Chapter 60 - Testis part I Flashcards
What does the scrotum of a horse contain?
The testes, associated ducts, and distal spermatic cords.
What is the function of the tunica dartos?
It regulates testicular temperature by relaxing with heat and contracting with cold.
Which vessel provides vascular supply to the scrotum?
The external pudendal vessels.
What type of muscle is the tunica dartos?
Involuntary muscle. This muscle
relaxes with heat and contracts with cold to regulate testicular temperature, thus varying the size of the scrotum
Where is the epididymis located on the testis?
On the dorsolateral border of the testis.
Name the three parts of the epididymis.
Head (caput), body (corpus), and tail (cauda).
How does sperm travel during ejaculation?
Through peristaltic contractions of the epididymis into the ductus deferens.
What covers the testis externally?
The tunica albuginea.
What is the role of the Sertoli cells in the testis?
They provide mechanical and nutritive support for developing spermatozoa.
What hormone stimulates spermatogenesis?
Follicle-stimulating hormone (FSH).
What do Leydig cells produce?
Androgens and estrogen.
What structure do the seminiferous tubules form when they converge?
The rete testis.
Where do the efferent ductules unite to form a single coiled tube?
In the head of the epididymis.
What is the inguinal canal?
An oblique passage in the abdominal wall through which the spermatic cord and other structures pass.
What forms the internal opening of the inguinal canal?
The deep inguinal ring.
What structure lines the wall of the inguinal canal?
The peritoneum, forming the tunica vaginalis.
What two layers make up the tunica vaginalis?
The visceral tunic and the parietal tunic.
What is the purpose of serous fluid in the vaginal cavity?
It lubricates to facilitate movement of the testis.
What is the gubernaculum testis?
A fetal mesenchymal cord that guides testis descent.
What does the cranial part of the gubernaculum testis become?
The proper ligament of the testis.
Where is the vaginal ring located?
About 10-12 cm abaxial to the linea alba and 6-8 cm cranial to the iliopectineal eminence.
What ligament connects the tail of the epididymis to the parietal tunic?
The ligament of the tail of the epididymis.
What could result from abnormal gubernaculum function?
Abdominal or inguinal retention of a testis.
What separates the right and left pouches of the scrotum?
A sagittal septum formed by the tunica dartos.