Chapter 3: Basic Embryology

Question 1

What is Embryology

Answer 1

The study of the origin and development of an individual person

Question 2

Why study embryology

Answer 2

1. By knowing how the body methodically assembles itself, you will better understand adult anatomy
2. Embryology helps to explain the organ of many birth defects, anatomical abnormalities that are evident in about 3% of live births

Question 3

Distinguis the embryonic period from the fetal period of development

Answer 3

1. Prenatal period: the time b/w conception and birth
   a. Embryonic period: first 8 weeks
   b. Fetal period: the remaining 30 weeks

Question 4

During which prenatal period is the basic body plan established?

Answer 4

The Embryonic period: organs form from 3 primary germ layers. The basic body plan emerges

Question 5

Basic body plan development

Answer 5

1. Skin: epidermis and dermis
2. Outer body wall: consists of trunk muscles; vertebral column (spinal cord), and ribs
3. Body cavity and inner tube
   - Inner tube: respiratory and digestive structures;
4. Kidneys and gonads
5. Limbs