In the image below, identify the muscle labelled by the letter B?

Question

BlackTom AI · Accepted Answer

The superior gemellus is a small deep lateral rotator of the hip that sits in the gluteal region just inferior to the piriformis and superior to the obturator internus tendon. It originates from the ischial spine and inserts with the tendon of the obturator internus onto the greater trochanter; functionally it laterally rotates the femur when the hip is extended and assists abduction when the hip is flexed.

Step-by-step identification:
1. Locate the labelled point B: it is in the deep gluteal area, close to the greater trochanter and adjacent to small, short muscles rather than large superficial masses. That anatomical zone contains the short external rotators (piriformis, superior and inferior gemelli, obturator internus, quadratus femoris).
2. Size and relation: B is a small muscle immediately above the tendon of the obturator internus and below the region where the piriformis would lie — the exact position of the superior gemellus (which arises from the ischial spine, superior to the obturator internus).
3. Shape and orientation: the gemelli are small, strap-like muscles running laterally to merge with the obturator internus tendon. The image shows such a small slip, not a large fan-shaped or long hamstring muscle.

Why the other options are incorrect:
- Adductor magnus: a large, broad, medial-thigh adductor along the femur’s medial side; it is not a small deep gluteal rotator and would not be positioned at B.
- Gluteus medius: a large, superficial fan-shaped muscle on the lateral ilium inserting on the greater trochanter; it is more superior and superficial than the deep small muscle at B.
- Semimembranosus: one of the hamstrings on the posterior thigh, broad and flat with a long tendon near the knee — anatomically remote from the deep lateral rotators.
Because the labelled muscle is a small deep lateral rotator sitting superior to the obturator internus tendon and inferior to the piriformis, the correct identification is superior gemellus. This matches the provided answer: superior gemellus.

In the image below, identify the muscle labelled by the letter B?单项选择题

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