Embryology Pharyngeal Cleft Derivatives Flashcards Preview

Neuro Mike Rose > Embryology Pharyngeal Cleft Derivatives > Flashcards

Flashcards in Embryology Pharyngeal Cleft Derivatives Deck (21):
1

CN of First Arch

Trigeminal

2

CN of Second Arch

Facial

3

CN of Third Arch

Glossopharyngeal

4

CN of Fourth Arch

Superior Laryngeal of Vagus

5

CN of Sixth Arch

Recurrent laryngeal branch of Vagus

6

Stenosis/Atresia

Ear Canal
Nasal Passage
Larynx
Esophagus
Trachea

7

Clefts

Ear pit
Nasal Masses
Face
Lip
Palate
Larynx
Tracheal-Esophageal

8

Persistent Structures

Thyroglossal duct
Branchial cleft

9

Skeletal Derivatives of the First Arch

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

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

10

Skeletal Derivatives of Second Arch

Stapes, styloid process, upper body of hyoid bone.

11

Skeletal Derivatives of Third Arch

Greater cornu and lower body of hyoid bone

12

Skeletal Derivatives of Fourth and Sixth Arch

Thyroid and Cricoid Cartilage.

13

First Pharyngeal Pouch Derivatives

Auditory Tube
Tympanic or middle ear cavity
Mastoid Air Cells

14

Second Pharyngeal Pouch Derivatives

Palantine tonsils

15

Third Pharyngeal Pouch Derivatives

Thymus
Inferior parathyroid glands

16

Fourth Pharyngeal Pouch Derivatives

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

17

1st membrane persists as

Tympanic Membrane

18

1st cleft forms

External Auditory Meatus

19

2nd, 3rd, and 4th Clefts form

Cervical sinus which normally disappears.

Lateral cervical (branchial) cyst or fistula when it persists

20

Thyroid embryology

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

Common branchial cysts

1st arch 8%

2nd arch is 90%