3 Flashcards
(25 cards)
What is gametogenesis?
Formation of gametes
Gametes develop in the gonads (sex cells)
What is spermatogenesis?
Formation of sperm
Occurs in males
What is oogenesis?
Formation of ova
Occurs in females
What begins spermatogenesis?
Puberty
Where are spermatozoa formed?
In the wall of seminiferous tubules of the testes
What cells provide support and nutrition to germ cells during spermatogenesis?
Sertoli (sustentacular) cells
What hormone regulates Sertoli cells?
Luteinising hormone (LH)
What do Leydig cells stimulate the production of?
Testosterone
List the stages in spermatogenesis.
- Primary spermatocyte
- Secondary spermatocytes
- Spermatids
- Spermatozoa
What is spermiogenesis?
Transformation of a circular spermatid to a spermatozoon
What are the phases of spermiogenesis?
- Golgi phase
- Cap phase
- Acrosomal phase
- Maturation phase
Describe a spermatozoon.
An actively motile, free swimming cell consisting of a head, neck, and tail (flagellum)
What does the head of a spermatozoon consist of?
Nucleus covered by acrosomal cap
What segments does the tail of a spermatozoon have?
- Middle piece
- Principal piece
- End piece
Where does oogenesis occur?
In the ovaries and in the oviducts
When does oogenesis start?
Before birth
What are oogonia?
Cells present in the cortex of the ovary that do not multiply after birth
What happens to the cytoplasm during meiosis in oogenesis?
It is not equally divided
What is a polar body?
Nonfunctional product of meiotic divisions in oogenesis
Define gamete.
Egg or sperm
What is the zygote?
Fertilized egg
What is the follicle?
Where eggs mature in the ovary
What is ovulation?
Release of egg from follicle
What is the main difference in cytoplasmic division during oogenesis compared to spermatogenesis?
One cell survives while the other becomes a polar body
