Male Genital System – Anatomy

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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

penis.

THE SCROTUM

The Scrotum is the downward prolongation of the anterior abdominal

wall. It lodges the following structures

1.Testis

2.Epididymis and

3.Spermatic cord

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

1.Skin

2.Dartos muscle

3.External spermatic fascia

4. Cremasteric muscle and fascia

5. Internal spermatic fascia

6.Tunica vaginalis testis.

SKIN

The skin is thin and transparent and elastic. So it allows distensions.

DARTOS MUSCLE

This is the continuation of the superficial fascia of the anterior

abdominal wall.

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.

BLOOD SUPPLY

Arterial Supply

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.

Venous Drainage

1.Great saphenous vein

2.Internal iliac vein.

Lymphatic Drainage

Superficial inguinal lymph nodes.

NERVE SUPPLY

Anterior1/3

1.Ilio inguinal nerve(L1)

2.Genital branch of the genito femoral nerve(L1)

Posterior 2/3

1.Posterior scrotal nerve,S4

2.Posterior cutaneous nerves of the thigh S3,S4

3.Dartos muscle is supplied by sympathetic nerves.

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