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Gluteal Post Thigh
module 12 anatomy
| Question | Answer |
|---|---|
| Gluteus Maximus Origin | ilium posterior and dorsal surface of sacrum |
| Gluteus Maximus Insertion | lateral condyle of tibia, gluteal tuberosity of femur |
| Gluteus Maximus Nerve | inferior gluteal nerve (L5, S1, S2) |
| Gluteus Maximus Action | extends thigh, assists lateral rotation |
| Gluteus Medius Origin | ext surface of ilium bw anterior and posterior gluteal lines |
| Gluteus Medius Insertion | lateral surface of greater trochanter of femur |
| Gluteus Medius Nerve | superior gluteal nerve (L5, S1) (same as gluteus minimus) |
| Gluteus Medius Action | ABducts and laterally rotates thigh; keeps pelvis level when opposite leg is raised |
| Gluteus Minimus Origin | ext surface of ilium bw anterior surface of ilium bw ant and inf gluteal lines |
| Gluteus Minimus Insertion | anterior surface of greater trochanter of femur |
| Gluteus Minimus Nerve | Superior gluteal nerve (L5, S1) |
| Gluteus Minimus Action | ABducts and medially rotates thigh; keeps pelvis level when opposite leg raised |
| Piriformis Origin | anterior surface of sacrum and sacrotuberous ligament |
| Piriformis Insertion | piriformis fossa |
| Piriformis Nerve | branches of ventral rami of S1, S2 |
| Piriformis Action | Laterally rotates extended thigh; ABducts flexed thigh; steady femoral head in acetabulum |
| Obturator Internus Origin | pelvic surface of obturator membrane |
| Obturator Internus Insertion | trochanteric fossa of femur |
| Obturator Internus Nerve | nerve to obturator internus (L5, S1) |
| Obturator Internus Action | Lateral rotation extended thigh, ABduction in flexed thigh, steady femoral head in acetabulum |
| Gemellus Superior Origin | Ischial Spine |
| Gemellus Superior Insertion | blends with obturator internus tendo to attach to greater trochanter of femur |
| Gemellus Superior Nerve | Nerve to obturator internus (L5, S1) |
| Gemellus Superior Action | Laterally rotates extended thigh; abducts flexed thigh; steadies femoral head in acetabulum |
| Gemellus Inferior Origin | ischial tuberosity |
| Gemellus Inferior Insertion | gemellus blends with obturator internus tendon and attaches to greater trochanter of femur |
| Gemellus Inferior Nerve | nerve to quadratus femoris (L5, S1) |
| Gemellus Inferior Action | laterally rotates extended thigh and abducts flexed thigh; steadies femoral head in acetabulum |
| Quadratus Femoris Origin | lateral border of ischial tuberosity |
| Quadratus Femoris Insertion | quardate tubercle on introchanteric crest of femur and area inferior to it |
| Quadratus Femoris Nerve | nerve to quadratus femoris (L5, S1) |
| Quadratus Femoris Action | laterally rotates extended thigh and abducts flexed thigh; steadies femoral head in acetabulum |
| Obturator Externus Origin | margins of obturator foramen and obturator membrane |
| Obturator Externus Insertion | trochanteric fossa of femur |
| Obturator Externus Nerve | obturator nerve (L3, L4) |
| Obturator Externus Action | laterally rotates extended thigh and abducts flexed thigh; steady femoral head in acetabulum |
| Biceps Femoris - Long Head Origin | ischial tuberosity |
| Biceps Femoris - Long Head Insertion | lateral side of head of fibula; tendon is split by fibular collateral knee ligament |
| Biceps Femoris - Long Head Nerve | sciatic nerve (L5, S1, S2) |
| Biceps Femoris - Long Head Action | flexes leg and rotates it laterally when knee flexed; extends thigh at hip joint |
| Semitendinosus Origin | ischial tuberosity |
| Semitendinosus Insertion | medial surface of superior part of tibia |
| Semitendinosus Nerve | sciatic nerve (L5, S1, S2) |
| Semitendinosus Action | extend thigh; flex leg and rotate it medially with knee flexed |
| Semimembranosus Origin | ischial tuberosity |
| Semimembranosus Insertion | posterior part of medial tibial condyle; reflective attachment forms oblique popliteal ligament to lateral femoral condyle |
| Semimembranosus Nerve | Sciatic nerve (L5, S1, S2) |
| Semimembranosus Action | extends thigh, flexes leg and rotate it medially with knee flexed |
| Adductor Magnus Origin | adductor part: inferior ramus of pubis, ramus of ischium; hamstring part: ischial tuberosity |
| Adductor Magnus Insertion | adductor part: gluteal tuberosity, linea aspera, medial supracondylar line hamstring part: adductor tubercle of femur |
| Adductor Magnus Nerve | adductor part: obturator nerve (L2, L3, L4) hamstring part: sciatic nerve (L4) |
| Adductor Magnus Action | adductor part: adducts thigh; adductor part; flexes thigh hamstring part: extends thigh |
| What are the muscles of the gluteus region? | gluteus maximus, gluteus minimus, gluteus medius, piriformis, obturnator internus, superior gemellus, inferior gemellus, quadratus femoris, obturator exturnus |
| What are the muscles of the hamstrings? | biceps femoris - long head, biceps femoris - short head, semimembranosus, semitendinosus |
| Which of the hamstrings does not cross both the hip and knee? | biceps femoris - short head |
| Which of the hamstrings is not innervated by the tibial division of the sciatic nerve? | biceps femoris - short head |
| What muscles laterally rotate extended thigh, abduct flexed thigh, and steady femoral head in acetabulum? | Piriformis, obturator internus, gemellus superior and gemellus inferior |
| Biceps Femoris - Short Head Origin | linear aspera and lateral and lateral supracondylar line of femur |
| Biceps Femoris - Short Head Insertion | lateral side of head of fibula; tendon is split by fibular collateral knee ligament |
| Biceps Femoris - Short Head Nerve | sciatic nerve - L5, S1, S2 |
| Biceps Femoris - Short Head Action | flexes leg and rotates it laterally |