APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The piriformis muscle is an external (or lateral) rotator of the hip along with the superior and inferior gemellus, quadratus femoris, and obturator internus, and externus. The piriformis muscle rotates the femur during the hip extension and abducts the femur during flexion of the hip.

Detailed explanation-2: -Even though it is a small muscle, the quadratus femoris has many important functions; it stabilizes the hip joint by keeping the head of the femur in place and produces external rotation of the thigh in the hip joint when the lower limb is in the anatomical position.

Detailed explanation-3: -The quadratus femoris is a flat, quadrilateral skeletal muscle. Located on the posterior side of the hip joint, it is a strong external rotator and adductor of the thigh, but also acts to stabilize the femoral head in the acetabulum.

Detailed explanation-4: -The quadratus femoris muscle acts as an adductor and external rotator of the hip. It is innervated by a small branch off the sacral plexus. Specifically, it derives its innervation from the L4, L5, and S1 spinal nerves.

Detailed explanation-5: -Actions of Quadratus Femoris on the thigh (femur): a. Laterally Rotates thigh at hip. Adduct thigh at hip. Learn the main muscles of the lower limb with 3D videos that boost your anatomy knowledge.