Sexual Reproduction in
Humans
Chapter –I
Reproduction Systems
- Ashish Sharma
1
Human sexual reproduction
involves
•
•
•
•
•
•
Human male reproductive system
Human female reproductive system
Spermatogenesis
Oogenesis
Fertilization
Embryonic development
2
Human
Reproductive
system
1.Gonads
2.repd. Ducts
3.Accessory strucs.
Secondary
reproductive
organs
Males-prostate gland,
seminal vesicles
vasa defferentia,
penis
Females-fallopian
tubes,uterus,vagina,
mammary glands
Sec. sexual
characters
Males-muscular built
,moustache,hairy
coarse skin etc.
Females-less
muscular,
high pitch,
lower BMR 3
Human reproductive system
• Reproductive organs
• Reproductive ducts
• Accessory structures
• Sec. reproductive organs
• Sec. sexual characters
4
Male Reproductive System
•
•
•
•
•
•
•
•
Scrotum
Testes
Epididymes&vasa eff.
Vasa defferentia
Ejaculatory ducts
Urethra
Penis
Accessory sex glands
5
SCROTUM
TESTES
Dark pigmented
pouch
3 Coverings
Internally
Divided into2 sacs
Testicular lobules
Temp 2 deg. less
Seminiferous tubules
6
7
TESTES
Coverings
Tunica Vaginalis
T. Albuginea
T.Vasculosa
Testicular Lobules
(200-300)
Seminiferous Tubules
2-3 in each lobule
Lined by germinal epith.
8
Testes
Rete testes
Network of
seminiferous tubules
Vasa differentia
2 tubules
arising from
Cauda epididymes
Epididymes
Stores sperms and
secrete nourishment
9
Other parts of male reproductive
system
• Ejaculatory ducts
• Urethera
• penis
• 2 tubes, arising from
seminal vesicles ,
carry sperms &
secretions
• 20 cm long, carries
urine and sperms
• Copulatory
organ,conducts urine
and sperms
10
Accessory
sex glands
Seminal
vesicles-2
Secrete fructose &
prostaglandins
Prostate
Gland
Secretes fluid
containing citric acid
,some lipids
, few enzymes &
bicarbonate ions
Cowper’s
Glands
Mucus
11
Human Female Reproductive
System
•
•
•
•
•
•
Ovaries
Fallopian tubes
Uterus
Vagina
External genitalia
Mammary glands
12
Parts of Female Reproductive System
Ovaries
Shows
developing
follicles & corpus
luteum & corpus
albicans
Attached to uterus
by ovarian ligament
Outer cortex
Covered by
Germinal epith.
stroma
Inner medulla
Gametes production
Functions
Hormone production
13
Fallopian ducts
F
A
L
L
O
P
I
A
N
T
U
B
E
S
Uterine part
Within uterine wall
Isthmus
Lateral to uterine wall
PARTS
Ampulla
Infundibullum
Site of fertilization
Funnel like, has finger
like projectionsfimbrie
14
15
U
T
E
R
U
S
Hollow muscular , pear shaped
Between urinary bladder & rectum
Fundus
Parts
Body
Cervix
V
A
G
I
N
A
Communicates with fallopian tubes
Harbours embryo
Communicates below with vagina
10 cm long
Provides passage for menstrual flow
Serves as receptacle for sperms
Outer opening – vaginal orifice
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V
U
L
V
A
Mons pubis
Clitoris
Anterior most portion
Erectile tissue , homologus to penis
Outer thick skin folds
Labia Majora
Labia Minora
Bartholin’s Glands
Inner smaller skin folds
Help in lobrication, on either side of
vaginal opening
Perineum
Modified sweat glands
Female hormones develop them
MAMMARY
GLANDS
Parts
Nipple, areola, areolar glands(sebaceous glands)
lactiferous sinuses(reservoir of milk),fatty tissue
Prolactin produces milk
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Oxytocin releases milk
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