ANAT 1615 Lecture Notes - Lower Extremity (Mercy Navis)

ANAT 1615 Lecture Notes - Lower Extremity (Mercy Navis) - 1...

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LOWER EXTREMITY Gluteal region Muscles Gluteus maximus, superficial, large muscle, arises from the iluim, posterior to the posterior gluteal line, dorsal surface of sacrum and coccyx and sacrotuberous ligament Insertion most of the fibers attach to the iliotibial tract and the remaining into the gluteal tuberosity Nerve supply by the inferior gluteal nerve ( L5, S1, S2 ) Actions 1. extension of thigh and assists in lateral rotation 2. steadies the thigh and assists in rising from sitting position Gluteus medius, lies deep to gluteus maximus, arises from the external surface of ilium, between anterior and posterior gluteal lines Insertion into the lateral surface of greater trochanter of femur Nerve supply by the superior gluteal nerve ( L4 L5 S1 ) Actions 1. abducts and medially rotate the thigh 2. keeps pelvis level when opposite leg is raised Gluteus minimus, lies deep to the gluteus medius, arises from the external surface of ilium, between the anterior and inferior gluteal lines Insertion into the anterior surface of the greater trochanter of femur Nerve supply by the superior gluteal nerve ( L4 L5 S1 ) Actions 1. abducts and medially rotate the thigh 2. keeps the pelvis level when opposite leg is raised Piriformis, lies inferior to gluteus minimus, arises from the anterior surface of sacrum and sacrotuberous ligament Insertion into the superior border of greater trochanter of femur Nerve supply by nerve to piriformis ( ventral rami of S1 S2 ) Actions 1. laterally rotates extended thigh 2. abducts flexed thigh 3. steadies femoral head in acetabulum Superior gamellus, lies inferior to piriformis, arises from the ischial spine 1
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Insertion into the medial surface of greater trochanter of femur Nerve supply by nerve to obturator internus ( L5 S1 ) Actions 1. laterally rotates extended thigh 2. abducts flexed thigh 3. steadies femoral head in acetabulum Obturator internus tendon lies between the superior and inferior gamelli muscles, arises from the pelvis surface of obturator membrane and surrounding bones Insertion into the medial surface of greater trochanter of femur Nerve supply by the nerve to obturator internus ( L5 S1) Actions 1. laterally rotates extended thigh 2. abducts flexed thigh 3. steadies femoral head in acetabulum Inferior gamellus, lies inferior to tendon of obturator internus, arises from the ischial tuberosity Insertion into the medial surface of greater trochanter of femur Nerve supply by the nerve to quadratus femoris ( L5 S1 ) Actions 1. laterally rotates extended thigh 2. abducts flexed thigh 3. steadies femoral head in acetabulum Quadratus femoris, lies inferior to inferior gamellus, arises from the lateral border of ischial tuberosity Insertion into the quadrate tubercle on the intertrochanteric crest of the femur Nerve supply by the nerve to quadratus femoris ( L5 S1 ) Action 1. laterally rotates the thigh 2. steadies femoral head in acetabulum Vessels and nerves in the gluteal region Superior gluteal nerve ( L4 L5 S1 ) runs above the superior border of piriformis, with the superior gluteal
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ANAT 1615 Lecture Notes - Lower Extremity (Mercy Navis) - 1...

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