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
Macalister reported the following variations for this muscle:
Flexor carpi radialis brevis, a small muscle arising from the radius, usually inserts on the fibrous sheath of the tendon of flexor carpi radialis and terminates distally onto the base of the second or third metacarpal. It has been implicated in anterior interosseous nerve compression at its fibrous origin. It was reported present once in 400 limbs (Gruber) and, in another study, in six of 70 limbs (Wood).
Mori described a flexor carpi radialis accessorius (2.5% of cases), which arose from the belly of flexor carpi radialis (FCR), traveled with FCR, with a terminal tendon inserting onto the naviculare (scaphoid).
Flexor carpi radialis may be doubled (~2.0% of cases) and it may be absent (~2.5%). See also m. Pronator Quadratus.
Syn.: m. Radialis Internus, Rad. Anticus, Innerer Speichenmuskel, Speichenbeuger der hand, Grand Palmaire (Bichat).
A Doubled Flexor Carpi Radialis Muscle.
from Saadeh, Kawas, and Bergman.
Anson, B.J.., Ed. (1966) Morris' Human Anatomy, 12th ed. The Blakiston Division, McGraw-Hill Book Company, New York.
Bankart, J., Pye-Smith, P.H. and J.J. Phillips. (1869) Note of abnormalities observed in the dissecting room during sessions of 1866-67, 1867-68. Guy's Hosp. Reports 14:436-455.
Carleton, A. (1934-35) Flexor carpi radialis brevis vel profundus. J. Anat. 69:292-293.
Farber, J.S. and B.S. Bryan. (1968) The anterior osseous syndrome. J. Bone Joint Surg. (A) 50:521-523.
Gruber, W. (1872) Un muscle radial interne long bicaude chez l'homme, remplacant par une portion surnuméraire le palmaire grele, qui manqué. Bull. L'Acad. Imp. Sci. St. Petersbourg 17:318-319.
Gruber, W. (1872) Sur les varietes du muscle radial interne court. Bull. L'Acad. Imp. Sci. St. Petersbourg. 17:379-380.
Henle, J. (1871) Handbuch der Muskellehre des Menschen, in Handbuch der systematischen Anatomie. Verlag von Friedrich Vieweg und Sohn, Braunschweig.
Lahey, M.D. and P.L. Aulicino. (1986) Anomalous muscles associated with compression neuropathies. Orthopaedic Review 15(4):19-28.
Macalister, A. (1868) On the nature of the coronoid portion of pronator radii teres. J. Anat. Physiol. 2:8-12.
Macalister, A. (1875) Additional observations on muscular anomalies in human anatomy (third series), with a catalogue of the principal muscular variations hitherto published. Trans. Roy. Irish Acad. Sci. 25-1-134.
Mori, M. (1964) Statistics on the musculature of the Japanese. Okajimas Fol. Anat. Jap. 40:195-300.
Saadeh, F.A., Kawas, S.H. and R.A. Bergman (1990) A doubled flexor carpi radialis muscle. Gegenbaurs Morphol. Jahrbuch.(Leipzig). 136:201-204.
Spinner, M. (1970) The anterior interosseous nerve syndrome with special attention to its variations. J. Bone Joint Surg. (A) 52:84-94.
Spinner, M. (1978) Injuries to the Major Branches of Peripheral Nerves of the Forearm. 2nd ed. W.B. Saunders, Philadelphia.
Wood, J. (1867) On human muscular variations and their relation to comparative anatomy. J. Anat. Physiol. 1:44-59.
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