Essentials of Anatomy and Physiology

toneum that covers the ovaries. These ligaments help keep the ovaries in place. Within an ovary are several hundred thousand pri ...

developing follicles begin to deteriorate; these are called atretic folliclesand have no further purpose. Under the influence of ...

(mucosa) is extensively folded and is made of ciliated epithelial tissue. The sweeping action of the cilia also moves the ovum t ...

urethra and anterior to the rectum (see Fig. 20–5). The vaginal opening is usually partially covered by a thin membrane called t ...

MAMMARY GLANDS The mammary glandsare structurally related to the skin but functionally related to the reproductive sys- tem beca ...

LHfrom the anterior pituitary gland, estrogenfrom the ovarian follicle, and progesteronefrom the cor- pus luteum. The fluctuatio ...

469 Progesterone Estrogen FSH LH Endometrial changesduring the menstrual cycle Ovariancycle Hormone levels (relative scale) Func ...

Anterior pituitary Anterior pituitary Ovary (follicle) Placenta during pregnancy Ovary (corpus luteum) Placenta during pregnancy ...

Reproductive Systems—purpose is to pro- duce gametes (egg and sperm), to ensure fertilization, and in women to provide a site fo ...

Uterus (single)—superior to the urinary bladder and between the two ovaries (see Fig. 20–5). Myometrium is the smooth muscle la ...

Compare meiosis with mitosis in terms of number of divisions, number of cells produced, number of chromosomes in each cell, and ...

474 CHAPTER 21 Chapter Outline Human Development Fertilization Implantation Embryo and Embryonic Membranes Placenta and Umbilica ...

Human Development and Genetics 475 New Terminology Alleles (uh-LEELZ) Amnion (AM-nee-on) Amniotic fluid (AM-nee-AH-tik FLOO-id) ...

How often have we heard comments such as “She has her mother’s eyes” or “That nose is just like his father’s”—because people can ...

EMBRYO AND EMBRYONIC MEMBRANES An embryois the developing human individual from the time of implantation until the eighth week o ...

478 BOX21–1 TWINS place, and each inner cell mass may develop into a complete individual. Twins of this type may be called monoz ...

in the procedure called amniocentesis (see Box 21–2: Fetal Diagnosis). The rupture of the amnion (some- times called the “bag of ...

beating, and limb buds are visible. The period of embryonic growth continues until the 8th week. At this time, all of the organ ...

hCG is to stimulate the corpus luteum in the maternal ovary so that it will continue to secrete estrogen and progesterone. The s ...

482 Table 21–2 GROWTH OF THE EMBRYO–FETUS Month of Approximate Overall Gestation (end) Aspects of Development Size in Inches 1 2 ...