THE MALE GENITAL SYSTEM
Male genital system includes the testes, vas deferens, seminal vesicles
and ejaculatory ducts. Male external genitalia comprise the scrotum and the
The Scrotum is the downward prolongation of the anterior abdominal
wall. It lodges the following structures
It protects the testes from external violence and maintains a
temperature which is lower than that of the abdomen. The scrotum is
bilateral in development and is formed by the fusion of two genital
swellings. The fusion is represented by a median raphe which is continuous
with a similar raphe on the ventral surface of the penis and on the perineum.
Left half of the scrotum is slightly lower than the right half for
accommodation of the elongated left spermatic cord.
Scrotum has many layers
3.External spermatic fascia
4. Cremasteric muscle and fascia
5. Internal spermatic fascia
6.Tunica vaginalis testis.
The skin is thin and transparent and elastic. So it allows distensions.
This is the continuation of the superficial fascia of the anterior
THE EXTERNAL SPERMATIC FASCIA
It is derived from the aponeurosis of the external oblique abdominis.
Cremasteric muscle and fascia
It is derived from the internal oblique abdominis. The cremaster
muscle is supplied by the genital branch of the genito femoral nerve.
The internal spermatic fascia
It is derived from the transverse abdominis muscle.
The tunicavaginalis testis
It is situated deep to the internal spermatic fascia. It is derived from
the processus vaginalis. Before birth, it communicates with the peritoneal
cavity. Just before birth, it separates and its communication with the
peritoneal cavity is closed.
It covers the anterior, lateral, medial and a part of posterior surfaces of
the testis. It has two layers namely visceral and parietal layers.
Embryologically it is invaginated by the testis from behind.
1.Superficial external pudendal artery
2.Deep external pudendal artery
3.Posterior scrotal artery from the internal pudendal artery
4.Cremasteric artery from inferior epigastric artery.
1.Great saphenous vein
2.Internal iliac vein.
Superficial inguinal lymph nodes.
1.Ilio inguinal nerve(L1)
2.Genital branch of the genito femoral nerve(L1)
1.Posterior scrotal nerve,S4
2.Posterior cutaneous nerves of the thigh S3,S4
3.Dartos muscle is supplied by sympathetic nerves.