Adductor pollicis muscle
| Adductor pollicis muscle |
|---|
|
| origin |
|
Caput obliquum : Os capitatum and Os metacarpale II and III Caput transversum : palmar at the Os metacarpale II and III |
| approach |
| medial to the base of the thumb , ulnar sesamoideum |
| function |
| Inward pulling of the thumb |
| Innervation |
| Ulnar nerve ( ramus profundus ) |
| Spinal segments |
| C8, Th1 |
The adductor pollicis muscle ( Latin for "thumb puller") is the strongest skeletal muscle of the ball of the thumb ( thenar ) and thus one of the muscles of the hand . It lies in the depths of the thenar, directly on the interossei muscles I and II , and forms a triangular muscle plate in the metacarpal area .
The muscle has two heads: the oblique head and the transverse head . The caput obliquum arises from the head bone , the bases of the metacarpals II and III, the intercarpal ligaments and the sheath of the tendon of the flexor carpi radialis muscle . The transverse head is triangular, it arises from the lower two-thirds of the hand side surface of the third metacarpal.
The adductor pollicis muscle brings the thumb up to the index finger . In addition, it causes little opposition and elongation in the metatarsophalangeal joint .
The adductor pollicis muscle is innervated by the ulnar nerve. The nerve is accompanied by the arcus palmaris profundus . The radial artery runs between the two heads of the muscle, from the back of the hand into the palm.
literature
- Walther Graumann: Compact textbook anatomy . Schattauer Verlag, 2004, ISBN 978-3-7945-2062-6 , Volume 2, p. 367.
- Karl Zilles, Gerd Rehkämper: Functional Neuroanatomy. Springer Verlag, Berlin / Heidelberg 1993, ISBN 978-3-540-54690-0 .
- Peter Berlit: Basic knowledge of neurology. 6th edition. Springer Verlag, Berlin / Heidelberg 2014, ISBN 978-3-642-37783-9 .
Web links
- Doccheck Flexikon accessed on February 8, 2016
- Towards the thumb, accessed on February 8, 2016
Individual evidence
- ^ Gray's Anatomy 1918.