Male Repro Flashcards
Male repro is adapted to …
- produce spermatozoa which fertile the ova
- produce fluid which aids the survival of sperm and transports them into genital tract
- secreted hormones that bring about development of male secondary sexual characteristics and behavioural patterns
Parts of male tract
Testis Epididymis Ductus deferents Urthera Penis Prostate gland Bulbo-Urethral gland (cat only )
Where do testes lie
Outside body cavity but are retained by scrotum
Connected to urthera via deferent duct and lie in pelvic cavity
What does urthera do
Runs in the penis and shared with urinary system
Male gonad
Testies
Function if testis
- produce sperm to fertilise the ova from the female animal
- secrete hormones which cause the development of the male secondary sexual characteristics and male behavioural patterns
- produced fluid to aid survival and help transport them into femalegential tract
What is the scrotum
Pouch of skin that lies outside the body and is internally divided into 2 sacs by a central septum l each sac contains a tests
Describe the position of the cat scrotum
Lies ventral to the anus and close to inschial arch
Dartos muscle
A layer of smooth muscle inside the wall of the scrotum which when contracted pulls the scrotal skin and with the testes closer to the body
Why does the dartos muscle contract
To pull testes closer to the body to keep warm in cold weather or relax as in warm weather to cool to ensure efficient spermatogenesis/ sperm production
Tunica albuginea
White fibrous tissue capsule covering externally each testies
Semi fibrous tubules
Numerous coiled blind ending tubules internally in the testes
Spermatogonia
After many divisions these are responsible for the producing immature sperm or spermtids
Sertoli cells
These secrete nutrients to prolong the survival of the sperm as they travel along the seminiferous tubules.
Hormone secreted by spermatogonia and Sertoli cells
Oestrogen
Where are cells of the leydig or interstitual cells
Lying between the seminiferous tubules
The leydig cells
Controlled by luternising hormones (LH) secreted by the anterior pituary gland at the base of brain,
- secrete the hormone testosterone
What does testosterone cause
- development and maintenance of male genital tract and accessory gland
- devlopement of the secondary sexual characteristics such as muscle development, dis ration of hair size, colour of plumage in birds,
- male behaviour ( sexual behaviour, territoriality and aggression
WHat does testerone regulate
Regulate its own production via a feedback mechanism on the hypothalamus and pituitary gland
Epididymis
The coiled seminiferous tubules make up most of the testicular tissue and the tubules join to form a network of straighter tubules known as rete testes and unite to form epididymis .
Epididymis is a long coiled tube lying along the dorsal after border if the testis p.
Vaginal process or tunica vaginalies
An outpouch or Evagination of the peritoneum that wraps the testis to form the double layer of connective tissue
The tunica vaginalis wraps around the spermatic cord which contains the
Spermatic artery
Spermatic vein
Spermatic nerve
Ductus deferens
Cremaster muscle
Lies within the connective muscle of the spermatic cord
When this contracts pulls testis closer to body
Gubernaculum
Band of tissue that attaches at one end of the tail of testis and the epididymis and the other end of the scrotal sac.
- pulls testis caudaulky trough abdomen into scrotum
