human reproduction - part 1
DESCRIPTION
human reproductionTRANSCRIPT
Read in the name of GOD who created you…
WELCOME
HUMAN REPRODUCTIO
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• HUMAN REPRODUCTIVE SYSTEM MALE REPRODUCTIVE SYSTEM FEMALE REPRODUCTIVE SYSTEM
• GAMETOGENESIS SPERMATOGENESIS OOGENESIS
• MENSTRUAL CYCLE (REPRODUCTIVE CYCLE)• FERTILIZATION AND IMPLANTATION• PARTURITION AND LACTATION
• HUMAN REPRODUCTIVE SYSTEM MALE REPRODUCTIVE SYSTEM FEMALE REPRODUCTIVE SYSTEM
• GAMETOGENESIS SPERMATOGENESIS OOGENESIS
• MENSTRUAL CYCLE (REPRODUCTIVE CYCLE)• FERTILIZATION AND IMPLANTATION• PARTURITION AND LACTATION
Topics to be discussed
HUMAN REPRODUCTIVE
SYSTEM
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• Reproduction is the production of young ones by an organism. • Humans are sexually reproducing and viviparous.
MALE REPRODUCTIVE SYSTEM
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Male reproductive system
Male reproductive system
Paired testesPaired testes
Accessory ducts
Accessory ducts
Rete testisRete testis
Vasa efferentiaVasa efferentia
Epididymis Epididymis
Vas deferensVas deferens
Accessory glands
Accessory glands
A prostate glandA prostate gland
Paired seminal vesicles Paired seminal vesicles
Paired Cowper’s glands (bulbo-urethral glands)Paired Cowper’s glands (bulbo-urethral glands)External
genitalia (Penis)External
genitalia (Penis)
Primary sex organs that produce sperms & testosterone.
Testes are formed within the abdomen. Soon after the birth or at the 8th month of pregnancy they descent into the scrotal sac (scrotum) through inguinal canal.
The low temperature (2-2.50 C less than the body temperature) of scrotum helps for proper functioning of testes and for spermatogenesis.
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1. Paired testes
1. Paired testes
• Each testis is oval in shape. • Length 4-5 cm,
width: 2-3 cm.• Each testis has about 250
testicular lobules. • Each lobule contains 1-3
coiled seminiferous tubules.
• Each testis is oval in shape. • Length 4-5 cm,
width: 2-3 cm.• Each testis has about 250
testicular lobules. • Each lobule contains 1-3
coiled seminiferous tubules.
• Seminiferous tubule is lined internally with spermatogenic cells (spermatogonia or male germ cells) & Sertoli cells (supporting cells). • Sertoli cells give shape and
nourishment to developing spermatogenic cells.
• Seminiferous tubule is lined internally with spermatogenic cells (spermatogonia or male germ cells) & Sertoli cells (supporting cells). • Sertoli cells give shape and
nourishment to developing spermatogenic cells.
The regions outside the seminiferous tubules (interstitial spaces) contain
Small blood vessels.Interstitial cells or Leydig cells. They secrete testicular hormones (androgens). Immunologically competent cells
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1. Paired testes
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The urethra receives the ducts of prostate and Cowper’s glands and passes through the penis.
They include ◦ A pair of seminal vesicles◦ A prostate gland ◦ A pair of Cowper’s glands
(bulbo-urethral glands).
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3. Accessory glands
Their collective secretion (seminal plasma) is rich in fructose, Ca and enzymes. It Helps for transporting sperms Supplies nutrients to sperms Provides an alkaline medium
to counteract the acidity of the uterus.
Secretions of Cowper’s glands lubricate the penis.
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4. Penis (external genitalia)
• It is a copulatory organ • It is made up of special
erectile spongy tissues. • Penis erects when the
spongy tissue is filled with blood. It facilitates insemination.
• The cone-shaped tip of the penis is called glans penis which is covered by prepuce (foreskin).
• It is a copulatory organ • It is made up of special
erectile spongy tissues. • Penis erects when the
spongy tissue is filled with blood. It facilitates insemination.
• The cone-shaped tip of the penis is called glans penis which is covered by prepuce (foreskin).
CHECK YOUR GRASP
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Odd man out
A. Prostate B. Epididymis C. Seminal vesicleD. Cowper’s glands
Which is false statement?
A. Testes are the primary sex organ of male.B. Sertoli cells give nourishment to developi
ng sperms.C. Leydig cells produce androgen.D. Rete testis temporarily stores sperms.
Which gland lubricates the penis?
A. Cowper’s glandB. Prostate glandC. Seminal vesicleD. All of the above
The cone shaped tip of the penis is called
SEE PART 2
Prepared byMUHAMMED ALI. K.C
DEPARTMENT OF ZOOLOGYPh: 9544187632
Email: [email protected]
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