Lower Extremity Muscles Actions, Origins & Insertions

Front

Action: Adducts Thigh (ALL THREE!!) Insertion: Posterior Shaft of the Femur (ALL THREE!!) Origin: Inf. Rami Pubis + Isch. Rami AND ISCHIAL TUBEROSITY (Only one!!)

Back

Adductor Magnus

Front

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!)

Back

Rectus Femoris

Front

Action: Abducts thigh Insertion: Greater Trochanter Origin: Outer surface of the ilium

Back

Both Gluteus Medius & Gluteus Minimus

Front

Origin: Dorsal Ilium, sacrum, coccyx Insertion: Gluteal tuberosity of Femur Action: THIGH EXTENSION!!!

Back

Gluteus Maximus

Front

Tensor Fascia Latte: Origin, Insertion, Action

Back

Origin: Iliac Crest, Insertion: Iliotibial Tract, Action: Abducts the thigh

Front

Action: Lateral Rotator of the thigh (ALL FIVE!!) Insertion: Greater trochanteric fossa (ALL FIVE!!) Origin: Anterior surface of the sacrum (only one!!) Options: Piriformis, Inferior Gemellus, Superior Gemellus, Obturator Internus, Obturator Externus

Back

Piriformis

Front

Which muscle is a lateral rotator of the thigh, inserts at the greater trochanteric fossa, and originates from the spine of the ischium? Options: Piriformis, Inferior Gemellus, Superior Gemellus, Obturator Internus, Obturator Externus

Back

Superior Gemellus

Front

Action: Lateral Rotator of the thigh (ALL FIVE!!) Insertion: Greater trochanteric fossa (ALL FIVE!!) Origin: ischial tuberosity (only one!!) Options: Piriformis, Inferior Gemellus, Superior Gemellus, Obturator Internus, Obturator Externus

Back

Inferior Gemellus

Front

Action: Lateral Rotator of the thigh (ALL FIVE!!) Insertion: Greater trochanteric fossa (ALL FIVE!!) Origin: internal surface of obturator membrane (only one!!)

Back

Obturator Internus

Front

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

Back

Obturator Externus