Atziri Mendoza
Anatomy, period D
Assignment 2
15 March 2013
Questions 11.19, 11.20, 11.21
MUSCLES OF THE GLUTEAL REGION THAT MOVE THE FEMUR
Iliopsoas & Psoas major * ORIGIN: Transverse processes and bodies of lumbar vertebrae. * INSERTION: With iliacus into lesser trochanter of femur. * ACTION: Psoas major and iliacus muscles acting together flex thigh at hip joint, rotate thigh laterally, and flex trunk on hip as in sitting up from supine position. * INNERVATION: Lumbar spinal nerves L2–L3.
Iliacus
* ORIGIN: Iliac fossa and sacrum. * INSERTION: With psoas major into lesser trochanter of femur. * INNERVATION: Femoral nerve.
Gluteus maximus * ORIGIN: Iliac crest, sacrum, coccyx, and aponeurosis of sacrospinalis. * INSERTION: Iliotibial tract of fascia lata and superior lateral part of linea aspera under greater trochanter of femur. * ACTION: Extends thigh at hip joint and laterally rotates thigh; helps lock knee in extension. RMA: Extends torso. * INNERVATION: Inferior gluteal nerve.
Gluteus medius * ORIGIN: Ilium. * INSERTION: Greater trochanter of femur. * ACTION: Abducts thigh at hip joint and medially rotates thigh. * INNERVATION: Superior gluteal nerve.
Gluteus minimus * ORIGIN: Ilium. * INSERTION: Greater trochanter of femur. * ACTION: Abducts thigh at hip joint and medially rotates thigh. * INNERVATION: Superior gluteal nerve.
Tensor fasciae latae * ORIGIN: Iliac crest. * INSERTION: Tibia by way of iliotibial tract. * ACTION: Flexes and abducts thigh at hip joint. * INNERVATION: Superior gluteal nerve.
Piriformis
* ORIGIN: Anterior sacrum. * INSERTION: Superior border of greater trochanter of femur. * ACTION: Laterally rotates and abducts thigh at hip joint. * INNERVATION: Sacral spinal nerves S1 or S2, mainly S1.
Obturator internus * ORIGIN: Inner surface of obturator foramen, pubis, and ischium. * INSERTION: Medial surface of greater trochanter of femur. * ACTION: Laterally rotates and abducts thigh at hip joint. * INNERVATION: Nerve to obturator internus.
Obturator externus * ORIGIN: Outer surface of obturator membrane. * INSERTION: Deep depression inferior to greater trochanter of femur. * ACTION: Laterally rotates and abducts thigh at hip joint. * INNERVATION: Obturator nerve.
Superior gemellus * ORIGIN: Ischial spine. * INSERTION: Medial surface of greater trochanter of femur. * ACTION: Laterally rotates and abducts thigh at hip joint. * INNERVATION: Nerve to obturator internus.
Inferior gemellus * ORIGIN: Ischial tuberosity. * INSERTION: Medial surface of greater trochanter of femur. * ACTION: Laterally rotates and abducts thigh at hip joint. * INNERVATION: Nerve to quadratus femoris.
Quadratus femoris * ORIGIN: Ischial tuberosity. * INSERTION: Elevation superior to mid-portion of intertrochanteric crest on posterior femur. * ACTION:Laterally rotates and stabilizes hip joint. * INNERVATION: Nerve to quadratus femoris.
Adductor longus * ORIGIN: Pubic crest and pubic symphysis. * INSERTION: Linea aspera of femur. * ACTION: Adducts and flexes thigh at hip joint and rotates thigh. RMA: Extends thigh. * INNERVATION: Obturator nerve.
Adductor brevis * ORIGIN: Inferior ramus of pubis. * INSERTION: Superior half of linea aspera of femur. * ACTION: Adducts and flexes thigh at hip joint and rotates thigh. RMA: Extends thigh. * INNERVATION: Obturator nerve.
Adductor magnus * ORIGIN: Inferior ramus of pubis and ischium to ischial tuberosity. * INSERTION: Linea aspera of femur. * ACTION: Adducts thigh at hip joint and rotates thigh; anterior part flexes thigh at hip joint, and posterior part extends thigh at hip joint. * INNERVATION: Obturator and sciatic nerves.
Pectineus
* ORIGIN: Superior ramus of pubis. * INSERTION: Pectineal line of femur,