... A top-down view of skeletal muscle Muscle (from Latin musculus little mouse [1]) is contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. ... For other uses, see Hand (disambiguation). ... The thumb is one of the five fingers. ...


The muscles in this location are usually innervated by the recurrent branch of the median nerve, except for the adductor pollicis, which is supplied by the deep branch of the ulnar nerve. They all control movement of the thumb. The median nerve is a nerve that runs down the arm and forearm. ...

  • Adductor pollicis draws the 1st metacarpal laterally to oppose thumb toward center of palm and rotate it medially.
  • Abductor pollicis brevis abducts the thumb. This means that if the hand was laid flat so the palm faced upwards, this muscle would point the thumb upwards. This muscle is the most proximal of the thenar group.
  • Opponens pollicis lies deep to abductor pollicis brevis. As its name suggests it opposes the thumb, bringing it against the fingers. This is a very important movement, as most of our dexterity comes from this action.

The innervation of these muscles by the median nerve is unusual, as most of the intrinsic muscles on the palm of the hand are supplied by the ulnar nerve. The lateral two lumbrical muscles are the other exception. The Adductor pollicis muscle is a muscle of the human body. ... The Abductor pollicis brevis muscle is a muscle of the human body. ... The Flexor pollicis brevis muscle is a muscle of the human body. ... The Opponens pollicis muscle is a muscle of the human body. ... 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. ... The lumbrical muscles are intrinsic muscles in the fingers that allow flexion at the metacarpophalangeal joints, while maintaining extension at the interphalangeal joints. ...


Another muscle that controls movement of the thumb is adductor pollicis. It lies deeper and more distal to flexor pollicis brevis. Despite its name, its main action is mainly rotation and opposition. It is not in the thenar group of muscles, so is supplied by the ulnar nerve. The Adductor pollicis muscle is a muscle of the human body. ...


Mnemonic

A good way to remember what muscles are in the thenar eminence is "OAF"; oafs have big thenar eminences. 'O' = opponens, 'A' = abductor, 'F' = flexor. There is only one opponens. The other two muscles each have a long partner and thus are called "brevis."


ABOF (pronounced "above") the Law muscles. The law states muscles of the hand are supplied by ulnar nerve. However, ABOF the Law muscles are supplied by MEDIAN nerve. 'AB' = abductor, 'O' = Opponens, 'F' = Flexor, Law 'L' = Lateral Lumbricals (2).


See also

Hypothenar refers to a group of three muscles of the palm that control the motion of the little finger. ...

External links

  • thenar and hypothenar muscles (deep)
  • thenar and hypothenar muscles (superficial)

  Results from FactBites:
 
XII. Surface Anatomy and Surface Markings. 11. Surface Anatomy of the Upper Extremity. Gray, Henry. 1918. Anatomy of ... (3729 words)
The lateral eminence consists of the Brachioradialis and the Extensores carpi radiales longus and brevis, and descends from the lateral supracondylar ridge in the direction of the styloid process of the radius.
The medial eminence comprises the Extensor digitorum communis, Extensor digiti quinti proprius, and the Extensor carpi ulnaris; it begins at the lateral epicondyle of the humerus as a tapering mass which is separated above from the Anconæus by a well-marked furrow, and below from the Pronator teres and Flexor group by the ulnar furrow.
The muscles of the hand are principally concerned, as regards surface form, in producing the thenar and hypothenar eminences, and cannot be individually distinguished; the thenar eminence, on the radial side, is larger and rounder than the hypothenar, which is a long narrow elevation along the ulnar side of the palm.
  More results at FactBites »

 
 

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