PowerPoint ® Lecture Slides prepared by Leslie Hendon, University of Alabama, Birmingham HUMAN ANATOMY fifth edition MARIEB | MALLATT | WILHELM 24 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings The Reproductive System PART 4

Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings The External Genitalia and Female Perineum Figure 24.20a

Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings Deep Structures of the External Genitalia and Female Perineum Figure 24.20b

Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings The Mammary Glands  Breasts – modified sweat glands  Glandular structure – undeveloped in non-pregnant women  Milk production – starts at or after childbirth

Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings The Mammary Glands Figure 24.21a, b

Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings Pregnancy  Events leading to fertilization  Sperm binds to the zona pellucida  Undergoes the acrosomal reaction  Release of enzymes to form a slit in the zona pellucida  Fusion of oocyte and sperm plasma membranes  Cortical reaction  Enzymes prevent any other sperm from binding to the egg  Fertilization – chromosomes of male and female gametes join

Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings Events Leading to Fertilization Figure 24.22