Encyclopedia entry
Flexor Pollicis Brevis
Abstract
The flexor pollicis brevis has been reported absent or incorporated into the opponens. The muscle may be inseparably joined to adductor pollicis. The belly of the muscle may be divided. The muscle may be doubled or absent. An interesting pattern of innervation has been reported for this muscle. The superficial head may be innervated by the median, ulnar or both nerves with a frequency ratio of 13-10-7, while the deep head is innervated primarily by the ulnar (16 of 24 cases), by the median (3 of 24 cases), or by both nerves (5 of 24 cases).
The flexor pollicis brevis has been reported absent or incorporated into the opponens. The muscle may be inseparably joined to adductor pollicis. The belly of the muscle may be divided. The muscle may be doubled or absent.
An interesting pattern of innervation has been reported for this muscle. The superficial head may be innervated by the median, ulnar or both nerves with a frequency ratio of 13-10-7, while the deep head is innervated primarily by the ulnar (16 of 24 cases), by the median (3 of 24 cases), or by both nerves (5 of 24 cases).
Riferimenti dell’opera originale
Elenco riportato come compare nella fonte, senza normalizzazione dei formati bibliografici.
- Anson, B.J.., Ed. (1966) Morris' Human Anatomy, 12th ed., The Blakiston Division, McGraw-Hill Book Company, New York.
- Day, M.H. and J.R. Napier. (1961) The two heads of flexor pollicis brevis. J. Anat. 95:123-130.
- Gegenbaur, C. (1861) Ein Fall von mehrfachen Muskelanomalien an der oberen Extremität. Arch. Path. Anat. Physiol. Klin. Med. 21:376-385.
- Hall, H.S. (1903) Complete absence of the superficial flexors of the thumb and concurrent muscular anomalies. J. Anat. Physiol. 38:287-289.
- Macalister, A. (1875) Additional observations on muscular anomalies in human anatomy (third series), with a catalogue of the principal muscular anomalies hitherto published. Trans. Roy. Irish Acad. Sci. 25:1-134.
Anatomical classification
- Systems:
- Muscular system
Content provenance
Adaptation
Adaptation of «Flexor Pollicis Brevis — Illustrated Encyclopedia of Human Anatomic Variation: Opus I: Muscular System» by Ronald A. Bergman, Adel K. Afifi, Ryosuke Miyauchi. Source: https://www.anatomyatlases.org/AnatomicVariants/MuscularSystem/Text/F/21Flexor.shtml Original work distributed under the CC BY-NC-SA 4.0 licence (https://creativecommons.org/licenses/by-nc-sa/4.0/deed.it). Adaptation by Redazione AIVA. Changes from the original: Testo originale inglese riprodotto integralmente e riorganizzato nel formato scheda del portale (sintesi, testo, riferimenti), senza modificarne le affermazioni. La traduzione italiana non è ancora stata eseguita, e la pagina lo dichiara. Le figure non sono state copiate: sono collegate alla pagina d’origine. This publication is not approved or endorsed by the authors of the original work.
Licence
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