1. CHAPTER 27 Reproduction and Embryonic Development
Modules 27.2 – 27.3

2. 27.2 Reproductive anatomy of the human female
HUMAN REPRODUCTION
27.2 Reproductive anatomy of the human female
Ovaries
Contain follicles that nurture eggs
Produce sex hormones
Oviducts
Convey eggs to the uterus
Ovaries
Oviduct
Corpus luteum
Follicles
Uterus
Wall of uterus
Endometrium (lining of uterus)
Cervix (“neck” of uterus)
Vagina
Figure 27.2A

3. Uterus Vagina Development of fertilized egg Opens into the vagina
Receives penis during intercourse
Forms the birth canal
Ovaries
Oviduct
Corpus luteum
Follicles
Uterus
Wall of uterus
Endometrium (lining of uterus)
Cervix (“neck” of uterus)
Vagina
Figure 27.2A

4. Ovulation
An egg cell is released from a follicle at the surface of an ovary
The orange mass below the ejected oocyte is part of the ovary
Egg cell
Figure 27.2B

5. Bladder (excretory system) Rectum (digestive system)
Oviduct
Ovary
Uterus
Bladder (excretory system)
Rectum (digestive system)
Pubic bone
Cervix
Urethra (excretory system)
Shaft
Vagina
Glans
Clitoris
Bartholin’s gland
Prepuce
Labia minora
Labia majora
Vaginal opening
Figure 27.2C

6. 27.3 Reproductive anatomy of the human male
Semen
Sperm, which are expelled through the ducts during ejaculation
Glandular secretions that carry, nourish, and protect the sperm
Testes
Produce sperm
Located outside abdominal cavity within the scrotum

7. Bladder (excretory system)
Seminal vesicle (behind bladder)
Prostate gland
Bulbourethral gland
Urethra
Erectile tissue of penis
Scrotum
Vas deferens
Epididymis
Testis
Glans of penis
Figure 27.3B

8. Bladder (excretory system)
Seminal vesicle
Rectum (digestive system)
Pubic bone
Vas deferens
Erectile tissue of penis
Ejaculatory duct
Prostate gland
Urethra
Vas deferens
Bulbourethral gland
Glans of penis
Epididymis
Testis
Scrotum
Prepuce
Figure 27.3A

9. There are two stages of ejaculation
First stage of ejaculation
Sphincter contracts
Bladder
Urethra region here expands and fills with semen
Contractions of vas deferens
Contractions of seminal vesicle
Contractions of prostate gland
Contractions of epididymis
Sphincter contracts
Figure 27.3C

10. Second stage of ejaculation (expulsion stage)
Sphincter remains contracted
Semen expelled
Contractions of muscles around base of penis
Contractions of epididymis
Sphincter relaxes
Figure 27.3C

11. Androgens stimulate sperm production
They also maintain homeostasis by a negative feedback mechanism that inhibits the secretion of FSH (follicle-stimulating hormone) and LH (luteinizing hormone)

12. Negative feedback Androgen production Testis Sperm production
Stimuli from other areas in the brain
Hypothalamus
Releasing hormone
Anterior pituitary
Negative feedback
FSH LH
Androgen production
Testis
Sperm production
Figure 27.3D