ANA 307 Nasal Cavity

Question 1

Discuss the development of the facial prominences in the mid face

Answer 1

At the end of the fourth week of fetal development mesenchymal cells of neural crest origin starts aggregates to form the facial prominence in the mid face

Question 2

What occurs after the development of the facial prominences

Answer 2

On either side of the frontonasal prominences nasal placards bilateral thickening of the surface of ectoderm are formed

Question 3

What occurs during fifth week of the development of the nasal cavity

Answer 3

During the fifth week the nasal placodes invaginate from the nasal pits and the tissue ridges surrounding the pits from the lateral and medial nasal prominences

The maxillary prominences continue to expand medially; shifting the medial nasal prominences toward the midline in the following 2 weeks

The two medial nasal prominences eventually fuse given rise to the medial portion of the upper lip and anterior palate

Question 4

How does cleft palate occur

Answer 4

Cleft palate occurs due to the failure of the lateral palatine processes to properly fuse

Question 5

Discuss the formation of the nasolacrimal duct

Answer 5

A furrow between the lateral nasal prominence and the maxillary prominence involutes to become the nasolacrimal duct

Question 6

What is the nasolacrimal duct

Answer 6

It connects the nose mouth and eyes

Question 7

The external nose is derived from how many facial prominences

Answer 7

5

Question 8

List the facial prominences and what they form

Answer 8

1. The frontal prominence forms the nasal bridge
2. The fused medial nasal prominences give rise to the lip
3. the lateral nasal prominences become the alae

Question 9

When do the paranasal sinuses begin to develop

Answer 9

During the eighth week of gestation

Question 10

Describe at first happens in the development of the paranasal sinuses

Answer 10

A series of folds on the lateral nasal wall called the ethmoturbinants that appear during 8 week of gestation 5-7 folds initially appear after process of fusion and regression 3 to 4 folds remain by week 15

Question 11

What is the origin and fate of these folds?

Answer 11

These folds are considered ethmoid on origin.and they ultimately become upper turbinants in the lateral nasal wall

Question 12

What occurs to the 1st ethmoturbinal?

Answer 12

It regresses during the Development period and remains at its rudimentary form

Question 13

The ascending portion becomes the___ and the descending potion forms the______

Answer 13

Aggernasi
Uncinate process

Question 14

What occurs to the 2nd ethmoturbinal?