Pectineus Anatomy

Pectineus Muscle

Origin: Pectineal line of the pubis the superior pubic ramus
Insertion: The lesser trochanter to the linea aspera
Actions: Assists with flexion and adduction of the thigh
Innervation: Anterior division of the femoral nerve (L2. L3). Occasionally the obturator nerve (L2, L3)
Blood Supply: Branches from the internal iliac and profunda femoris arteries

Primary Actions of the Pectineus

1. Because of its size, the pectineus does not have a prime action, it assists other muscles.

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Secondary Actions of the Pectineus

1. Assists with flexion of the thigh at the hip
Agonists:

  • Psoas major
  • Iliacus

Antagonists:

  • Gluteus maximus
  • Semitendinosus
  • Semimembranosus
  • Biceps femoris (long head)
  • Adductor magnus (posterior part)

Rectus femorissartorius, and psoas minor also assist with flexion of the thigh at the hip.

2. Assists with adduction of the thigh at the hip

Agonists:

  • Adductor longus
  • Adductor brevis
  • Adductor magnus (anterior part)

Antagonists:

  • Gluteus maximus (upper fibers)
  • Gluteus medius
  • Gluteus minimus

Gracilis also assists with adduction of the thigh at the hip.