Male reproductive anatomy AHS1 Flashcards
What is the difference between an open and closed castration?
The vaginal tunic remains intact in a closed castration
What are the 3 main things the male repro tract produces?
Spermatozoa
Seminal fluid
Testosterone
What is the testes heat exchange system called?`
Pampiniform plexus
What makes up the pampiniform plexus?
The highly coiled testicular vein
What is the muscle that retracts the testes? What is it part of?
The cremaster muscle
Part of the internal abdominal oblique
What is the peritoneum that wraps around the testes called?
The vaginal tunic
What are the two layers of the vaginal tunic called?
Parietal and visceral vaginal tunic
What is the visceral vaginal tunic closely associated with?
The surface of the testes
What is the parietal vaginal tunic closely associated with?
The internal spermatic fascia
What is the internal (deep) spermatic fascia like?
Very tough - must cut
Cant separate it from the parietal vaginal tunic
What is the external (superficial) spermatic fascia like?
Weak so can easily be blunt dissected
What is the muscle that is closely associated with the skin surrounding the testes?
The dartos muscle
What are the layers of the tissue surrounding the testes from out to in?
Skin Dartos muscle External spermatic fascia Internal spermatic fascia Parietal vaginal tunic Visceral vaginal tunic Testes
What happens to the cranial gonadal ligament during development?
It degenerates to allow the testes to be pulled caudally
What happens to the caudal gonadal ligament?
It becomes the 3 main ligaments of the testes
What are the 3 main ligaments of the testes?
Proper ligament of the testis
Ligament of the tail of the epididymis
Scrotal ligament
What does the proper ligament of the testes attach between?
Between the testis and the ductus deferens
What does the ligament of the tail of the epididymis attach between?
The ductus deferens/testis and the internal spermatic fascia
What does the scrotal ligament attach between?
The internal and external spermatic fascia - easy to break down
What is the glans part of the canine divided into?
The pars longa glandis and the bulbus glandis
What is the pars longa glandis?
The long part of the glans - doesn’t expand as much as the bulbus glandis
What is the bulbus glandis?
The bulb of the penis which expands when erect for copulatory lock
Where is the corpus spongiosum found?
Surrounding the urethra
What is the glans of the canine penis?
Distal expansion of the corpus spongiosum
What is the os penis formed from?
The corpus cavernosa
What muscles are contracted in the flaccid penis?
Retractor penis muscle and smooth muscle in walls of cavernous spaces
What response of the nervous system causes as erection?
Inhibition of the sympathetic tone
What compresses venous return?
The urogenital diaphragm - ischiocavernosus, ishiourethralis and bulbospongiosus
What key blood vessel is compressed by what muscle of the urogenital diaphragm?
The dorsal vein of the penis is compressed by the ischiourethralis muscle
In copulatory lock what muscle from the female constricts which blood vessel of the male?
The constrictor vestibuli/vestibularis muscle of the female constricts the superficial vein of the glans
