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Thigh Muscles/Innerv

Musculature/Innervation Review of the Thigh PTA

QuestionAnswer
Psoas Major Origin:bodies of discs of T12-L5. Insertion:lesser trocanter. Nerve:L2,3 Action:flexes and laterally rotates thigh at hip, flexes vertebral column (Torso)
Psoas Minor Bodies of discs of T12 and L1.Insertion: pectinial line of superior pubic bone. Nerve: L2,3 Action:weak trunk flexer.
Iliacus Origin:upper 2/3 Iliac fossa. Insertion:lessor trochantor.Nerve:L2-4. Action: flexes & laterally rotates thigh @ hip.
Pectinius Origin: pubic ramus. Insertion: spiral line.Nerve Femoral. Action: adducts and flexes hip at thigh.
Iliopsoas Origin:joining of Psoas Major and Iliacus. Insertion:lesser trochanter. Nerve:L2-4. Action: flexion of hip
Piriformis Origin: anterior surface of sacrum. Insertion: greater trochanter. Nerve: sacral plexus. Action: lateraly rotates thigh at hip; also abducts thigh if hip is flexed.
Obturator Internus Origin: inner surface of obturater membrane. Insertion: greater trochanter. Nerve: sacral plexus. Action: abducts & rotates laterally thigh,and stabiliser of the hip during walking.
Obturator Externus Origin: outer surface of the obturator membrane. Insertion: greater trochanter. Nerve: Obturator. Action: adducts thigh, laterally rotates thigh.
Gemellus Superior Origin: ischial spine. Insertion: greater trocantor. Nerve: sacral plexes. Action: rotates thigh laterally.
Gemellus Inferior Origin: ischial tuberosity. Insertion: greater trochantor. Nerve: sacral plexus. Action: rotates thigh laterally.
Quadratus Femoris Origin: ischial tuberosity. Insertion: quadrate tubercle of the femur. Nerve: sacral plexus.Action:laterally rotates and helps adduct the thigh at hip.
Gluteus Maximus Origin: outer surface of Illium, sacrum and coccyx. Insertion: Iliotibial tract,gluteal tubercle of the femur. Nerve: inferior gluteal. Action: extends, laterally rotates thigh @ hip;helps abduct the thigh.
Gluteus Medius Origin: outer surface of ilium. Insertion: greater trochanter. Nerve: superior gluteal. Action: Abducts thigh @ hip;anterior fibers medially rotate thigh;posterior fibers lateraly rotate hip @ thigh.
Gluteus Minimus Origin: outer surface of ilium. Insertion: greater trochanter. Nerve: superior gluteal. Action: abducts thigh @ hip;anterior fibers medially rotate thigh.
Sartorius Origin:anterior illiac spine. Insertion:just below medial condyle of tibia. Nerve:femoral. Action: flexes and laterally rotates thigh @ hip;also flexes leg @ knee.
Quadradus Femoris Origin: just above ischial tuberosity. Insertion:tibial tuberosity. Nerve: femoral L5,S1. Action: lateral rotation and adduction of thigh.
Gracilis Origin: pubic bone. Insertion: upper medial tibia. Nerve: obturator L3,L4(anterior branch). Action: adducts hip @ thigh,also flexes leg @ knee and medially rotates leg when knee is flexed.
Adducter Longus Origin:pubic bone. Insertion: Linea Aspera. Nerve:Obturator (anterior branch)L3 L4. Action:adducts thigh and assists in lateral rotation.
Adductor Brevis Origin: pubic bone. Insertion: Linea Aspera. Nerve: Obturator (anterior branch)L3 L4. Action: Adducts thigh and assists in lateral rotation.
Adductor Magnus Origin: pubic bone. Insertion: linea aspera. Nerve: Sciatic (L2-L4), Obturator(L2-L4)Action: Oblique head, adducts and flexes thigh. Vertical head;extends thigh @ hip.
Tenser Fascia Latae Origin: iliac crest. Insertion: iliotibial band. Nerve: sciatic-tibial. Action: abducts and flexes thigh @ hip.
Biceps Femoris Origin: ichial tuberosity. Insertion: head of fibula,lateral condyle of tibia. Nerve: sciatic-tibial portion& common peroneal. Action: extends thigh @ hip. Flexes leg @ knee and laterally rotataes leg if knee is flexed.
Semi Membranosus Origin: ischial tuberosity. Insertion: upper medial tibia. Nerve: Sciatic-Tibial portion L5,S1,S2. Action: Extends hip @ thigh.also flexes leg @ knee and medially rotates leg if knee is flexed.
Semitendinosus Origin: ischial tuberosity. Insertion: upper medial Tibia. Nerve: Sciatic-Tibial portion,L5,S1,S2. Action: extends thigh @ hip. It also flexes leg @ knee and medially rotates leg if knee is flexed.
Created by: dwylinmiller