lect 13- skull, face and teeth: development

Question 1

what are thickenings of neural crest-like cells that remain in surface ectoderm

Answer 1

placodes

Question 2

what do placodes in general give rise to

Answer 2

special sensory structures

Question 3

what are some non-neural structures that the placodes give rise to

Answer 3

lens of the eyes and rathke’s pouch

Question 4

what is the part of the skull formed from the pharyngeal arches (forces face)

Answer 4

viscerocranium

Question 5

what is the braincase

Answer 5

neurocranium

Question 6

what is another name for the 1st pharyngeal arch

Answer 6

mandibular

Question 7

what is another name for the second pharyngeal arch

Answer 7

hyoid

Question 8

what are the swellings of the first pharyngeal arch surrounding the stomodeum

Answer 8

maxillary and mandibular prominences

Question 9

what is the paired thickenings of the epithelium that pit in 5th week (induced by underlying brain)

Answer 9

nasal placode

Question 10

what is the opening via invagination of ectoderm

Answer 10

stomodeum

Question 11

what separates the stomodeum from foregut

Answer 11

oropharyngeal membrane

Question 12

what does the floor of the nasalacrimal groove between the maxilla and lateral nasal prominence canalize into

Answer 12

superior lacrimal sac and nasolacrimal duct

Question 13

what structures are formed from the frontonasal prominence

Answer 13

forehead and bridge of nose

Question 14

what structures are formed form the maxillary prominence

Answer 14

cheeks and lateral portion of upper lip

Question 15

what structures are formed from the medial nasal prominence

Answer 15

philtrum of upper lip, crest and tip of nose

Question 16

what structures are formed from lateral nasal prominence

Answer 16

alae of nose

Question 17

what structures are formed for the mandibular prominence

Answer 17

lower lip

Question 18

what does the ophthalmic nerve innervate (from the 1st pharyngeal arch)

Answer 18

scalp of forehead, upper eyelid, conjunctiva and cornea of eye bridge and tip of nose

Question 19

what does the maxillary nerve innervate (from the 1st pharyngeal arch)

Answer 19

lower eyelid, cheeps, upper lip and alae of nose

Question 20

what does the mandibular nerve innervate (from the first pharyngeal arch)

Answer 20

lower lip and lower jaw

Question 21

what forms the primary palate

Answer 21

medial nasal prominence

Question 22

what forms the secondary palate

Answer 22

maxilla

Question 23

what marks the junction of the primary and secondary palates

Answer 23

incisive foramen

Question 24

what occurs with median cleft of the lower lip

Answer 24

failure of the left and right mandibular prominences to fuse

Question 25

what occurs wit medial cleft of upper lip

Answer 25

failure of left and right medial nasal prominences to fuse

Question 26

what occurs with complete unilateral cleft of the upper lip and unilateral cleft of the primary palate

Answer 26

failure of the maxillary and medial nasal prominences to fuse

Question 27

what occurs with bilateral cleft of the secondary palate

Answer 27

failure of left and right palatine shelves to fuse

Question 28

what happens with macrostomia

Answer 28

failure of maxillary and mandibular processes to fuse

Question 29

what happens with microstomia

Answer 29

excessive fusion of maxillary and mandibular prominences

Question 30

how many deciduous teeth are there

Answer 30

20

Question 31

how many permanent teeth should adults have

Answer 31

32