Oral And Nasal Cavity

Question 1

Stomodeum

Answer 1

Oral cavity formed by depression of arch 1

Question 2

After the medial and lateral nasal prominences are formed, what happens next?

Answer 2

Form nasal pit that will move dorsally, and will then form a sac (all ectoderm)

Question 3

How are the palate and conchae formed?

Answer 3

Nasal sac and stomodeum invaginate dorsally, the oronasal membrane degrades, then the nasal and oral cavity join forming a choanae and the primary plate

Question 4

Why are sinuses important and what is the process in which they’re formed?

Answer 4

They allow for stability, lighten the cranium, humidify air, and hone your speech. Diverticulation creates sinuses.

Question 5

What types of things line the sinuses?

Answer 5

Pseudo stratified columnar epithelium with cilia
Goblet cells - secret mucus
Lamina propria - connective tissue

Question 6

How is the paranasal sinus different?

Answer 6

Thinner than nasal mucosa with fewer goblet cells

Question 7

How are olfactory epithelia different?

Answer 7

Bipolar olfactory nerve cells, formed from ectoderm, attach to olfactory bulb

Question 8

Summarize development of the mandible

Answer 8

There are two bulges from the stomodeum = meckel’s cartilage that will help direct mandibular formation. Where the two sides of the cartilage meet is a symphysis where there is a lateral condensation of mesenchymal cells and ossification begins

Question 9

What is the name for the lip surface proper?

Answer 9

Vermillion zone and border

Question 10

Types of sinuses

Answer 10

Frontal (x2), ethmoidal, maxillary (x2), sphenoid

Question 11

What type of cells make the tongue?

Answer 11

Occipital somites