Origins, insertions + actions of muscles in the pelvis

Question 1

Iliacus

Answer 1

Origin: Iliac crest.
Insertion: Lesser trochanter.
Action: Hip flexion + Medial rotation.
NS: Femoral Nerve.
BS: N/A.

Question 2

Psoas major

Answer 2

Origin: Transverse processes L1-L5 + Vertebral bodies T12-L5.
Insertion: Lesser trochanter.
Action: Hip flexion + Medial rotation.
NS: Lumbar Plexus.
BS: N/A.

Question 3

Psoas minor

Answer 3

Origin: Vertebral bodies T12-L1.
Insertion: Superior pubic ramus.
Action: Functionally insignificant.
NS: Lumbar Plexus.
BS: N/A.

Question 4

Obturator internus

Answer 4

Origin: Obturator membrane.
Insertion: Greater trochanter.
Action: Lateral rotation.
NS: Sacral Plexus.
BS: Superior Gluteal artery.

Question 5

Pubococcygeus

Answer 5

Origin: Posterior surface of pubic body + tendinous arch of lavator ani.
Insertion: Coccyx + perineal body.
Action: Stabalises + supports abdominal + pelvic organs.
NS: N/A.
BS: N/A.

Question 6

Iliococcygeus

Answer 6

Origin: Ischial spine.
Insertion: Coccyx.
Action: Stabalises + supports abdominal + pelvic organs.
NS: N/A.
BS: N/A.

Question 7

Ischiococcygeus

Answer 7

Origin: Ischial spine.
Insertion: Coccyx.
Action: Stabalises + supports abdominal + pelvic organs.
NS: N/A.
BS: N/A.

Question 8

Superior gamellus

Answer 8

Origin: Ischial spine.
Insertion: Greater trochanter.
Action: Lateral rotation.
NS: Sacral Plexus.
BS: Inferior Gluteal Nerve.

Question 9

Inferior gamellus

Answer 9

Origin: Ischial tuberosity.
Insertion: Greater trochanter.
Action: Lateral rotation.
NS: Sacral Plexus.
BS: Inferior Gluteal Nerve.

Question 10

Piriformis

Answer 10

Origin: Sacrum + sacrotuberous ligament.
Insertion: Greater trochanter.
Action: Abduction + Lateral rotation.
NS: Sacral Plexus.
BS: Superior Gluteal Artery.

Question 11

Gluteus Minimus

Answer 11

Origin: Anterior + inferior gluteal lines of ilium.
Insertion: Greater trochanter.
Action: Flexion, abduction + Medial rotation.
NS: Superior Gluteal Nerve.
BS: Superior Gluteal Artery.

Question 12

Gluteus Medius

Answer 12

Origin: Anterior + posterior gluteal lines of ilium.
Insertion: Greater trochanter.
Action [ANT]: Flexion, Abduction + Medial rotation.
[POST]: Extension, Abduction + Lateral rotation.
NS: Superior Gluteal Nerve.
BS: Superior Gluteal artery.

Question 13

Gluteus Maximus

Answer 13

Origin: Dorsal ilium, sacrum, coccyx + sacrotuberous ligament.
Insertion: Gluteal tuberosity of the femur.
Action [UP]: Extend, Abduct + Lateral rotation.
[LO]: Extend, Adduct + Lateral Rotation.
NS: Inferior Gluteal Nerve.
BS: Inferior Gluteal artery.