Chapter 2 pt.4

Question 1

What are the 3 periods of prenatal development

Answer 1

Germinal Stage (first 2 weeks, conception to implantation)
Embryonic Stage (3rd-8th week)
Fetal Stage (3rd month until birth)

Question 2

The inner part of the blastocyst has 2 distinct layers that form a thickened mass of cells called the ____ ____.

Answer 2

Embryonic Disk

Question 3

What is the difference between “Cephalocaudal” and “Proximodistal” trends

Answer 3

Cephalocaudal = Development from head to tail
Procimodistal = Inner part of the body (axis) and outward

Question 4

What is the “Ectoderm”

Answer 4

the outermost cell layer of a newly formed embryo, from which the skin and nervous system develop

Question 5

What is a Neural Tube

Answer 5

hallowed-out area in the blastocyst where the nervous system develops

Question 6

What is the “Endoderm”

Answer 6

the inner layer of the embryo where the lungs and digestive system develop

Question 7

What is the “Mesoderm”

Answer 7

The central layer of the embryo where the bones and muscles develop

Question 8

What is Rubella

Answer 8

a viral infection that can cause retardation and heart disease on the embryo (also called German measles)