Decks Embryology

Question 1

tongue develops begins development in what week

Answer 1

4th

Question 2

3 major salivary glands begin development in what weeks

Answer 2

6-8th

Question 3

1st salivary gland to develop and time

Answer 3

parotid 6th week

Question 4

2nd salivary gland to develop and time

Answer 4

submandibular gland late 6th week

Question 5

3rd salivary gland to develop and time

Answer 5

sublingual gland 8th week

Question 6

tongue appears in the 4th week first as how many swellings

Answer 6

2 lateral and one medial swellings.

Question 7

2 lateral and one medial swellings originate from _ arch

Answer 7

1st branchial arch

Question 8

the medial swelling of the tongue that forms the anterior 2/3 of the tongue (body of the tongue) is called the

Answer 8

tuberculum impar

Question 9

the other median swelling is the ___

Answer 9

copula

Question 10

copula is formed by mesoderm of what arches

Answer 10

2-4th arches

Question 11

the 2 lateral tongue swellings overgrow the tuberculum impar and merge together to form the

Answer 11

anterior 2/3 of the tongue

Question 12

the posterior 3rd of the tongue originates from what arches

Answer 12

2, 3, 4th

Question 13

the extreme posterior part of the tongue what arch

Answer 13

4th

Question 14

the anterior 2/3 of the tongue is separated by the posterior 1/3 by the

Answer 14

terminal sulcus = V shaped groove

Question 15

foramen cecum is remnant of the proximal end of the

Answer 15

thyroglossal duct

Question 16

branchial clefts are _ origin

Answer 16

ectoderm (think eCtoderm)

Question 17

the branchial pouches are _ origin

Answer 17

endoderm

Question 18

how many branchial arches and what shape

Answer 18

6 U shaped

Question 19

core of branchial arches is

Answer 19

mesenchyme formed from mesoderm and neural crest cells that migrate to the neck

Question 20

parotid gland is derived from

Answer 20

ectoderm

Question 21

submandibular and sublingual glands derived from

Answer 21

endoderm

Question 22

which cartilages of branchial arches are derived from neural crest cells?

Answer 22

1st and 2nd

Question 23

which cartilages of branchial arches are derived from mesoderm

Answer 23

4-6th

Question 24

first branchial arch = _ cartilage derivatives

Answer 24

Meckel’s cartilage = ossified to form the malleus and incus of middle ear, sphenomandibular ligament and parts of the sphenoid bone

Question 25

bony mandible forms from _ ossification

Answer 25

intramembranous most of Meckel's cartilage disappears ONLY SOME of Meckel's cartilage makes a contribution to it. its fate is DISSOLUTION WITH MINOR CONTRIBUTIONS TO OSSIFICATION

Question 26

mandibulofacial dysostosis development defect affecting the derivatives of _ arch

Answer 26

1st = micrognathia (small lower jaw), malar (zygomatic hypoplasia), deformed lower rim of the orbit and ear. neural crest cells failed to migrate into arch

Question 27

second arch derivatives

Answer 27

reichert's cartilage = ossified to form stapes of middle ear, styloid process of temporal bone, the stylohyoid ligament, lesser cornu of the hyoid and upper half of body of hyoid

Question 28

which arches closely related to middle ear development

Answer 28

1 + 2

Question 29

third arch cartilage form the

Answer 29

greater cornu of hyoid bone and lower half of the body of the hyoid

Question 30

4-6th arches cartilage

Answer 30

laryngeal cartilages of the larynx (thyroid, cricoid, arytenoid, corniculate, cuneiform)

Question 31

cleft lip failure of fusion of

Answer 31

maxillary process and 2 medial nasal processes

Question 32

maxillary and mandibular processes fuse on the sides to form the

Answer 32

labial commissures (corners of the mouth)

Question 33

mandible forms from fusion of the right and left mandibular process in what week?

Answer 33

4th week.

Question 34

the _ is the first portion of the face to form AFTER the creation of the stomodeum

Answer 34

mandible

Question 35

maxilla formed by merging of the

Answer 35

2 maxillary processes of 1st branchial arch.

Question 36

maxilla also forms the

Answer 36

upper check regions and most of upper lip

Question 37

frontonasal process/prominence forms in what week

Answer 37

4th

Question 38

frontonasal process gives rise to

Answer 38

forehead, bridge of nose, primary palate, nasal septum and medial nasal processes

Question 39

nasal placodes in the anterior portion of he frontonasal. what part forms the alae of the nose

Answer 39

alae means sides- lateral nasal processes

Question 40

philtrum, portion of upper lip, and middle portion of nose form from fusion of the

Answer 40

medial nasal processes

Question 41

mandibular symphysis

Answer 41

ridge in midline on surface of the bony mandible where mandible is formed by fusion of the mandibular processes

Question 42

most of upper lip formed by

Answer 42

maxillary process

Question 43

palatine tonsils form from

Answer 43

2nd pharyngeal POUCH (remember it is inside = endodermal origin)

Question 44

inferior parathyroid form from

Answer 44

3rd pharyngeal pouch

Question 45

thymus forms from

Answer 45

3rd pharyngeal pouch

Question 46

superior parathyroids form from

Answer 46

4th pharyngeal pouch

Question 47

ultimobranchial bodies give rise to the _ cells of the thyroid

Answer 47

C

Question 48

ultimobranchial bodies arise from the

Answer 48

5th branchial pouch (or 4th in some books so look for either answer)

Question 49

tympanic membrane and cavity forms from the _ pouch

Answer 49

1st

Question 50

auditory tube and mastoid antrum form from the

Answer 50

1st pouch

Question 51

external auditory meatus formed from the

Answer 51

fist pharyngeal CLEFT (OUTSIDE)

Question 52

Digeorge syndrome = what's been affected

Answer 52

congenital malformation caused by underdevelopment of 3rd and 4th POUCHES leading to hypoplasia or absence of parathyroid glands = congenital heart defects and compromised immunity

Question 53

thyroid gland identifiable in what week

Answer 53

4th along with tongue

Question 54

first development of face development in the 4th wk is

Answer 54

disitntegration of the oropharyngeal membrane

Question 55

initial site of the thyroid gland is bw the

Answer 55

copula and tuberculum impar (foramen secum)

Question 56

thyroid gland descend through the thyroglossal duct to it permanent location below/above the thyroid cartilage?

Answer 56

below

Question 57

palate is completed during what week

Answer 57

12th

Question 58

primary palate forms first in what week

Answer 58

5th

Question 59

intermaxillary segment is the result of the fusion of ? what does it form

Answer 59

2 medial nasal processes and frontonasal processes = forms the primary palate

Question 60

secondary palate forms in what week

Answer 60

6th week (same as parotid gland time)

Question 61

secondary palate forms from

Answer 61

two palatal shelves aka lateral palatine processes of the maxillary process

Question 62

secondary palate is the

Answer 62

posterior 2/3 of the hard palate = canines and posterior teeth

Question 63

the primary palate forms first, then the second, then they both meet and fuse - completion of palate in what week

Answer 63

12

Question 64

nasal cavity formed by

Answer 64

nasal pits from the nasal placodes

Question 65

ligamentum teres in the adult comes from _ in the fetus

Answer 65

umbilical vein

Question 66

medial umbilical ligaments in the adult comes from _ in the fetus

Answer 66

umbilical arteries

Question 67

ligamentum arteriosum in the adult comes from _ in the fetus

Answer 67

ductus arteriosus

Question 68

ligamentum venosus in the adult comes from _ in the fetus

Answer 68

ductus venosus

Question 69

urachus in the adult comes from _ in the fetus

Answer 69

allantios

Question 70

nucleus pulposus in the adult comes from _ in the fetus

Answer 70

notochord