Development of Face

Question 1

The face develops from

Answer 1

five swellings/processes that form around
primitive mouth (stomodeum)

Question 2

These processes are

Answer 2

Single frontonasal process
Paired maxillary processes
Paired mandibular processes

Question 2

five swellings (facial
primordia) appear around the primitive mouth
(stomodeum) at what week

Answer 2

at the end of 4th week

Question 3

The five facial primordia consist mainly of

Answer 3

mesenchyme (derived from neural crest cells) covered by an
ectoderm.

Question 4

The maxillary and mandibular prominences are derivatives of the

Answer 4

1st pharyngeal arch

Question 5

The frontonasal process is formed by

Answer 5

the proliferation of mesenchyme lying ventral to forebrain

Question 6

Frontonasal process forms what

Answer 6

middle part of the upper border
of the stomodeum.

Question 7

The paired maxillary processes form

Answer 7

the lateral parts of the upper border of the
stomodeum.

Question 8

The paired mandibular processes form

Answer 8

the lower border of the stomodeum.

Question 9

Frontonasal prominence forms

Answer 9

forehead
external nose (dorsum and apex)

Question 10

Maxillary prominence form

Answer 10

lateral parts of the upper lip
upper parts of the cheek

Question 11

Mandibular prominence form

Answer 11

jaw
lower lip
lower parts of the cheek.

Question 12

On each side of the median plane in the ventrolateral part of frontonasal process, the surface ectoderm thickens to form

Answer 12

Olfactory placode or nasal placode

Question 13

The olfactory placodes invaginate into the underlying mesoderm to form

Answer 13

olfactory pits or nasal pits at the 5th week

Question 14

Olfactory or nasal pit are continuous below with

Answer 14

The stomodeum

Question 15

The mesenchyme around
margins of nasal pits proliferate to form

Answer 15

nasal prominences

Question 16

Medial half of nasal prominence is called

Answer 16

medial nasal prominence

Question 17

Lateral half of nasal prominence is called

Answer 17

lateral nasal prominence

Question 18

Maxillary process fuses with

Answer 18

medial nasal and lateral nasal prominences

Question 19

Fusion of maxillary and mandibular processes form

Answer 19

the cheek

Question 20

Fusion of maxillary and mandibular processes and fusion of the mandibular process causes what

Answer 20

narrowing of the mouth

Question 21

The medial nasal prominences extend more towards the
stomodeum and form

Answer 21

the intermaxillary segments which are separated by a small triangular notch.

Question 22

The olfactory pits grow deeper to form

Answer 22

nasal cavities-1

Question 23

The median nasal prominence thins out gradually to form

Answer 23

primitive nasal septum -2

Question 24

The intermaxillary segments of medial nasal prominence fuse to form

Answer 24

Philtrum of the upper lip-labial component.

Upper jaw component that carries four incisor teeth.

Palatal component that forms premaxilla

Question 25

The surface opening of stomodeum forms

Answer 25

oral fissure-6

Question 26

Lateral angles of the oral fissure are formed by

Answer 26

fusion of maxillary and mandibular processes -6b

Question 27

Forehead is innervated by

Answer 27

Ophthalmic
division of Vth
nerve

Question 28

nose is innervated by

Answer 28

Ophthalmic division
of Vth nerve

Question 28

upper part of cheek is innervated by

Answer 28

Maxillary division
of Vth nerve

Question 29

lower part of cheek is innervated by

Answer 29

Mandibular division
of Vth nerve

Question 30

Upper lip is innervated by

Answer 30

Maxillary division of
Vth nerve

Question 31

Lower lip is innervated by

Answer 31

Mandibular division
of Vth nerve

Question 32

Upper lip is formed by

Answer 32

Fusion of maxillary processes with the medial nasal prominence

Question 33

The lateral nasal prominences form

Answer 33

ala and sides of nose

Question 34

The medial nasal prominences form

Answer 34

nasal septum
nasal cavity
philtrum of upper lip

Question 35

the maxillary and lateral nasal
prominences are separated by a deep groove called

Answer 35

nasolacrimal groove

Question 36

The ectoderm in floor of this groove proliferates
to form

Answer 36

solid ectodermal cord

Question 37

the ectodermal cord is detached from the surface ectoderm and gets canalized to form

Answer 37

nasolacrimal duct

Question 38

Upper end of nasolacrimal duct widens to form

Answer 38

nasolacrimal sac

Question 39

When does the nasolacrimal duct becomes completely patent

Answer 39

after birth

Question 40

Communications of nasolacrimal duct

Answer 40

It communicates secondarily with the nasal cavity at
its caudal end and with the conjunctival sac at its
cephalic end

Question 41

Nasolacrimal duct runs from

Answer 41

medial angle of the eye to inferior meatus of the nasal
cavity.