The names "superior gemellus" and "inferior gemellus" are precisely from its relations with the obturator internus muscle (Llusa et al., 2004).
There are reports in the literature describing bilateral absense of superior gemellus muscle (Terry; Bajka et al., 2004; Fernandes et al., 2013).
Wood (1867) reported bilateral absence of the superior gemellus muscle in 4.28 % of samples (3 of 102 corpses).
(2007) mentioned that the superior gemellus muscle can merge with the piriformis muscle or gluteus minimus muscle, and the inferior gemellus muscle can fuse with the quadratus femoris muscle.
In the study of Shinohara, in most cases, the superior gemellus muscle received a double innervation from quadratus femoris muscle nerve and obturator internus muscle nerve (12 of 14 corpses).
Terry, related the absence of the superior gemellus muscle with a decrease in the size of the ischial spine, which is not possible to verify in this case because the muscle was absent on both sides.
Double superior gemellus together with double piriformis and high division of the sciatic nerve.
Bilateral absence of superior gemellus muscle in elderly cadaver.
After articular capsule and short external rotators (Including piriformis, superior gemellus
, inferior gemellus, quadratus femoris) were reattached to the posterior border of the greater trochanter by several bone holes after replacement, one of our researchers, who did not involve in the operation and in evaluation of the results, was responsible for opening these envelopes and preparing the study medication.