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Ethmoid Bulla aka Oral Histology Exam 2 > PA Development And Adult PA Derivatives > Flashcards

PA Development And Adult PA Derivatives Flashcards

1
Q

What are the embryonic/developmental origin for the head and neck structures

A

Pharyngeal arches and frontonasal region

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2
Q

What PA and embryonic origin form the face adn pharynx

A

PA 1 and FN form the face.
PA 2,3,4,6 form pharynx

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3
Q

What germ layer covers the external surfaces and lines oral cavity proper

A

Ectoderm

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4
Q

What germ layers form the central core mesoderm

A

PA head mesoderm and ectomesenchyme

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5
Q

What germ layer internal line the lumen of pharynx

A

Endoderm

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6
Q

What germ layer differentiates into motor and sensory neutrons to innervate each arch

A

Neuroectoderm/ neural crest

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7
Q

What does each arch contain

A

Epithelium, CT, muscle, nervous component

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8
Q

What do the germ layers of each specific pharyngeal arch give rise to

A

Pharyngeal arch derivatives

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9
Q

________ provide motor and sensory innervation to the pharyngeal arch derivatives

A

Cranial nerves

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10
Q

T/F—each arch is associated with a specific cranial nerve but all the structures arising from that arch do not receive innervation from that CN

A

FALSE! All structures DO receive innervation from that CN

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11
Q

What CN innervate what arches

A

PA 1- trigeminal (CN V)
PA 2- facial (CN VII)
PA 3- glossopharyngeal (CN IX)
PA 4/6- vagus (CN X)

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12
Q

What fibers are carried to skeletal muscle by CNs in each arch

A

motor (SVE)

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13
Q

What fibers are carried to regions of mucosa from the CNs associated with each arch

A

General sensory (GSA)—pain, temp, touch

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14
Q

What fibers do CN VII, IX, and X carry

A

Parasympathetic fibers of ANS (GVE). Autonomic neurons control glandular secretion

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15
Q

What CNs carry fibers for taste (SVA)

A

CN VII, IX, X

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16
Q

SVE

A

Special visceral afferent. Motor nerves supplying skeletal muscle.

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17
Q

GSA

A

General somatic afferent and this refers to pain, temp, touch, proprioception

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18
Q

GVE

A

General visceral efferent refers to autonomic innervation

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19
Q

SVA

A

Special visceral afferent refers to special sense fibers that transmit taste

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20
Q

T/F—the location of the mucosa or skin in the adult corresponds to where the PA was located

A

True

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21
Q

The pattern of _______ __________ of the mucosa reflects which PA fave rise to the mucosa

A

Sensory innervation

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22
Q

Skin will always be ______ derived

A

Ectoderm

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23
Q

Skin covers what areas of the head and is derived from what arch

A

Face, ear, external auditory meatus, and is ectoderm from PA 1

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24
Q

What gives sensory innervation to teh skin of the face

A

Trigeminal (v2, v3) which is the CN of PA 1

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25
Q

What does the V1 division of hte trigeminal nerve innervate

A

Derivatives of the frontonasal region

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26
Q

What region of mucosa is derived from PA 1

A

Oral cavity proper—ectoderm
Nasopharynx-endoderm

27
Q

What region of mucosa is derived from PA 2

A

Palatine tonsil which is the boundary b/w oral cavity and oropharynx

28
Q

What region of mucosa is derived from PA 3

A

Region of the oropharynx and posterior 1/3 of the tongue

29
Q

What region of mucosa is derived form PA 4

A

Region of the laryngopharynx/larynx which is the area from the epiglottis to the region above the vocal cords

30
Q

What region of mucosa is derived from PA 6

A

Region of the larynx—vocal cords and below

31
Q

What accessory structures are derived form PA

A

Tonsils (all 4), auditory tube, thymus, parathyroid, thyroid, external auditory meatus

32
Q

What germ layer will all structures of the pharynx be from

A

Endoderm

33
Q

Floor and roof derivatives __________________

A

Develop from endoderm in the midline of the tube. Adult structures may migrate to final position

34
Q

Pouch derivatives develop from ______________________

A

Walls of tube—adult structures that develop may migrate to final position

35
Q

What three things migrate to their final position

A

Thyroid epithelial cells, thymus epithelial reticular cells, parathyroid epithelial cells (chief/oxyphil)

36
Q

What is the developmental precursor for the ant 2/3 of the tongue and PA

A

Lateral lingual swellings
Floor of PA 1

37
Q

What is the developmental precursor and PA for tongue mucosa of post 1/3

A

Hypobranchial eminance
Floor of PA 3

38
Q

What is the developmental precursor and PA for the lingual tonsil mucosa

A

Hypobranchial eminence and floor of PA 3

39
Q

What is the developmental precursor and PA for the auditory tube

A

No precursor
PA 1 pouch

40
Q

What is the developmental precursor and PA for the palatine tonsil mucosa

A

No precursor
PA 2 pouch

41
Q

What is the developmental precursor and PA for pharyngeal tonsil mucosa

A

no precursor
PA 1 roof

42
Q

What is the developmental precursor and PA for

A
43
Q

What is the developmental precursor and PA for thyroid epithelial cells

A

Foramen cecum
Floor PA 2 btwn 1st and 3rd arch

44
Q

What is the developmental precursor and PA for thymus epithelial reticular cells

A

No precursor
PA 3 pouch

45
Q

What is the developmental precursor and PA for parathyroid epithelial cells

A

PA 3 and 4 pouch

46
Q

What is the developmental precursor and PA for epiglottis laryngeal mucosa and cartilage

A

Epiglottic swelling, aryepiglottic swelling
Floor region of PA4
Floor region of PA 6

47
Q

What are all floor/roof derivatives and pouch/ wall derivatives

A

Midline structures

Bilateral structures

48
Q

What is a developmental precursor

A

An intermediate structure that transiently develop that may disappear of give rise to adult structures

49
Q

Do all adult structures have developmental precursors

A

No

50
Q

____________ is the germ layer in each PA that gives rise to a specific group of muscles (in head)

A

Head mesoderm

51
Q

Does muscle migrate ?

A

Yes! So the final location of muscle may be diff than where its PA originated

52
Q

Muscle of PA 1

A

Muscles of mastication. Ant digastric, mylohyoid, tensor tympani, tensor veli palatini

53
Q

Muscles of PA 2

A

Muscles of facial expression, post digastric, stampedius, stylohyoid

54
Q

Muscles of PA 3

A

Stylopharyngeus

55
Q

Muscles of PA 4

A

Palatial, pharyngeal, or constrictors , adn cricothyroid m

56
Q

Muscles of PA 6

A

Laryngeal muscles—-vocalis, or arytenoid is part of name

57
Q

What muscles in the head do not come from head mesoderm and are not considered a muscle derivative of PA

A

Tongue muscles ! And they are innervated by CN XII which is not a PA nerve. They come from parasail mesoderm

58
Q

T/F—if the CN innervation to a muscle is not provided by V, VII,IX, Or X it can still be considered a PA derivative

A

FALSE! It CANNOT be a PA derivative if not innervated by one of the PA CN’s

59
Q

What germ layer gives rise to all CT, bone, and cartilage

A

Ectomesenchyme

60
Q

How do bones ossify vs cartilage

A

Bones- intramembranous
Cartilage- endochondral or stays as cartilage

61
Q

Cartilaginous precursors form what PA’s ossify to form bones

A

1,2,3

62
Q

Bones originating form __________ contribute to membranous viscerocranium

A

Frontonasal region

63
Q

Cartilaginous precursors of the PA which ossify contribut to waht

A

Facial skeleton. Many bones form PA 1,2,3 are also classified as [art of membranous viscerocranium

64
Q

List the PA’s and their associated bones, cartilage, CT of face and neck

A

PA1–facial skeleton (14 bones0
PA2/3–hyoid bone, stapes, styloid
PA4–epiglottis/thyroid cartilage
PA6–cricoid and laryngeal cartilages

Ethmoid Bulla aka Oral Histology Exam 2 (7 decks)

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