Development of the face

Question 1

What are the 5 swellings that form on the developing face?

Answer 1

Frontonasal prominence
2x maxillary
2x mandibular

Question 2

Why must the epithelium that covers the structures die?

Answer 2

Epithelium will not fuse, must die so mesoderm can fuse

Question 3

How does the central portion of the nose form?

Answer 3

The medial nasal swellings on either side get pushed together as they grow and fuse in the midline

Question 4

Where does the nasolacrimal duct form?

Answer 4

Between the fusion of the lateral nasal swelling and the maxillary swelling

Question 5

What derives from the frontonasal prominence?

Answer 5

Forehead, nose, Philtrum, primary palate

Question 6

What is derived from the maxillary prominence?

Answer 6

Upper part of cheek, maxilla, zygomatic bone, upper lip, secondary palate

Question 7

What is derived from the mandibular prominence?

Answer 7

Lower lip, lower part of cheek, mandible

Question 8

What swelling is the forehead derived from?

Answer 8

Frontonasal

Question 9

What swelling is the Philtrum derived from?

Answer 9

Frontonasal

Question 10

What swelling is the nose derived from?

Answer 10

Frontonasal

Question 11

What swelling is the primary palate derived from?

Answer 11

Frontonasal

Question 12

What swelling is the upper part of cheek derived from?

Answer 12

Maxillary

Question 13

What swelling is the zygomatic bone derived from?

Answer 13

Maxillary

Question 14

What swelling is the upper lip and secondary palate derived from?

Answer 14

Maxillary

Question 15

What swelling is the lower cheek and mandible derived from?

Answer 15

Mandibular

Question 16

At how many days in utero does the tongue start to develop?

Answer 16

28 days

Question 17

What are the 2 swelling soft the tongue?

Answer 17

Tuberculum impar and hypobranchial eminence

Question 18

What pharyngeal arch does the tubercular impair grow from?

Answer 18

Pharyngeal arch I

Question 19

What does the tubercular impar form?

Answer 19

The anterior 2/3 of tongue

Question 20

What CN innervates pharyngeal arch I hence what CN innervates the anterior 2/3 of tongue?

Answer 20

V (and chord tympani)

V3 and chord tympani

Question 21

From which pharyngeal arch is the hypobranchial eminence derived from?

Answer 21

Pharyngeal arch II, III, IV

Question 22

What does the hypobranchial eminence form?

Answer 22

3rd and 4th arch overgrow 2nd arch form the posterior 1/3 of tongue

Question 23

What innervates the 3rd pharyngeal arch and hence the posterior 1/3 of tongue?

Answer 23

IX

Question 24

What gives rise to the tongue muscles?

a) occipital somites
b) pharyngeal arch IV
c) pharyngeal pouch 4
d) pharyngeal arch III

Answer 24

a

Question 25

What innervates the muscles of the tongue?

Answer 25

XII

Question 26

From which pharyngeal arch is the epiglottis and arytenoid swellings derived?

Answer 26

IV

Question 27

What creates the inter maxillary segment?

Answer 27

Fusion of the medial nasal prominences

Question 28

What does the inter maxillary segment form?

Answer 28

Primary palate

Question 29

What prominence is the primary palate formed from?

Answer 29

Frontonasal

Question 30

What prominence is the secondary palate formed from?

Answer 30

Maxillary

Question 31

What rooms from the maxillary prominence that will go on to form the secondary palate?

Answer 31

Palatal shelves

Question 32

What happens as the palatal shelves grow?

Answer 32

Grow and shed epithelium, mesoderm fuse in the midline

Question 33

What forms the primary palate?

Answer 33

Fusion of the medial nasal plates of the Frontonasal prominence