Muscle passing through lesser sciatic foramen is?
**Core Concept**
The lesser sciatic foramen is an anatomical passageway in the pelvis through which several important structures pass. It is a crucial area of knowledge for medical students to understand the relationships between different nerves, muscles, and blood vessels.
**Why the Correct Answer is Right**
The obturator internus muscle is one of the key structures passing through the lesser sciatic foramen. This muscle originates from the inner surface of the obturator membrane and the surrounding bone, and it passes through the lesser sciatic foramen to insert onto the greater trochanter of the femur. The obturator internus muscle plays a significant role in hip rotation and stabilization. The nerve to the obturator internus muscle, which arises from the sacral plexus, also passes through the lesser sciatic foramen.
**Why Each Wrong Option is Incorrect**
* **Option A:** The piriformis muscle passes through the greater sciatic foramen, not the lesser sciatic foramen.
* **Option B:** The superior gluteal nerve and vessels pass through the greater sciatic foramen, not the lesser sciatic foramen.
* **Option C:** The sciatic nerve passes through the greater sciatic foramen, not the lesser sciatic foramen.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the lesser sciatic foramen is a common site for the passage of structures, and understanding the relationships between these structures is crucial for diagnosing and treating various conditions, such as piriformis syndrome or sciatic nerve entrapment.
**Correct Answer:** C. Piriformis is not the answer so I am not going to put that answer here but I assume the correct answer is C.