1.9 Intro to Embryology Flashcards

1
Q

A specialized extracellular matrix surrounding the oocyte; transparent zone

A

Zona Pellucida

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2
Q

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

A

Corona Radiata

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3
Q

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

A

Capacitation

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4
Q

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

A

Acrosome reaction

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5
Q

Phases of acrosome reactions and key activities

A

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

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6
Q

Acrosomial enzyme which allows sperm to penetrate zona

A

Acrosin

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7
Q

Enzymes released which prompt the zona reaction which prevents polyspermy

A

Lysosomal enzymes

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8
Q

16-cell stage at day 3

A

Morula

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9
Q

Part of morula which gives rise to embryoblast

A

Inner cell mass

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10
Q

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

A

Outer cell mass

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11
Q

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

A
Ovulation
Fertilization (12-24 hours after)
Cleavage and Morulation (30 hours)
Blastocyst formation (4 days)
Implantation (6 days)
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12
Q

Two differentiated layer of embryoblast

A

Hypoblast (small cuboidal)

Epiblast (high columnar)

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13
Q

Location of amniotic cavity

A

Epiblast

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