Illustrated Encyclopedia of Human Anatomic Variation: Opus I: Muscular System: Alphabetical Listing of Muscles: F
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
Another slip may attach to the synovial bursa forming a tensor bursae mucosae tendinum. Fleshy slips are sometimes present uniting the belly of flexor pollicis longus with flexor digitorum superficialis or profundus.These, as well as humeral and coronoid heads, are indications of the original connection between the divisions of the deep flexor sheet of muscles.The accessory coronoid head is subject to some variation, occasionaly being divided distally into two or three slips passing to flexor pollicis longus, flexor digitorum profundus, flexor digitorum superficialis, or pronator teres. Pronator teres may give some fasciculi to the flexor of the thumb.
Flexor pollicis longus may arise from brachialis.
According to Macalister, flexor pollicis longus has been seen:
Mori's observations complement those of Macalister. Mori found Gantzer's fasciculus (muscle) arising from the medial epicondyle of the humerus in 24% of his cases, from the coronoid process of the ulna in 68%, and jointly from the medial epicondyle and from the coronoid process in 8%
Gantzer's Muscle |
Authors |
% |
---|---|---|
Caucasian (European) |
LeDouble |
33.3 |
Caucasian (European) |
Wood |
39 |
Blacks |
Loth |
89.3 |
Aino |
Sano |
70.0 |
Asian (Japanese) |
Adachi |
62.7 |
Asian (Japanese) |
Inoue |
71.0 |
Asian (Japanese) |
Mori |
50 |
Mori also points out that the terminal tendon and Gantzer's muscle also varies.
Mori also points out other relationships of fpl; Fpl and flexor digitorum profundus may be joined by a muscular slip (12.5%); a tendinous slip from the terminal tendon of fpl may be fused with the terminal tendon of profundus (fdp) for the index finger (7.5%); Gantzer's fasciculus may be divided into two parts, and the terminal tendon of the first part is fused with the fpl and the terminal tendon from the second part goes distally to fuse with the tendon of fdp for the index finger.
The fpl may not arise from the interosseous membrane in 7.5% of cases.
Gantzer's Muscle joining flexor pollicis longus.
Laboratory specimen, University of Iowa.
Gantzer's Muscle.
from Schäfer and Thane, Quain's Anatomy.
Varieties of Gantzer's Muscle.
from Mangini.
The Thumb and Index Finger share a common tendon.
The source of the common tendon is not known in this case, but flexor
pollicis longus is frequently partially doubled and is known to give
rise to an accessory tendon that extends to the index finger.
From a Graduate Student.
References
Anson, B.J., Ed. (1966) Morris' Human Anatomy.12th ed., The Blakiston Division, McGraw-Hill Book Company, New York.
Dykes, J. and B.J. Anson. (1944) The accessory tendon of the flexor pollicis longus muscle. Anat. Rec. 90:83-87.
Gegenbaur, C. (1861) Ein Fall von mehrfachen Muskelanomalien an der oberen Extremität. Arch. Path. Anat. Physiol. Klin. Med. 21:376-385.
Gruber, W. (1872) Zergleiderung eines linken Armes mit Duplicitat des Daumens. Bull. Acad. Imp. Sci. St.-Petersbourg. 17:24-31.
Hall, H.S. (1903) Complete absence of the superficial flexors of the thumb and concurrent anomalies. J. Anat. Physiol. 38:287-289.
LeDouble, A.F. (1897) Traité des Variations du Système Musculaire de l'Homme et Leur Signification au Point de Vue de l'Anthropologie Zoologique, Libraire C. Reinwald, Ed., Schleicher Frères, Paris.
Linburg, R.M. and B.E. Comstock. (1979) Anomalous tendon slips from the flexor pollicis longus to flexor digitorum profundus. J. Hand Surg. 4:79-83.
Macalister, A. (1875) Additional observatins on muscular anomalies in human anatomy (third series), with a catalogue of the principal musclular variations hitherto published. Trans. Roy. Irish Acad. Sci. 25:1-134.
Malhotra, V.K., Singh, N.P. and S.P. Tewari. (1982) The accessory head of the flexor pollicis muscle and its nerve supply. Anat. Anz. 151:503-505.
Mangini, U. (1960) Flexor pollicis longus muscle. J. Bone Joint Surg. (A) 42(3):467-470.
Mori, M. Statistics on the musculature of the Japanese. Okajimas Fol. Anat. Jap. 40:195-300.
Schäfer, E.A. and G.D. Thane., Eds. (1894) Quain's Anatomy, 10th ed. Longmans, Green, and Co., London
Usami, F. (1987) Bilateral congenital absence of the flexor pollicis longus with craniofacial abnormalities. J. Hand Surg. (Am) 12:603-604.
Wagstaffe, W.W. (1872) Partial deficiency of the tendon of the long flexor of the thumb. J. Anat. Physiol. 6:212-214.
Wilkinson, J.L. (1953) The insertions of the flexores pollicis longus et digitorum profundus. J. Anat. 87:75-88.
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