Human obturator nerve: Gross anatomy

Figure 1 The left obturator nerve arising from the ventral divisions of the L3 and L4 spinal nerves. The contribution of the ventral division of the L2 spinal nerve is absent. a: Ventral division of the L3 spinal nerve; b: Ventral division of the L4 spinal nerve; c: Obturator nerve.

Figure 2 A muscular mass of the left obturator externus muscle intervening between obturator nerve’s anterior and posterior branches, as the latter exits the obturator canal. a: Anterior branch of the obturator nerve; b: Posterior branch of the obturator nerve; c: Obturator externus muscle.