Inner Pelvic Muscles - Horse Anatomy

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The inner pelvic muscles are small and lie close to the coxafemoral (hip) joint. They run between the pelvis and trochanteric fossa of the femur.

Internal Obturator

In the horse this muscle has two heads, a small and tendinous pubic head and a larger pelvic head.
Innervation: Sciatic n.
Origin:
Pubic head - Cranial and medial borders of the obturator foramen
Pelvic head - Pelvic symphysis and pelvic aspect of the body of the ilium
Insertion: Trochanteric fossa together with the gemellus muscle, having passed over the lesser sciatic notch
Action: Rotates the femur laterally, aids hip extension

External Obturator

Innervation: Obturator n.
Origin: Ventral surface of pelvis, close to the obturator foramen
Insertion: Trochanteric fossa
Action: Supinates the femur and adducts the limb

Gemellus

In the horse, these two small muscle bundles are fused and unite partly with the internal obturator muscle
Innervation: Sciatic n.
Origin: Ischium
Insertion: Trochanteric fossa
Action: Aids lateral rotation of the limb