This document describes the development and location of male and female germ cells in the testes and ovaries. It notes that spermatogonia are located at the base of Sertoli cells in the testes in a scattered formation, while oogonia are located in groups surrounded by follicular cells in the ovaries. It also outlines the stages and locations of meiosis for both male and female germ cells.

1. • Spermatogonia are at base of Sertoli cells.
They are single and scattered.
• Oogonia are in groups, surrounded by flat
follicular cells.

2. • Primary spermatocytes are in the lateral walls
of Sertoli cells.
• Primary oocytes are present in primordial,
primary, secondary and tertiary follicles.

3. • Secondary spermatocytes are present in the
lateral wall of Sertoli cells.
• Secondary oocytes are present in the
preovulatory follicle and in the ovulatory mass

4. • Secondary spermatocytes give rise to
spermatids. Spermatids migrate to the apical
ends of Sertoli cells, transform into
spermatozoa. Fully mature spermatozoa swim
free in the lumen of seminiferous tubules and
now called sperms.
• Secondary oocytes forms ootid or ovum only
after fertilization.

5. • Mitosis in spermatogonia occurs outside
blood testis barrier.
• Mitosis in oogonia occurs in cortex of ovary
surrounded by follicular cells.
• Mitosis in spermatogonia occurs after puberty.
• Mitosis in oogonia occurs in intrauterine life.

6. • First meiotic division occurs in the lateral walls
of Sertoli cells.
• First meiotic division starts in intrauterine life
and continues in reproductive life. It is
completed at the time of ovulation in
Gra’afian follicles.

7. • Second meiotic division occurs in the lateral
wall of Sertoli cells.
• Second meiotic division occurs after
penetration of sperm into the secondary
oocyte. It occurs in the ampullary part of
uterine tube.

8. • Primary spermatocytes, secondary
spermatocytes, spermatids, spermatozoa and
sperms are microscopic structures.
• Primary oocytes and secondary oocytes are
massive cells.

9. • Mature male germ cells are highly motile.
• Mature female germ cells are immobile.

10. • There are two kinds of normal sperms with
respect to sex chromosomes. Discharged by
father in the genital tract of mother.
• There is only one kind of ova present in the
fallopian tubes of mother.