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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
What does the V1 division of hte trigeminal nerve innervate
Derivatives of the frontonasal region
26
What region of mucosa is derived from PA 1
Oral cavity proper—ectoderm Nasopharynx-endoderm
27
What region of mucosa is derived from PA 2
Palatine tonsil which is the boundary b/w oral cavity and oropharynx
28
What region of mucosa is derived from PA 3
Region of the oropharynx and posterior 1/3 of the tongue
29
What region of mucosa is derived form PA 4
Region of the laryngopharynx/larynx which is the area from the epiglottis to the region above the vocal cords
30
What region of mucosa is derived from PA 6
Region of the larynx—vocal cords and below
31
What accessory structures are derived form PA
Tonsils (all 4), auditory tube, thymus, parathyroid, thyroid, external auditory meatus
32
What germ layer will all structures of the pharynx be from
Endoderm
33
Floor and roof derivatives __________________
Develop from endoderm in the midline of the tube. Adult structures may migrate to final position
34
Pouch derivatives develop from ______________________
Walls of tube—adult structures that develop may migrate to final position
35
What three things migrate to their final position
Thyroid epithelial cells, thymus epithelial reticular cells, parathyroid epithelial cells (chief/oxyphil)
36
What is the developmental precursor for the ant 2/3 of the tongue and PA
Lateral lingual swellings Floor of PA 1
37
What is the developmental precursor and PA for tongue mucosa of post 1/3
Hypobranchial eminance Floor of PA 3
38
What is the developmental precursor and PA for the lingual tonsil mucosa
Hypobranchial eminence and floor of PA 3
39
What is the developmental precursor and PA for the auditory tube
No precursor PA 1 pouch
40
What is the developmental precursor and PA for the palatine tonsil mucosa
No precursor PA 2 pouch
41
What is the developmental precursor and PA for pharyngeal tonsil mucosa
no precursor PA 1 roof
42
What is the developmental precursor and PA for
43
What is the developmental precursor and PA for thyroid epithelial cells
Foramen cecum Floor PA 2 btwn 1st and 3rd arch
44
What is the developmental precursor and PA for thymus epithelial reticular cells
No precursor PA 3 pouch
45
What is the developmental precursor and PA for parathyroid epithelial cells
PA 3 and 4 pouch
46
What is the developmental precursor and PA for epiglottis laryngeal mucosa and cartilage
Epiglottic swelling, aryepiglottic swelling Floor region of PA4 Floor region of PA 6
47
What are all floor/roof derivatives and pouch/ wall derivatives
Midline structures Bilateral structures
48
What is a developmental precursor
An intermediate structure that transiently develop that may disappear of give rise to adult structures
49
Do all adult structures have developmental precursors
No
50
____________ is the germ layer in each PA that gives rise to a specific group of muscles (in head)
Head mesoderm
51
Does muscle migrate ?
Yes! So the final location of muscle may be diff than where its PA originated
52
Muscle of PA 1
Muscles of mastication. Ant digastric, mylohyoid, tensor tympani, tensor veli palatini
53
Muscles of PA 2
Muscles of facial expression, post digastric, stampedius, stylohyoid
54
Muscles of PA 3
Stylopharyngeus
55
Muscles of PA 4
Palatial, pharyngeal, or constrictors , adn cricothyroid m
56
Muscles of PA 6
Laryngeal muscles—-vocalis, or arytenoid is part of name
57
What muscles in the head do not come from head mesoderm and are not considered a muscle derivative of PA
Tongue muscles ! And they are innervated by CN XII which is not a PA nerve. They come from parasail mesoderm
58
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
FALSE! It CANNOT be a PA derivative if not innervated by one of the PA CN’s
59
What germ layer gives rise to all CT, bone, and cartilage
Ectomesenchyme
60
How do bones ossify vs cartilage
Bones- intramembranous Cartilage- endochondral or stays as cartilage
61
Cartilaginous precursors form what PA’s ossify to form bones
1,2,3
62
Bones originating form __________ contribute to membranous viscerocranium
Frontonasal region
63
Cartilaginous precursors of the PA which ossify contribut to waht
Facial skeleton. Many bones form PA 1,2,3 are also classified as [art of membranous viscerocranium
64
List the PA’s and their associated bones, cartilage, CT of face and neck
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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