Walls of pelvis minor, sagittal sections. A. Muscles and branches of pudendal nerve. Insert image indicates the direction of obturator internus.

Posterior view of the semispinalis and multifidus muscles of the back; splenius capitus and cervicis, semispinalis capitis, and erector spinae are cut away.

Transverse section of thigh. B. Diagram.

Blood supply of posterior aspect of the thigh, posterior view. A. Sciatic nerve.

Transverse (axial) MRIs of the female pelvis and perineum. B. Insert image indicates level of MRI.

Male pelvis. B. Transverse section through bladder. The insert image indicates level of dissection.

Partially detach and reflect the gluteus maximus muscle to expose the nerve and the vessels to the ischioanal fossa.

The reference line in the gluteal region is the readily defined inferior border of the piriformis muscle (P). The position of the glueus maximus is indicated by dotted lines.

Transverse (axial) MRIs of the male pelvis and perineum. B. Insert image indicates level of MRI.

Blood supply of posterior aspect of the thigh, posterior view. B. Profunda femoris artery. Observe the continous anastomotic chain of arteries.

Transverse (axial) MRIs of the male pelvis and perineum. A. Insert image indicates level of MRI.

Muscles of gluteal region and posterior aspect of thigh - II, posterior view. A. Muscles of gluteal region and posterior thigh with gluteus maximus reflected.

Gluteus maximus palpation