Testis (so far based on Dave's notes only) Flashcards
What covers the oval testis? Where is the epididymis located?
Tunical albuginea. Epididymis located on posterolateral surface.
Describe the origin and location of the Vas
The vas is a direct continuation of the epididymis and lies medial, with anterior and lateral parts lying free in the tunica vaginalis
The testes, …………., and tunical vaginalis lie in the ………. surrounded by layers of the ……….., with right and left separated
- Epididymis
- Scrotum
- Cord
What is the blood supply of the testis and what is its course?
Testicular artery: direct from aorta, gives a branch to the epididymis, then reaches the back of the testis which ????sweep around horizontally with the tunica albuginea
Describe the venous drainage of the testes
Pampiniform plexus acts as a counter-current heat exchange. Combine to one vein which on the left drains to the left renal vein, and direct to IVC on the right.
Describe the parasympathetic supply to the testes
There is no parasympathetic supply to the testes
Describe the nerve supply of the testes
Supplied by sympathetic nerves from T10. ?Course is splanchnic -> coeliac ->testicular artery. Sensory fibres share the return pathway.
Where are lymph capillaries found in the testes?
Between the seminiferous tubules
Where does testicular lymph drain to?
TESTICULAR lymph runs back with the testicular artery to para-aortic nodes.
SCROTAL lymph drains to the inguinal nodes
…….. radiate from the ………………….. testes dividing the tested into about 400 …………., each containing 2-4 ……………. ………. 60cm long.
Septa, mediastinum, lobules, seminiferous tubules
What do seminiferous tubules empty into?
The seminiferous tubules empty into the rete testis
What to the rete testis pass into?
The rete testis pass into the vasa efferentia (15-20)
What do the vasa efferentia pass into?
The vasa efferentia pass into the epididymis
What are the supporting cells and what do they do?
The sustentacular are supporting cells which secrete androgen binding protein to ??sustain an elevated level of testosterone
What are the functional cells and what do they do?
Interstitial cells of Leydig are the functional cells. These secrete testosterone and are scattered throughout.
Where are the testes at the end of the fourth month of development?
The deep inguinal ring
Where are the testes at the seventh month of development?
In the deep inguinal ring, then rapidly progresses into the scrotum
What precedes the testes descent?
The processus vaginalis and the gubernaculum
What gives rise to an indirect hernia?
Failure of obliteration of the whole processes vaginalis
What does partial persistence of the processes vaginalis lead to?
Hydrocele of the cord
The epididymis is a …….. structure, …m long, tightly …., with a large …… and small ……, with a small …….. between it and the testis. The ductus deferens is a direct …………….. and passes up ……….. .
Firm, 7m, coiled, head, tail, sinus
Continuation, medially.
What is the role of the epididymis?
Organ of storage and maturation of spermatazoa
What is the blood supply of the epididymis?
A branch of the testicular artery
How do you recognise the epididymis and ductus deference histologically?
Epididymis - multiple cuts
Ductus deferens - thick wall, narrow lumen, three layers
What is the nerve supply of the epididymis and ductus deferens?
Sympathetic fibres
What does the ductus deferens arise from
The mesonephric duct
