Lower Extremity Muscles Actions, Origins & Insertions

Action: Adducts Thigh (ALL THREE!!)

Insertion: Posterior Shaft of the Femur (ALL THREE!!)

Origin: Inf. Rami Pubis + Isch. Rami AND ISCHIAL TUBEROSITY (Only one!!)

• Adductor Longus

• Adductor Brevis

• Adductor Magnus

• Don't choose this one!

Insertion: Quadriceps tendon / Patellar tendon / Tibial Tuberosity (ALL FOUR!)

Action: Knee Extension (ALL FOUR)

Origin: AIIS (ONLY ONE!! Other three are shaft of the femur!)

• Rectus Femoris

• Vastus Intermedius

• Vastus Lateralis

• Vastus Medius

Action: Abducts thigh

Insertion: Greater Trochanter

Origin: Outer surface of the ilium

• Gluteus Minimis

• Gluteus Medius

• Both Gluteus Medius & Gluteus Minimus

• Don't click here!

Origin: Dorsal Ilium, sacrum, coccyx

Insertion: Gluteal tuberosity of Femur

Action: THIGH EXTENSION!!!

• Gluteus Medius

• Gluteus Maximus

• Gluteus Minimis

• Choose a different one.

Tensor Fascia Latte

• Origin: Iliac Crest

• Insertion: Iliotibial Tract

• Action: Abducts the thigh

• All three are correct

Action: Lateral Rotator of the thigh (ALL FIVE!!)

Insertion: Greater trochanteric fossa (ALL FIVE!!)

Origin: Anterior surface of the sacrum (only one!!)

• Piriformis

• Inferior Gemellus

• Superior Gemellus

• Obturator Internus

• Obturator Externus

Action: Lateral Rotator of the thigh (ALL FIVE!!)

Insertion: Greater trochanteric fossa (ALL FIVE!!)

Origin: Spine of the ischium (only one!!)

• Piriformis

• Inferior Gemellus

• Superior Gemellus

• Obturator Internus

• Obturator Externus

Action: Lateral Rotator of the thigh (ALL FIVE!!)

Insertion: Greater trochanteric fossa (ALL FIVE!!)

Origin: ischial tuberosity (only one!!)

• Piriformis

• Inferior Gemellus

• Superior Gemellus

• Obturator Internus

• Obturator Externus

Action: Lateral Rotator of the thigh (ALL FIVE!!)

Insertion: Greater trochanteric fossa (ALL FIVE!!)

Origin: internal surface of obturator membrane (only one!!)

• Piriformis

• Inferior Gemellus

• Superior Gemellus

• Obturator Internus

• Obturator Externus

Action: Lateral Rotator of the thigh (ALL FIVE!!)

Insertion: Greater trochanteric fossa (ALL FIVE!!)

Origin: external surface of obturator membrane (only one!!)

• Piriformis

• Inferior Gemellus

• Superior Gemellus

• Obturator Internus

• Obturator Externus