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Flashcards in development of head and neck Deck (49):
1

what membrane becomes the mouth?

oropharyngeal membrane

2

review: whats philtrum?

the dimple between your upper lip and septum of nose; its made of the frontonasal process

3

what four things are contained in a pharyngeal arch?

arch cartilage, arch cranial nerve, arch artery, condensation of mesenchymal tissue that will make the muscles

4

what arch does malleus and incus come from

trigeminal innervates the little muscle that tenses the tympanic membrane, so this is first arch

5

what arch does stapes come from

stapedius attaches to this. that muscle is VII, so this is second pharyngeal arch

6

what does PHA mean? PHP?

for me, it means pharyngeal arch and pharyngeal pouch. i'm tired of typing them

7

what are the divisions of the hind brain? does the midbrain and forebrain divide?

rhombomeres; this is only in the hindbrain

8

what are the divisions of the paraxial mesoderm?

these are somitomeres for mm. of the eye. its the name for proximal somites

9

name for bulges that come off the gut tube?

pharyngeal pouches. like the lung bud, thyroid bud

10

T/F there is a blood vessel for each arch

TRUUUUEEE!!!

11

what should you appreciate?

a lot of things up here come from neural crest (neural ectoderm that turns into mesoderm stuff) its really complicated, so don't learn this stuff but know it exists

12

why does recurrent laryngeal nerve (5th PHA) wrap around the subclavian(4th PHA)?

the 5th aortic arch disappeared

13

which part of the jaw fuses first?

the MANdible.

14

what are the two parts of the skull that develop?

the neurocranium(skull part) and the viscerocranium (face part)

15

everything is cartilaginous for neurocranium except for?

parietal, frontal, and a little bit of the occipital

16

premature fusion of the coronal suture called? saggital?

brachocephaly; scaphencephaly

17

t/f muscles of the tongue come from PHAs

false. they come from myotome

18

what are some weird things that neural crest cells form

melanocytes, all the ganglions, schwaan cells, meckel's cartilage (pha 1), dentine of teeth

19

placode is

a dense condensation of ectodermal tissue that gives rise to different strxs of the head and neck

20

pha 3 is what cn

IX

21

pha 4,6 is what cn

X

22

which cns are actually from somitomeres/somites

III, IV, VI, XII

23

PHAs of hyoid

second (upper half), third (lower half)

24

fourth PHA

thyroid cartilage

25

first arch syndrome

low set ears, malformation of malleus and/or incus, small lower jaw, auricle of ear is misshapen
**subforms of this are treacher collins and goldenhar syndrome

26

agnathia

no formation of the lower jaw

27

what chart do you need to know

the chart with arch, nerve, muscles, skeletal strxs, ligaments for PHAs

28

thyroid begins at this thing

foramen cecum

29

prominences of the first PHA

maxillary, mandibular

30

two things that make the pituitary gland

infundibulum of BRAIN (posterior lobe) and Rathke's pouch (anterior lobe). these are actually from the stomodeum (roof of mouth)

31

where does tympanic membrane develop

between first pouch and first groove; this is why the tympanic membrane has three parts :ecto, meso, endoderm

32

eustacian tube opens up into pharynx because

it came from the first PHP which came from the pharynx

33

tonsillar fossa is from

the second PHP

34

what is the cervical sinus

the outside groove between the 2nd to 4th PHAs. this can remain open and you get a weird BB condition =>branchial cyst or fistula on LATERAL SIDE OF NECK

35

ultimobranchial body

fourth PHP. parathyroid from this

36

cyst in the midline of the neck

thyroglossal duct cyst. THIS is in the midline. the other (branchial) is LATERAL

37

tongue is INITIALLY derived from what PHAs

1,2,3,4

38

the final tongue product is made from what PHAs

1,3,4. the second one gets overgrown BUT there are still some taste buds (SVA) from VII on anterior 2/3 of the tongue. posterior 1/3 has GVA, SVA from IX

39

the three processes that make the face?

frontonasal (containing the nasal placode), maxillary, mandibular for face . the palate has a palatine process

40

the incisors (front four teeth) from?

premaxillary part of maxilla

41

the lateral part of the palate from? joining called?

palatine process; palatal raphe

42

retina, pigment comes from what structure?

optic cup. its brain (diencephalon). if the two layers of the cup split, then you get retinal detachment

43

sclera, choroid is from what germ layer

mesoderm

44

lens is from what germ layer

ectoderm

45

nasoplacode gives rise to the nose like ___ gives rise to the otic vessicle

otic placode. it eventually forms the cochlea

46

there are lots of??

flashcards. sorry, but you're almost done!!

47

mastoid aircells from what?

first groove

48

what PHA is the external ear?

first

49

microtia?

rudimentary auricle; usuallly part of first arch syndrome