Fertilization and Early Development Flashcards Preview

Embryology > Fertilization and Early Development > Flashcards

Flashcards in Fertilization and Early Development Deck (17):
1

LH

Lutenizing Hormone
Increase in LH triggers ovulation

2

FSH

Follicle stimulating hormone
Increase in FSH promotes formation/maturation of the ovum

3

Zona pellucida

Glycoprotein layer surrounding ovum/ zygote
Prevents polyspermy

4

Spermatogenesis

Formation of sperm

5

Spermiogenesis

Maturation of sperm

6

Capacitation

Reaction that is triggered/occurs in female genital tract
Required for fertilization

7

Zona reaction

Upon binding of sperm to ZP, the ZP undergoes a reaction that changes the characteristics of the ZP to prevent any more sperm from entering

8

Morula

16 cell stage
Surrounded by ZP

9

Compaction

Cells in the morula flatten to maximize contact between them
Accomplished by: cell adhesion molecules, gap junctions, tight junctions

10

Syncytiotrophoblast

Invasive part of the trophoblast

11

Ectopic pregnancy

Fetus develops outside of the uterus (blastocyst implants in inappropriate location)

12

3 types of ectopic pregnancy

1. Uterine tube
2. On ovary
3. Near cervix

13

Placenta privia

Blastocyst implants near the cervix; placenta covers the cervix
Must deliver baby before going into labor by C-section

14

3 layers of inner cell mass

1. Endoderm
2. Mesoderm
3. Ectoderm

15

2 types of folding in trilaminar embryo

1. Longitudinal
2. Transverse

16

2 functions of estrogen

1. Stimulates thickening of the endometrium of the uterus
2. Signals to the pituitary to start secreting FSH and LH

17

2 layers of inner cell mass

1. Epiblast
2. Hypoblast