Orofacial Development: Nose Formation

Question 1

what does the FN process give rise to

Answer 1

forehead, nose, philtrum, premaxilla with 4 incisors

Question 2

what does PA 1 max give rise to

Answer 2

cheeks, upper jaw, lip, hard and soft (definitive) palate

Question 3

what does PA 1 mand give rise to

Answer 3

lower jaw, lower lip

Question 4

what 3 embryonic structures does the nose originate from

Answer 4

1. Nasal sensory placode (thickening ectoderm) -> nasal pit (depression); sensory placodes differentiate into the epithelium of sensory organs
2. Frontonasal process/prominence (FNP) – ectomesenchyme proliferation
3. Anterior cranial base/cartilaginous nasal capsule - ectomesenchyme proliferation

Question 5

what forms the external nose

Answer 5

FNP

Question 6

what does your FNP form into

Answer 6

MNP and LNP

Question 7

what forms your internal nose

Answer 7

anterior cranial base of skull which forms a cart. nasal capsule

Question 8

what does you cart nasal capsule form

Answer 8

a medial and lateral wall

Question 9

Nasal capsule ossifies to form the future

Answer 9

ethmoid bone

Question 10

______ contributes to most supporting structures inside the
nasal cavity

Answer 10

Ethmoid bone

Question 11

ectodermal thickening in region of FN forms nasal epithelium (PSCC)

Answer 11

nasal sensory placode

Question 12

invagination of nasal placode forms a small depression between the medial and lateral nasal process forms nostril/ nasal cavity/ sinsuses

Answer 12

nasal pit formation

Question 13

what do the medial nasal processes merge together to form

Answer 13

tip and bridge of nose and intermaxillary segment- part of philtrum of lip and primary palate

Question 14

what does the fusion of the bucconasal groove form

Answer 14

Medial nasal process merges with maxillary process Forms lateral upper lip

Question 15

what does the fusion of the nasolacrimal groove form

Answer 15

Ectodermal groove develops from medial corner of eye Lies between maxillary and lateral nasal process Maxillary and lateral merge and cover groove
Groove becomes nasolacrimal duct and sac drains into nasal cavity

Question 16

lateral nasal process merges with max process to form

Answer 16

external side of nose, alar cart, and lateral cartilage

Question 17

what is the embryological defect in a cleft

Answer 17

failure of medial nasal processes to merge together

Question 18

what is an oblique facial cleft

Answer 18

persistent groove from inner eye to ala of nose

Question 19

what serves as the embryonic
origin for the nose, premaxilla and philtrum of lip

Answer 19

FN process

Question 20

The embryonic origin of external nose

Answer 20

FN region

Question 21

D. P. for alar and lateral nasal cart

Answer 21

LNP

Question 22

D.P. for nasal bones

Answer 22

MNP

Question 23

what does the internal nose develop from

Answer 23

ant cranial base

Question 24

what does the ant cranial base form

Answer 24

cart nasal capsule

Question 25

what does the cart nasal capsule divide into

Answer 25

medial wall and lateral wall

Question 26

medial nasal septum gives rise to

Answer 26

septal cart and perp plate of ethmoid bone

Question 27

lateral nasal septum gives rise to

Answer 27

sup and middle conchae and meatuses