KNOWLATIVE

Muscle

Semimembranosus

OriginIschial tuberosityInsertionMedial surface of shaft of tibiaActionsFlexes and slightly medially rotates leg; after flexion, extends thighNerveTibial portion of sciatic nerve (L5, S1,...

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Semitendinosus

OriginIschial tuberosityInsertionMedial surface of shaft of tibiaActionsFlexes and slightly medially rotates leg; after flexion, extends thighNerveTibial portion of sciatic nerve (L5, S1,...

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Biceps Femoris

Origin Long head—ischial tuberosity, sacrotuberous ligament Short head—linea aspera, lateral supracondylar ridge, lateral intermuscular septum InsertionLateral side of head of fibula and lateral...

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Quadratus Femoris

Origin Lateral border of ischial tuberosity Insertion Below intertrochanteric crest (quadrate line) Actions Laterally rotates thigh Nerve Branch from sacral plexus (L5, S1) Note

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Obturator externus

Origin Outer surface of superior and inferior rami of pubis and ramus of ischium surrounding obturator foramen Insertion Trochanteric fossa of femur Actions Laterally rotates thigh Nerve Obturator...

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Obturator Internus

Origin Pelvic surface of obturator membrane and surrounding bones (ilium, ischium, pubis) Insertion Common tendon with superior and inferior gemelli to medial surface of upper border of greater...

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Gemellus Inferior

Origin Upper margin of ischial tuberosity Insertion With tendon of obturator internus into medial surface of upper border of greater trochanter Actions Laterally rotates thigh Nerve Branch of nerve...

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Gemellus Superior

Origin Spine of ischium Insertion With tendon of obturator internus into medial surface of upper border of greater trochanter Actions Laterally rotates thigh Nerve Branch of nerve to obturator...

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Gluteus Minimus

Origin Outer surface of ilium between middle (anterior) and inferior gluteal lines Insertion Anterior surface of greater trochanter Actions Abducts femur, rotates thigh medially Nerve Superior...

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Pectineus

Origin Pectineal line on superior branch of pubis Insertion From lesser trochanter to linea aspera of femur Actions Flexes thigh, assists in adduction when hip is flexed Nerve Femoral nerve (L2,...

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Adductor Brevis

Origin Outer surface of inferior branch of pubis. Insertion From below lesser trochanter to linea aspera and into proximal part of linea aspera. Actions Adducts thigh, assists in flexion, medial...

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Adductor Longus

Origin Anterior of body of pubis. Insertion Medial lip of linea aspera of femur. Actions Adducts, flexes thigh, assists in medial rotation. Nerve Obturator nerve (L2–L4). Note The rotational...

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Adductor Magnus

Origin Inferior branch of pubis, branch and lower part of tuberosity of ischium. Insertion Linea aspera, adductor tubercle of femur. Actions Adducts, extends thigh, lower portion (adductor tubercle...

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Hamstrings – Group description

Origin Biceps Femoris: Long head—ischial tuberosity, sacrotuberous ligamentShort head—linea aspera, lateral supracondylar ridge, lateral intermuscular septum Semitendinosus: Ischial tuberosity...

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Tensor fasciae latae – Fascia lata

Origin Outer edge of iliac crest between anterior superior iliac spine and iliac tubercle Insertion Iliotibial tract on upper part of thigh. The iliotibial tract inserts at Gerdy's tubercle in the...

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