Flashcards in Chapter 2 gametogenesis Deck (59)
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1
primitive sex cords
supporting cells plus the germ cells
2
genital ridges
areas where the gonads are going to form
3
What are the supporting cells of the female ?
follicular cells
4
what are the supporting cells of the male?
sertoli cells
5
In male gametogenesis, primordial germ cells lay dormant until when ?
puberty
6
What hormone and cells places an important role in male gametogenesis
LH and leydig cells
7
When does spermatogenesis stop ?
when the person dies
8
What hormone do the leydig cells secrete?
testosterone
9
what starts the process of spermatogensis?
secretion of testosterone by the leydig cells
10
spermiogenesis
conversion of spermatids into mature sperm
11
What four steps occur in spermiogenesis?
lose the cytoplasm, condense nucleus, neck+ tail added and acrosome added
12
maturation of the sperm occurs where ?
vagina of the female
13
at week 12 what major step happens in female gametogenesis
population of oogonia after their first meiotic prophase become dormant until puberty!
14
ovarian follicle
capsule and the follicle
15
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
16
What are the two stages of the ovarian cycle ?
follicular stage and the luteal phase
17
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
18
zona pellucida
a glycoprotein coat sereted by the follicular cells and the oocyte together
19
graafian follicle
the structure that is formed that has an antrum (take up of fluid and space) when the main follicle continues to develop
20
what hormone secretes HcG
SYNCYTIOTROPHOBLAST
21
what hormone does the corpus luteum secrete
progesterone until the placenta takes over
22
malformations
occur during organogenesis in the embryonic period and result in abnormal structure
23
disruptions
result from external influence that causes alterations of completely formed structures
24
deformations
abnormal form resulting from mechanical forces (club foot is an example)
25
dysplasia
abnormal organization of cells into tissue (sacrococcgela teratome)
26
what percentage of congenital abnormalities is caused by genetic factors ?
28%
27
agenesis
absence of an organ
28
aplasia
cells to form an organ never formed
29
association
anamalies occuring together without determiend cause
30
