Friday, March 20, 2015

Scrotal and testicular anatomy

Posted by Pulasthi Senaratna

Scrotal and testicular anatomy

A 23 year old man undergoes an orchidectomy. The right testicular vein is ligated; into which structure does it drain?

  

A.

Right renal vein

 

 

B.

Inferior vena cava

  

C.

Common iliac vein

  

D.

Internal iliac vein

  

E.

External iliac vein

 

The testicular venous drainage begins in the septa and these veins together with those of the tunica vasculosa converge on the posterior border of the testis as the pampiniform plexus. The pampiniform plexus drains to the testicular vein. The left testicular vein drains into the left renal vein. The right testicular vein drains into the inferior vena cava.

 

Scrotal and testicular anatomy

Spermatic cord


Formed by the vas deferens and is covered by the following structures:

Layer

Origin

Internal spermatic fascia

Transversalis fascia

Cremasteric fascia

From the fascial coverings of internal oblique

External spermatic fascia

External oblique aponeurosis

Contents of the cord

Vas deferens

Transmits sperm and accessory gland secretions

Testicular artery

Branch of abdominal aorta supplies testis and epididymis

Artery of vas deferens

Arises from inferior vesical artery

Cremasteric artery

Arises from inferior epigastic artery

Pampiniform plexus

Venous plexus, drains into right or left testicular vein

Sympathetic nerve fibres

Lie on arteries, the parasympathetic fibres lie on the vas

Genital branch of the genitofemoral nerve

Supplies cremaster

Lymphatic vessels

Drain to lumbar and para-aortic nodes

Scrotum

  • Composed of skin and closely attached dartos fascia.
  • Arterial supply from the anterior and posterior scrotal arteries
  • Lymphatic drainage to the inguinal lymph nodes
  • Parietal layer of the tunica vaginalis is the innermost layer

Testes

  • The testes are surrounded by the tunica vaginalis (closed peritoneal sac). The parietal layer of the tunica vaginalis adjacent to the internal spermatic fascia.
  • The testicular arteries arise from the aorta immediately inferiorly to the renal arteries.
  • The pampiniform plexus drains into the testicular veins, the left drains into the left renal vein and the right into the inferior vena cava.
  • Lymphatic drainage is to the para-aortic nodes.