v
Il Il II II MY I
"I 11) LII
GAMETOGENISIS
-
The formation of gametes (sperm and eggs) in the sexorgans ,
these gametes are haploid (n)
-
There are 2 types of gametogenis :
> Spermatogenists
-
oogenists
NB . in males this starts at puberty and continues until death , and in females this starts at puberty and ends at Menopause
Spermatogenisis :
> formation of sperm from germinal epithelium cells that line seminiferous tubules
<
germinal epithelium divides by mitosis to form more germinal epithe/lum and some cells undergo melosis to form spermatozoa
SEMINIFEROUS
·
germinal epithelium (2n) O O
-
O
O
TUBULE
O y y
y
Meitosis y
O
y
y O
O
O
Spermatogonium (2n)
·
germinal
O
O
epithelium (2n) O
G
G
G O
O G G
growth O y
G O
Y G
S G
O
& O
y
spermatocyte (2n) G
primary
I
G
O O
S O O
y
G
G
O
-
↓
melosis I G O
O O
G
y
y O
O G O
G
O
J O
G y
y
O
O
secondary spermatocytes (n) O
O
O ·
O
y
· O
↓ Y
y O
y
meiosis i
O
y O
y J
O
spermatids (n)
z J ·
O
O
J
J
J J
sperm (n)
& 1 & y
sertoli cell :
support and give nutrition to the spermatids
While they differentiate into sperm cells
< After sperm is formed
,
It is not yet matures ready to fertilize an
ovum . The sperm matures in the epididymis where it is stored until it is
released or reabsorbed .
Structure of sperm
tall
d
head
I
[
>
contractive fibres
acrossme
W
whip-like motion for
digestive enzymes that
Contains s centriole mobility
digest outer layer of ovum for nucleus (n) makes the contractile Mitochondria
penetration fibres provide energy for
mobility
, sperm :
< 0 . 05 mm long
gets its nutrition from the secretions of the prostate gland and seminal vesicles
-
can last up to 48h in the female reproductive system
oogenisis :
- the formation of ove from the germinal epithelial cells
> the first stages of development occur before birth in the varies of the foetus
The primary jocytes are surrounded by follicle cells :
· germinal epithelium (2n)
The follide cells
MILOSIS
ore-birth
L
J
Secrete sestrogen (primary follicle)
jogonium (2n)
J ·
growth
birth ------
-------
Only one primary oocyte divides by melosis to form the
secondary oocyte. This primary follicle grows
·
primary socyte (2n) into the Graafian
follicle FHS IS
Melosis I
↓
L > follicle cells
&
secondary oocyte
·
J
Polar body
pubert L J J
Melosis I >
Cavity filled With fivid
L
J
J J
secondary oocyte
J L
ovum/egg
3 x polar bodies (n)
Call of this in Melosis I]
primary oocyte in
↑
OVARIAN CYCLE *
the primary follicle
②
↑ SH follicle stimulating hormone
3
:
LH :
luteinizing hormone follicle growing
D FSH stimulates
of
pri
orgonia
follice m ary
growth
&
-Gratian ③
secondary oocyte
follicle conan a
!
- ① LH
- triggers ovulation
⑧
S 8
degenerating -.
!
corpus luteum
⑤
↓ >
-
ovulation :
secondary oocyte
released from Graafian follicle
Corpus luteum secretes
and oestrogen
progesterone
I FSH is secreted from the pituitary gland . The FSH stimulates the sogonia to develop into primary follicles
containing primary oocyte
*
② one primary folide becomes dominant. The follicle cells secrete Destrogen
Il Il II II MY I
"I 11) LII
GAMETOGENISIS
-
The formation of gametes (sperm and eggs) in the sexorgans ,
these gametes are haploid (n)
-
There are 2 types of gametogenis :
> Spermatogenists
-
oogenists
NB . in males this starts at puberty and continues until death , and in females this starts at puberty and ends at Menopause
Spermatogenisis :
> formation of sperm from germinal epithelium cells that line seminiferous tubules
<
germinal epithelium divides by mitosis to form more germinal epithe/lum and some cells undergo melosis to form spermatozoa
SEMINIFEROUS
·
germinal epithelium (2n) O O
-
O
O
TUBULE
O y y
y
Meitosis y
O
y
y O
O
O
Spermatogonium (2n)
·
germinal
O
O
epithelium (2n) O
G
G
G O
O G G
growth O y
G O
Y G
S G
O
& O
y
spermatocyte (2n) G
primary
I
G
O O
S O O
y
G
G
O
-
↓
melosis I G O
O O
G
y
y O
O G O
G
O
J O
G y
y
O
O
secondary spermatocytes (n) O
O
O ·
O
y
· O
↓ Y
y O
y
meiosis i
O
y O
y J
O
spermatids (n)
z J ·
O
O
J
J
J J
sperm (n)
& 1 & y
sertoli cell :
support and give nutrition to the spermatids
While they differentiate into sperm cells
< After sperm is formed
,
It is not yet matures ready to fertilize an
ovum . The sperm matures in the epididymis where it is stored until it is
released or reabsorbed .
Structure of sperm
tall
d
head
I
[
>
contractive fibres
acrossme
W
whip-like motion for
digestive enzymes that
Contains s centriole mobility
digest outer layer of ovum for nucleus (n) makes the contractile Mitochondria
penetration fibres provide energy for
mobility
, sperm :
< 0 . 05 mm long
gets its nutrition from the secretions of the prostate gland and seminal vesicles
-
can last up to 48h in the female reproductive system
oogenisis :
- the formation of ove from the germinal epithelial cells
> the first stages of development occur before birth in the varies of the foetus
The primary jocytes are surrounded by follicle cells :
· germinal epithelium (2n)
The follide cells
MILOSIS
ore-birth
L
J
Secrete sestrogen (primary follicle)
jogonium (2n)
J ·
growth
birth ------
-------
Only one primary oocyte divides by melosis to form the
secondary oocyte. This primary follicle grows
·
primary socyte (2n) into the Graafian
follicle FHS IS
Melosis I
↓
L > follicle cells
&
secondary oocyte
·
J
Polar body
pubert L J J
Melosis I >
Cavity filled With fivid
L
J
J J
secondary oocyte
J L
ovum/egg
3 x polar bodies (n)
Call of this in Melosis I]
primary oocyte in
↑
OVARIAN CYCLE *
the primary follicle
②
↑ SH follicle stimulating hormone
3
:
LH :
luteinizing hormone follicle growing
D FSH stimulates
of
pri
orgonia
follice m ary
growth
&
-Gratian ③
secondary oocyte
follicle conan a
!
- ① LH
- triggers ovulation
⑧
S 8
degenerating -.
!
corpus luteum
⑤
↓ >
-
ovulation :
secondary oocyte
released from Graafian follicle
Corpus luteum secretes
and oestrogen
progesterone
I FSH is secreted from the pituitary gland . The FSH stimulates the sogonia to develop into primary follicles
containing primary oocyte
*
② one primary folide becomes dominant. The follicle cells secrete Destrogen
