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THIRD EDITION
HUMAN PHYSIOLOGY
AN INTEGRATED APPROACH
Dee Unglaub Silverthorn, Ph.D.
Chapter 26, part A
Reproduction and Development
PowerPoint® Lecture Slide Presentation by
Dr. Howard D. Booth, Professor of Biology, Eastern Michigan University
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
About this Chapter
• How male and female reproductive systems
differentiate
• The reproductive organs and how they work
• How gametes are produced and fertilized
• Pregnancy, stages of development, birth &
lactation
• Reproductive and developmental maturation and
aging
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Sex Determination: Overview
• Dimorphism:
• Males  sperm
• Females  eggs
• Chromosomes
• Autosomes
• Sex Chromosomes
• X - chromosome
• Y - chromosome
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 26-1: Human chromosomes
Sex Determination: Overview
Figure 26-2: Inheritance of X and Y chromosomes
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Sexual Differentiation:
Internal Embryonic Development
• Bipotential tissues: genes & hormones direct
differentiation
• Gonad  testis or ovary
• Wolffian duct  Vas deferens, Mullerian duct 
oviduct
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Sexual Differentiation:
Internal Embryonic Development
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 26-3a: Sexual development in the human embryo
Sexual Differentiation: External Genitalia
• Bipotential tissues: genital tubercle, urethral
folds, urethral groove and labioscrotal swellings
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Sexual Differentiation: External Genitalia
Figure 26-3b: Sexual development in the human embryo
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Pathway for Sexual Development:
Review for Genes to Organs
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 26-4: Role of the SRY gene in male development
Overview of Gametogenesis:
Producing Eggs or Sperm
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 26-5: Gametogenesis
Regulation of Reproduction: General Pathways
• Hypothalamus: pulse generator
• Gonadotropin releasing H
• (GnRH)
• Anterior Pituitary
• Lutenizing H (LH)
• Follicle stimulating H (FSH)
• Ovary: progesterone
• Estrogen, inhibin
• Testis: testosterone
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Regulation of Reproduction: General Pathways
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 26-7: General pattern of hormonal control of reproduction
Male Reproductive Anatomy and Physiology
• Testis
• Epididymis
• Vas deferens
• Seminal vesicle
• Prostate
• Bulbourethral
• Ejaculatory duct
• Urethra
• Penis
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Male Reproductive Anatomy and Physiology
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 26-9a: ANATOMY SUMMARY: Male Reproduction