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Lecture 14

01:119:116 Lecture Notes - Lecture 14: Fallopian Tube, Reproductive System, OogenesisPremium

6 pages54 viewsSpring 2018

Department
Biological Science
Course Code
01:119:116
Professor
G.Transue
Lecture
14

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I. Female Reproductive System
A. Function
1. Egg Production
2. Receives penis and sperm
3. Nourishes embryo
4. Lactates
B. Anatomy
1. Ovary= gonads---> house oocytes (oo=egg, cytes=cell)
2. Hormones=estradiol and progesterone
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3. Oviducts (fallopian tubes)-where secondary oocyte moved by cilia
In the ovary there are:
Follicles-where egg matures; many follicles
Oocyte=cell that---> meiosis to make egg
Uterus (womb)
Myometrium-smooth muscle---> contractions * actually squeezable *
Endometrium-blood vessels, glands, tissues
Cervix-small opening at bottom of uterus
Vagina= birth canal
Vulva=external genitalia
II. Oogenesis
(quick Meiosis review) 2n cell-->
Meiosis 1--> 2 haploid
Each meiosis II
--> 4 haploid cells
During oogenesis one egg produced others are lost as polar bodies.
A. Prior to Puberty
In the embryonic ovary
Primordial germ cells (2n)
Divide and differentiate--->
Form oogonium (2n)
(within oogonium):
Primary Oocytes (2n) begin meiosis arrests (stops) at prophase 1
WAIT FOR PUBERTY
At Birth~1-2 million
Primary Oocytes
By sexual maturity only ~200,000 remain
Each Primary oocyte is housed within a follicle
(Remember many follicles are in each ovary)
Primary oocyte is waiting inside the follicle
Follicle cells: protective barrier
Zona Pellucida: between primary oocyte and follicle cells; glycoproteins
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