1.9 Intro to Embryology Flashcards Preview

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Flashcards in 1.9 Intro to Embryology Deck (13):
1

A specialized extracellular matrix surrounding the oocyte; transparent zone

Zona Pellucida

2

Supplies vital protein to cells, appears at ovulation, and disappears after fertilization

Corona Radiata

3

Is the period of conditioning of the female reproductive tract; lasts 7 hours; removal of glycoprotein coat and seminal plasma protein from the plasma membrane of spermatozoa

Capacitation

4

Occurs after binding of the spermatozoa to the zona pellucida; induced by zona proteins and culminates in the release of enzymes needed to penetrate the zona pellucida

Acrosome reaction

5

Phases of acrosome reactions and key activities

Phase 1: penetration of corona radiata; other sperms aid the fertilizing sperm in penetrating
Phase 2: Penetration of Zona Pellucida; Binding and acrosome reaction, release of acrosomial enzyme; sperm penetrates
Phase 3: Fusion of oocyte and sperm cell membranes; completion of oocyte's meiosis II

6

Acrosomial enzyme which allows sperm to penetrate zona

Acrosin

7

Enzymes released which prompt the zona reaction which prevents polyspermy

Lysosomal enzymes

8

16-cell stage at day 3

Morula

9

Part of morula which gives rise to embryoblast

Inner cell mass

10

Part of morula which gives rise to trophoblast which becomes the placenta

Outer cell mass

11

Summary of events in week 1 (including hours/days)

OvulationFertilization (12-24 hours after)
Cleavage and Morulation (30 hours
)Blastocyst formation (4 days)
Implantation (6 days)

12

Two differentiated layer of embryoblast

Hypoblast (small cuboidal)
Epiblast (high columnar)

13

Location of amniotic cavity

Epiblast