Embryology Section 1 Flashcards Preview

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Flashcards in Embryology Section 1 Deck (20)
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1
Q

Define the Prenatal period

A

The period of gestation that is prior to birth

2
Q

Define the Perinatal period

A

22 Weeks gestation to 28 day after birth

3
Q

Define Postnatal period and the six categories within this

A

Anytime after birth

neonatal, infancy, childhood, puberty, adolescence, and adulthood

4
Q

Define Neonatal

A

up to one month after birth

5
Q

Define Infancy

A

First postnatal year

6
Q

Define childhood

A

12 months - 12/13 years

7
Q

Define adolescence

A

3-4 years post puberty

8
Q

What is the estimated length of a pregnancy

A

281 days +/-13 days, or 40 weeks

9
Q
What happens in each week?
Week 1: 
week 2: 
Week 3:
Weeks 3-8:
Week 9 - term:
A

Week 1: preimplantation stage: zygote, morula, blastocyst
Week 2: Inner Cell mass forms bilaminar embryo
Week 3: Bilaminar embryo becomes trilaminar embryo
Week 3-8 : Embryonic period - organogenesis
Week 9 to term: Fetal period

10
Q

Define gestational age

A

Gestational age is is the age of the conseptus from the presumed first day of the last menstrual period

11
Q

Define Fertilization age

A

the age of the conceptus from the fertilization day

12
Q

How much longer is the GA than the FA?

A

2 weeks longer

13
Q

What is Naegele’s rule?

A

It is a rule to determine the due date. It is calculated: Last menstrual period prior to ovulation - 3 months +1 year + 1 week

14
Q

What percent of women deliver on their due date?

A

5%

15
Q

What percent of women deliver within 13 days from their due date?

A

60-70%

16
Q

Define abortion

A

expulsion from the uterus prior to age of viability which is 22-23 weeks gestation, or

17
Q

Define Miscarriage

A

spontaenous expulsionfrom the uterus before mid pregancy (22 weeks)

18
Q

Define a Premature Birth

A

infants born btw. the stage of viability and 37 weeks

19
Q

What is the all or nothing period

A

this is the first 2 weeks

20
Q

What is the critical period?

A

This is the embryonic phase which is 3-8 weeks. The embryo is most vulnerable to teratogens during this period.