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Neuro Mike Rose > Embryology Pharyngeal Cleft Derivatives > Flashcards

Embryology Pharyngeal Cleft Derivatives Flashcards

1
Q

CN of First Arch

A

Trigeminal

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2
Q

CN of Second Arch

A

Facial

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3
Q

CN of Third Arch

A

Glossopharyngeal

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4
Q

CN of Fourth Arch

A

Superior Laryngeal of Vagus

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5
Q

CN of Sixth Arch

A

Recurrent laryngeal branch of Vagus

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6
Q

Stenosis/Atresia

A 
Ear Canal
Nasal Passage
Larynx
Esophagus
Trachea
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7
Q

Clefts

A 
Ear pit
Nasal Masses
Face
Lip
Palate
Larynx
Tracheal-Esophageal
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8
Q

Persistent Structures

A

Thyroglossal duct

Branchial cleft

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9
Q

Skeletal Derivatives of the First Arch

A

Maxillary prominence: Maxilla, Zygomatic, Squamous part of temporal bone.

Mandibular prominence: Merkel’s cartilage (Mandible), Reichert’s cartilage (Inner ear); malleus, incus

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10
Q

Skeletal Derivatives of Second Arch

A

Stapes, styloid process, upper body of hyoid bone.

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11
Q

Skeletal Derivatives of Third Arch

A

Greater cornu and lower body of hyoid bone

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12
Q

Skeletal Derivatives of Fourth and Sixth Arch

A

Thyroid and Cricoid Cartilage.

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13
Q

First Pharyngeal Pouch Derivatives

A

Auditory Tube
Tympanic or middle ear cavity
Mastoid Air Cells

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14
Q

Second Pharyngeal Pouch Derivatives

A

Palantine tonsils

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15
Q

Third Pharyngeal Pouch Derivatives

A

Thymus

Inferior parathyroid glands

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16
Q

Fourth Pharyngeal Pouch Derivatives

A 
Superior Parathyroid glands
Ultimobranchial bodies (aka parafollicular cells of thyroid)
17
Q

1st membrane persists as

A

Tympanic Membrane

18
Q

1st cleft forms

A

External Auditory Meatus

19
Q

2nd, 3rd, and 4th Clefts form

A

Cervical sinus which normally disappears.

Lateral cervical (branchial) cyst or fistula when it persists

20
Q

Thyroid embryology

A

Endodermal evagination from floor of pharynx between 1st and 2nd pouches forms the thyroid diverticulum which makes the follicular cells.

4th pharyngeal pouch makes the ultimaobranchial body which makes the parafollicular cells.

Follicula cells and parafollicular cells combine to make thyroid gland.

21
Q

Common branchial cysts

A

1st arch 8%

2nd arch is 90%

Neuro Mike Rose (21 decks)

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