Bassett Collection of Stereoscopic Images of Human Anatomy

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Male external genitalia and perineum

Superficial fascia reflected; posterior scrotal nerves and vessels; deep perineal fascia

Image #166-3

KEYWORDS: Peripheral nervous system, Vasculature.

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Male external genitalia and perineum

Superficial fascia reflected; posterior scrotal nerves and vessels; deep perineal fascia

The dartos has been split close to the midline at the base of the scrotum. The incision has been extended posteriorly through the membranous layer of superficial fascia (Colles' fascia). This layer has been retracted on the left side to reveal the major branches of the posterior scrotal nerves and artery. The perineal branch of the posterior femoral cutaneous nerve (10) passes anteriorly to join the plexiform branches of the posterior scrotal nerves (13). Note also that the posterior scrotal nerves communicate across the midline with branches derived from nerves of the opposite side. The adductor muscles of the left thigh have been cut away to expose the obturator externus (15). The rami of the pubis and ischium have been stripped of periosteum on the left.

1 .	Body of penis (covered by superficial penile fascia)
2 .	Dartos fascia (enclosing right testis)
3 .	Septum of scrotum (compressed against penis and divided in reflecting parts of scrotum)
4 .	Deep perineal fascia (Buck's fascia)
5 .	Superficial perineal fascia (reflected laterally)
6 .	Gracilis muscle
7 .	Posterior border of area enclosed by superficial perineal fascia
8 .	Anus
9 .	Perineal branch of inferior rectal nerve
10 .	Perineal branch posterior femoral cutaneous nerve
11 .	Ischial tuberosity
12 .	Dartos fascia (enclosing atrophic left testis)
13 .	Branches of posterior scrotal nerves
14 .	Superficial perineal fascia
15 .	Obturator externus muscle
16 .	Posterior scrotal branch internal pudendal artery
17 .	Ramus of ischium (periosteum removed)