Oral Anatomy chapter8

Embryology

study of the formation and development of an embryo and fetus

Histology

the study of the structure and function of tissues on a microscopic level

Pregnancy begins with

conception

Another name for conception

fertilization (another name)

Gestation

the period from fertilization to birth

What is a normal pregnancy duration

9 months from conception to birth, or 38 weeks from LMP

When is the sex of the baby established

at conception or revealed by ultrasound as early as 14 weeks

The germinal period takes place during

the first 2 weeks (prenatal development)

The embryonic period takes place during

third week -eighth week (prenatal development)

What is the most critical prenatal development period and why?

The embryonic period because, during these weeks, development begins in all major structures of the body

The fetal period takes place during

the ninth week and lasts until birth (prenatal development)

The zygote is present during what period

( present during) The germinal period

The embryo is present during with period

( present during) The embryonic period

The fetus is present in what period

( present during) The fetal period

The fetal stage is

a period of growth and maturation

What are the embryonic layers

ectoderm, mesoderm, and endoderm

The Ectoderm forms what structures

Skin, brain, spinal cord, hair, nails, enamel of teeth (embryonic dev)

The mesoderm form what structures:

Bones, muscles, Circulatory & Reproductive systems, kidneys, ducts, Lining of abdominal cavity, Dentin, pulp, and cementum of teeth (embryonic dev)

The Endoderm forms what structures

Lining of digestive system, Lining of lungs (embryonic dev)

What is the stomodeum

primitive mouth

The first branchial arch forms

the bones, muscles, and nerves of the face (branchial arch)

The second branchial arch forms the

stapes of the ear and part of the hyoid bone (branchial arch)

The third branchial arch forms the

posterior tongue (branchial arch)

The palate is formed from two separate embryonic structures called

primary palate and the secondary palate

When do the primary palate and the secondary palate form

During the fifth week (palates)

When does the anterior fusion of the palates usually begin

during the ninth week (palates)

When is the palate completed

during the twelfth week within the fetal period (palate)

Weeks of palates formation

5th,9th,12th

The development of the human face occurs during

the fifth and eighth week (developments)

The first branchial arch is also called

Mandibular arch (also called)

The second branch arch is also called

Hyoid arch (Also known as)