Head and neck dev

Question 1

membrane that will become mouth

Answer 1

oropharyngeal membrane

Question 2

ant. space similar to proctodeum

Answer 2

stomatodeum

Question 3

cause of dev. of frontonasal prominence

Answer 3

proliferation of mesoderm and neural crest cells

Question 4

organs derived by mesoderm and neural crest cells

Answer 4

mesoderm- skeletal muscle and epithelial cells

crest cells- bone and connective tissue of face and ganglia of head and neck

Question 5

number of arches back from prominence

Answer 5

6

Question 6

contents of each arch (4)

Answer 6

1. artery
2. cartilege
3. muscle
4. cranial nerve

Question 7

portions that dev into face and palate

Answer 7

frontonasal prominence and 1st arch

Question 8

divisions of 1st arch

Answer 8

maxiallary and mandibular prominences

Question 9

pit in between all the prominences

Answer 9

stomatodeum

Question 10

what will become the nose

Answer 10

olfactory placodes>olfactory pits

Question 11

what is formed from mandibular prom

Answer 11

jaw

Question 12

what creates primary palate

Answer 12

medial nasal prominence

Question 13

separation between lat nasal and max prominence

Answer 13

nasolacrimal groove > nasolacrimal duct

Question 14

derivatives of frontonasal prominence

Answer 14

forehead, nasal bridge, nasal sept

Question 15

derivatives of medial nasal prom

Answer 15

primary palate, philtrum of upper lip, tip of nasal septum

Question 16

derivatives of lat nasal prom

Answer 16

ala of nose

Question 17

derivatives of max prom

Answer 17

maxilla and lat upper lip

Question 18

derivatives of mandibular priom

Answer 18

jaw and lower lip

Question 19

prob with medial nasal and max fusion

Answer 19

cleft lip

Question 20

prob with max and mandibular fusion

Answer 20

macrostomia

Question 21

prob with lat nasal and max fusion

Answer 21

oblique facial cleft

Question 22

2 sources of palate

Answer 22

1. medial nasal - promiary palate (ant.)

2. palatal process of maxilla - post palate including soft

Question 23

arch # and corresponding cranial nerve

Answer 23

1 - 5
2 - 7
3 - 9
4 - 10

Question 24

prominences developed by trigeminal

Answer 24

V1 - frontonasal
V2 - maxiallary
V3 - mandibular

Question 25

external and internal division of arches

Answer 25

external - pharyngeal grooves | internal - pharyngeal pouch

Question 26

fate of 4 pharyngeal grooves

Answer 26

1. becomes auditory meatus | 2-4. covered by caudal drift of 2nd arch to become cervical sinuses

Question 27

fate of 4 pharyngeal pouches

Answer 27

1. middle ear chamber and auditory tube 2. palatine fossa 3. ventral - thymus, dorsal - inf parathyroid glands 4. dorsal - sup parathyroid glands, ventral become calcitonin secreting aspect of thyroid

Question 28

tissues creating tympanic membrane

Answer 28

ectoderm of 1st pharyngeal groove meeting endoderm of 1st pharyngeal pouch

Question 29

fate if cartilage of 4 arches

Answer 29

1. Meckle's - mandible, sphenomandibular ligament, malleus, incus 2. Reicherts - stapes, styloid process, lesser horn of hyoid 3. greater horn of hyoid 4. laryngeal cartiledges

Question 30

muscles of 4 arches

Answer 30

1. muscles of mastication, mylohyoid, anterior digastric, tensor tympani, tensor palatini 2. muscles of facial expresion, posterior digastric, stylohyoid, stapedius 3. stylopharyngeus 4. levator palatini, muscles of pharynx and larynx

Question 31

arteries of the 4 arches

Answer 31

1. none 2. none 3. common carotids and proximal internal carotid 4. left- aortic arch, right - subclavian 5. none 6. pulmonary arteries

Question 32

point of origin of thyroid

Answer 32

b/w 1 and 2 arches

Question 33

point of dev of pit cland (2)

Answer 33

ant. - ectoderm in roof of stomatodeum | post - outgrowth of neuroectoderm of neural tune near hypothalamus

Question 34

arches where tongue develops from

Answer 34

ant 2/3 - 1st arch (trigeminal) post 2/3 - 3 and 4 (glosso and vagus) skeletal muscle from somites

Question 35

arteries of the 4 arches

Answer 35

1. none 2. none 3. common carotids and proximal internal carotid 4. left- aortic arch, right - subclavian 5. none 6. pulmonary arteries

Question 36

point of origin of thyroid

Answer 36

b/w 1 and 2 arches

Question 37

point of dev of pit cland (2)

Answer 37

ant. - ectoderm in roof of stomatodeum | post - outgrowth of neuroectoderm of neural tune near hypothalamus

Question 38

arches where tongue develops from

Answer 38

ant 2/3 - 1st arch (trigeminal) post 2/3 - 3 and 4 (glosso and vagus) skeletal muscle from somites

Question 39

tissue source for thyroid

Answer 39

endoderm b/w arches

Question 40

which pouch becomes ant. pit

Answer 40

rathkes pouch (ectoderm)

Question 41

time thyroid reaches final position

Answer 41

7th week

Question 42

passage through which thyroid descends

Answer 42

thyroglossal duct (midline)