Illustrated Encyclopedia of Human Anatomic Variation: Opus III: Nervous System
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
Number of extremities studied, 1510.
A: Usual relationships with the sciatic nerve passing from the pelvis beneath m. piriformis.
B: M. piriformis divided into two parts with the peroneal division of the sciatic nerve passing between the two parts of piriformis.
C: The peroneal division of the sciatic nerve passes over m. piriformis and the tibial division passes beneath the undivided muscle.
D: In these cases the entire nerve passes through the divided m. piriformis.
From Beaton, L.E. and B.J. Anson. The relation of the sciatic nerve and its subdivisions to the piriformis muscle. Anat. Rec. 70:1-5, 1938.
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