Development

Question 1

Brachial arch 1

Answer 1

a: maxillary
n: trigeminal

m: mastication, tensor tympani, mylohyoid, tensor veli palatini, ant. digastric
bone: malleus, incus, sphenomandibular lig, Meckel’s cartilage

Question 2

Brachial pouch 1

Answer 2

middle ear
auditory tube
tympanic membrane
EAM

Question 3

Brachial arch 2

Answer 3

a: hyoid, stapedial
n: facial
m: facial expression, stapedius, stylohyoid, post digastric
skeletal: stapes, styloid process, stylohyoid ligament, lesser hyoid

Question 4

Brachial pouch 2

Answer 4

supra-tonsillar fossa
lymph nodule
palatine tonsil
copula: post 1/3 tongue

Question 5

Brachial arch 3

Answer 5

a: ICA
n: glossopharyngeal
m: styopharyngeaus
skeletal: greater hyoid

Question 6

Brachial pouch 3

Answer 6

thymus
inf parathyroid
hypobrahcial eminence: post 1/3 tongue

Question 7

Brachial arch 4

Answer 7

a: R subclavian, aorta
n: vagus
m: pharyngeal and laryngeal m.
skeletal: laryngeal cartilage

Question 8

Brachial pouch 4

Answer 8

superior parathyroid

post (ultimo) brachial bodies: thyroid parafollicular (C) cells

Question 9

Brachial arch 5

Answer 9

regresses

Question 10

Brachial arch 6

Answer 10

a: pulmonary, ductus arterosis
n: vagus, recurrent laryngeal
m: laryngeal m (not cricothyroid)
skeletal: cricoid, arytenoid, corniculate cartilage

Question 11

Where does the thyroid gland derive from?

Answer 11

foramen cecum (thyroglossal duct)

Question 12

The ant 2/3 of tongue come from what brachial arches?

Answer 12

1, 2, 3
tuberculum impar
lateral lingual swellings

Question 13

What week does the upper lip and tongue develop?

Answer 13

4

Question 14

What week does the primary palate develop?

Answer 14

5

Question 15

What forms during the 6th week?

Answer 15

parotid gland
secondary palate
beginning of tooth formation

Question 16

When does the submandibular gland form?

Answer 16

week 7

Question 17

When does the sublingual gland form?

Answer 17

week 8

Question 18

By what week does the embryo have mature palate?

Answer 18

12

Question 19

Where does the pituitary gland derive from?

Answer 19

stomatodeum (glandular)

diencephalon neuroectoderm

Question 20

What forms from Rathke’s pouch?

Answer 20

adenohypophyses

Question 21

What tissues does the thymus derive from?

Answer 21

mesenchyme

epithelium

Question 22

vertebrae come from what tissue?

Answer 22

somites

Question 23

What comes from epiblast (primary ectoderm) ?

Answer 23

amniotic cavity
ectoderm
mesoderm

Question 24

What comes from hypoblast (primary endoderm)?

Answer 24

lining of yolk sac

Question 25

Ectoderm derivatives

Answer 25

epithelium of skin brain and spinal cord (NT) PNS (NC)

Question 26

Endoderm derivatives

Answer 26

``` lining of body cavities gonads respiratory system liver pancreas end of GU system ```

Question 27

Mesoderm derivaties

Answer 27

CT: cartilage, bone, blood, muscle CV Repro GU

Question 28

What are the pharyngeal derivatives?

Answer 28

palatine tonsils thymus thyroid parathyroid

Question 29

What do somites form?

Answer 29

sclerotome dermatome myotome

Question 30

What to sclerotome form?

Answer 30

vertebrae | ribs

Question 31

What do dermatomes form

Answer 31

skin (dermis)

Question 32

What do myotomes form

Answer 32

skeletal m

Question 33

What does the alar plate form?

Answer 33

sensory (post/dorsal) n

Question 34

What does the basal plate form?

Answer 34

motor (ant/ventral) n

Question 35

What are the neural crest derivatives?

Answer 35

``` sensory ganglia: V, VII, IX, X DRG Schwann cells Melanocytes Odontoblasts Enterochromaffin cells adrenal medulla pia and arachnoid mater Meninges Parafollicular cells ```

Question 36

Where do microglia come from?

Answer 36

mesenchymal cells

Question 37

What are ectodermal derivatives of the GI tract?

Answer 37

``` oropharynx mucosa tongue lips parotid enamel rectum anus ```

Question 38

What type of bone formation makes the mandible and maxilla (minus the condyles)?

Answer 38

intramembranous

Question 39

What is the vestibular lamina?

Answer 39

separates the lips and cheeks externally and jaw structures internally in the developing embryo

Question 40

Intramembranous ossification

Answer 40

from mesenchymal cells | ex: flat bones, mandibular body, maxilla, clavicle

Question 41

Endochondrial ossification

Answer 41

from hyaline cartilage | ex: mand condyles, long bones

Question 42

Appositional growth occurs in what type of ossification

Answer 42

intramembranous | endochondrial

Question 43

Intertisital growth occurs in what type of ossification

Answer 43

endochondrial

Question 44

where do m. of tongue derive from?

Answer 44

occipital somites (myotomes)

Question 45

brachial arches that make the tongue?

Answer 45

1 thru 4 | 4 = epiglottis

Question 46

What reaction prevents polyspermy?

Answer 46

zona reaction (changes zona pellucida)

Question 47

What makes up a blastocyst?

Answer 47

embryoblast yolk sac trophoblast

Question 48

what produces HcG

Answer 48

chorion

Question 49

by what week is nasal placodes developed

Answer 49

week 5

Question 50

by what week is the lip, jaw, and palatal shelves formed

Answer 50

7

Question 51

what is formed at week 10

Answer 51

nasolacrimal duct | maxillary prominences