When the communicating branch from the obturator nerve is large and continued to the integument of the leg, the posterior branch of the medial cutaneous is small, and terminates in the plexus, occasionally giving off a few cutaneous filaments.
12.
Behind the pectineus, it distributes branches to the adductor longus and gracilis, and usually to the adductor brevis, and in rare cases to the pectineus; it receives a communicating branch from the accessory obturator nerve when that nerve is present.
13.
The obturator nerve ( L2-L4 ) passes medially behind psoas major to exit the pelvis through the obturator canal, after which it gives off branches to quadriceps; and sensory branches to the anterior thigh, medial lower leg, and posterior foot.
14.
Below the knee, the branches of the saphenous nerve ( medial crural cutaneous branches ) are distributed to the skin of the front and medial side of the leg, communicating with the cutaneous branches of the femoral, or with filaments from the obturator nerve.
15.
Its smaller motor branches are distributed directly to psoas major, while the larger branches leave the muscle at various sites to run obliquely down through the pelvis to leave under the inguinal ligament, with the exception of the obturator nerve which exits the pelvis through the obturator foramen.
16.
The larger branches of the plexus exit the muscle to pass sharply downward to reach the abdominal wall and the thigh ( under the inguinal ligament ); with the exception of the obturator nerve which pass through the lesser pelvis to reach the medial part of the thigh through the obturator foramen.
17.
The following are relations of the artery at various points : it is posterior to the ureter, anterior to the internal iliac vein, the lumbosacral trunk, and the piriformis muscle; near its origin, it is medial to the external iliac vein, which lies between it and the psoas major muscle; it is above the obturator nerve.
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