Illustrated Encyclopedia of Human Anatomic Variation: Part 1: Muscular System
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
Absence of the lateral head of Gastrocnemius
from Shepard, 1880
1a.: The CT scan on the left reveals an asymmetrical muscle mass (arrows) in the right popliteal fossa. The muscle mass joins the medial head of the right gastrocnemius muscle. 1b.: On the right side is a diagrammatic representation of the third head (*) of gastrocnemius that was redrawn form Chudzinski, 1882). The cut lines U, M, L correspond to the CT images shown on the left side. LH; Lateral head of gastrocnemius, MH; Medial head of gastrocnemius.
Twelve varieties of the third head of gastrocnemius
(redrawn from Frey, H., 1919)
Gastrocnemius tertius in a living subject
Compare this muscle with Flexor Accessorius Longus.
alpha, alpha', aponeurosis, origin of gluteoperinealis; Beta, Beta', belly of the same muscle; gamma, gamma', insertion of gluteoperinealis. 1, os coccyx; 2, ischial tuberosities; 3, anus; 4, penis. a,a' gluteus maximus.
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