Internal obturator muscle

About the internal obturator muscle of the horse

Internal obturator muscle is a muscle of the back leg (pelvic limb), one on each side of the body. Its name in the Nomina Anatomica Veterinaria is Musculus obturatorius internus. You can turn it above, see it in place in the back leg of the horse, and open it inside the whole animal in Vetomica.

Where it runs from and to

A muscle is told apart from its neighbours by what it takes hold of at each end, which is also what decides what it does when it shortens.

Origin

The pelvic surface of the pubis and ischium around the obturator foramen, and the shaft of the ilium, inside the pelvic cavity.

Insertion

The trochanteric fossa of the femur, by a tendon over the lesser sciatic notch.

Action

Turns the thigh outward.

Nerve

The sciatic nerve.

Written for Vetomica in its own words from the standard reference anatomy of the horse; the books it was checked against are listed below.

Terminology

English

Internal obturator muscle

Latin (NAV)

Musculus obturatorius internus

Status

A valid term in the Nomina Anatomica Veterinaria

Questions about the internal obturator muscle

What is the Latin name of the internal obturator muscle?

In the Nomina Anatomica Veterinaria, the internal obturator muscle is called Musculus obturatorius internus.

Where is the internal obturator muscle of the horse?

Internal obturator muscle is a muscle of the back leg (pelvic limb), one on each side of the body.

Where does the internal obturator muscle originate and insert?

Origin: The pelvic surface of the pubis and ischium around the obturator foramen, and the shaft of the ilium, inside the pelvic cavity. Insertion: The trochanteric fossa of the femur, by a tendon over the lesser sciatic notch.

What nerve supplies the internal obturator muscle?

The sciatic nerve.

What does the internal obturator muscle do?

Turns the thigh outward.