Moving forward, and onto the hip lateral rotators we will start with the piriformis. It is a pyramidal muscle located on the posterior aspect of hip joint, and inferior to gluteus minimus. It originates at the anterolateral surface of the sacrum, and inserts at the superior border of greater trochanter of femur. It rotates the extended thigh laterally. Also, because it is inserted above the head of femur it also assist in abduction of thigh when hip is flexed. It is responsible for stabilizing the hip joint.
The obturator externus is a flat triangular muscle deep in the upper medial aspect of the thigh. It originates on the outer surface of obturator membrane, external surface of pubis and ischium, as well as margins of obturator foramen. Insertion is by a tendon into trochanteric fossa of posterior femur. The obturator externus works along side the piriformis.
Obturator internus surrounds the obturator foramen within pelvis. It leaves the pelvis via lesser sciatic notch, and turns acutely forward to insert on femur. Insertion is at the inner surface of obturator membrane. It also works synergistically with piriformis.
The gemellus consists of two small muscles with common insertions and actions, considered extrapelvic portions of obturator internus. It originates at the ischial spine (superiorly), ischial tuberosity (inferior), and inserts at the greater trochanter of femur. Once again this muscle is a synergist to the piriformis.
Quadratus femoris is a short thick muscle, the most inferior of lateral rotator muscles, and extends lateraly from pelvis. It originates at ischial tuberosity, and inserts at the introtrochanteric crest of femur. Rotates thigh laterally and stabilizes the hip joint.
This article was researched and written by Carlos Flores – @_FloFitness
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