muscles of the thigh

Iliopsoas — Anterior thigh

Origin: lumbar vertebrae & ilium;

Insertion: lesser trochanter;

Actions: hip flexion, lateral rotation;

Innervation: femoral n.

Rectus femoris — Anterior thigh

Origin: AIIS

Insertion: tibial tuberosity (via quadriceps tendon);

Actions: hip flexion, knee extension;

Innervation: femoral n.

Vastus lateralis — Anterior thigh (green)

Origin: proximal femur;

Insertion: tibial tuberosity (via quadriceps tendon);

Actions: knee extension;

Innervation: femoral n.

Vastus intermedius — Anterior thigh (purple)

Origin: shaft of femur;

Insertion: tibial tuberosity (via quadriceps tendon);

Actions: knee extension;

Innervation: femoral n.

Vastus medialis — Anterior thigh (orange)

Origin: proximal femur;

Insertion: tibial tuberosity (via quadriceps tendon);

Actions: knee extension;

Innervation: femoral n.

Sartorius — Anterior thigh

Origin: ASIS;

Insertion: pes anserinus (tibia);

Actions: hip flexion, knee flexion, lateral rotation;

Innervation: femoral n.

Pectineus — Medial thigh (green)

Origin: pubis;

Insertion: proximal femur;

Actions: hip adduction, flexion, lateral rotation;

Innervation: femoral & obturator n. (variable)

Adductor longus — Medial thigh (blue)

Origin: pubis;

Insertion: linea aspera;

Actions: hip adduction;

Innervation: obturator n.

Adductor brevis — Medial thigh (orange) 

Origin: pubis;

Insertion: linea aspera;

Actions: hip adduction;

Innervation: obturator n.

Gracilis — Medial thigh (purple) 

Origin: ischiopubic ramus;

Insertion: pes anserinus (tibia);

Actions: hip adduction, knee flexion;

Innervation: obturator n.

Adductor magnus (adductor part) — Medial thigh (red)

Origin: ischiopubic ramus;

Insertion: linea aspera;

Actions: hip adduction;

Innervation: obturator n.

Adductor magnus (hamstring part) — Medial thigh

Origin: ischial tuberosity;

Insertion: adductor tubercle;

Actions: hip extension;

Innervation: sciatic n. (tibial division)

Semimembranosus — Posterior thigh

Origin: ischial tuberosity;

Insertion: medial tibia;

Actions: hip extension, knee flexion;

Innervation: sciatic n.

(green)

Semitendinosus — Posterior thigh (orange) 

Origin: ischial tuberosity;

Insertion: pes anserinus (tibia);

Actions: hip extension, knee flexion;

Innervation: sciatic n.

Biceps femoris (long head) — Posterior thigh 

Origin: ischial tuberosity;

Insertion: head of fibula;

Actions: hip extension, knee flexion;

Innervation: sciatic n. (tibial division)

Biceps femoris (short head) — Posterior thigh (purple) 

Origin: linea aspera;

Insertion: head of fibula;

Actions: knee flexion;

Innervation: sciatic n. (common fibular division)