Flashcards in Chapter 2 gametogenesis Deck (59)
primitive sex cords
supporting cells plus the germ cells
areas where the gonads are going to form
What are the supporting cells of the female ?
what are the supporting cells of the male?
In male gametogenesis, primordial germ cells lay dormant until when ?
What hormone and cells places an important role in male gametogenesis
LH and leydig cells
When does spermatogenesis stop ?
when the person dies
What hormone do the leydig cells secrete?
what starts the process of spermatogensis?
secretion of testosterone by the leydig cells
conversion of spermatids into mature sperm
What four steps occur in spermiogenesis?
lose the cytoplasm, condense nucleus, neck+ tail added and acrosome added
maturation of the sperm occurs where ?
vagina of the female
at week 12 what major step happens in female gametogenesis
population of oogonia after their first meiotic prophase become dormant until puberty!
capsule and the follicle
What do the follicular cells secrete that prevent further progression of the cell cycle in female gametogenesis ?
OMI-oocyte aturation inhibitor helps arrest the process and puts the break in meiosis
What are the two stages of the ovarian cycle ?
follicular stage and the luteal phase
in 5-12 primordial follicles what happenes as a result of FSH and LH ?
the follicular cells begen to thicken to cuboidla cells and it becomes a primary follicle
a glycoprotein coat sereted by the follicular cells and the oocyte together
the structure that is formed that has an antrum (take up of fluid and space) when the main follicle continues to develop
what hormone secretes HcG
what hormone does the corpus luteum secrete
progesterone until the placenta takes over
occur during organogenesis in the embryonic period and result in abnormal structure
result from external influence that causes alterations of completely formed structures
abnormal form resulting from mechanical forces (club foot is an example)
abnormal organization of cells into tissue (sacrococcgela teratome)
what percentage of congenital abnormalities is caused by genetic factors ?
absence of an organ
cells to form an organ never formed
anamalies occuring together without determiend cause