02 - Overview Of Development Of The Head & Neck Flashcards Preview

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Flashcards in 02 - Overview Of Development Of The Head & Neck Deck (28):
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What tissue forms the primitive pharynx?

The cranial gut tube

1

What are the pharyngeal arches?

What are they associated with?

How many are there?

A system of mesenchymal proliferations in the neck region of the embryo

An artery, nerve and neural-crest derived cartilage bar 5 (1,2,3,4&6)

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What is meant by the pharyngeal apparatus?

The pharyngeal arches and the frontonasal prominence

3

Between the pharyngeal arches, there are grooves.

What do they form?

On the outside they are lined by ectoderm and form pharyngeal clefts

On the inside they are lined by endoderm and form pharyngeal pouches

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What are the muscle derivatives of the first pharyngeal arch?

Muscles of mastication

Digastric

Mylohyoid

5

What are the muscle derivatives of the second pharyngeal arch?

Muscles of facial expression and stapedius 

6

What are the muscle derivatives of the third pharyngeal arch?

Stylopharyngeus

7

What are the muscle derivatives of the fourth pharyngeal arch?

Cricothyroid

Levator palatine

Constrictors of the pharynx

8

What are the muscle derivatives of the sixth pharyngeal arch?

Intrinsic muscles of the larynx

9

What is the nerve association for the first pharyngeal arch?

What are the motor and sensory functions?

Trigeminal (CN V)

Sensory: skin and lining of the nose and mouth

Motor: mastication and muscles from the mandibular process

10

What is the nerve association for the second pharyngeal arch?

What are the motor and sensory functions?

Facial (CN VIII)

Sensory: taste buds on the anterior 2/3 of the tongue

Motor: facial expression and stapedius

11

What is the nerve association for the third pharyngeal arch?

What are the motor and sensory functions?

Glossopharnygeal (CN IX)

Motor: stylopharyngeus

Sensory: posterior 1/3 of the tongue

12

What is the nerve association for the fourth pharyngeal arch?

Vagus (CN X) Branch = superior laryngeal

13

What is the nerve association of the sixth pharyngeal arch?

Vagus (CN X) Branch = recurrent laryngeal

14

What is the cartilage associated with the first pharyngeal arch?

Meckel's

It divides in to maxillary and mandibular prominence

The mandibular prominence from, the malieus, incus and template for the mandible, which will form by intramembranous ossification

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What is the cartilage associated with the second pharyngeal arch?

Reichert's

It forms the stapes of the middle ear, styloid process, lesser corny and upper body of the hyoid

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16

What is the cartilage associated with the third pharyngeal arch?

Remainder of the hyoid bone

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17

What is the cartilage associated with the fourth and sixth pharyngeal arches?

Thyroid, arytenoid, and cricoid

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What happens to the arteries associated with the first and second pharyngeal arches?

They regress

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What happens to the artery associated with the third pharyngeal arch?

Internal carotid

20

What happens to the artery associated with the fourth pharyngeal arch?

Left hand side - arch of the aorta

Right hand side - brachiocephalic trunk

21

What happens to the artery associated with the sixth pharyngeal arch?

Pulmonary arch

22

What happens to the first pharyngeal pouch?

It becomes the Eustachian tube and the Middle ear cavity

23

What happens to the second pharyngeal pouch?

Crypts of the palatine tonsil

24

What happens to the third pharyngeal pouch?

Dorsal part- inferior parathyroid

Ventral part- thymus

25

What happens to the fourth pharyngeal pouch?

Dorsal part - superior parathyroid

Ventral part - c cells of the thyroid

26

What happens to the pharyngeal clefts?

The first is maintained.

The second arch grows down to cover the other clefts to create a space (cervical sinus) and the other clefts are then obliterated

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What happens if the pharyngeal clefts aren't obliterated?

Branchial cysts and fistulae remain.

They can occur anywhere along the anterior border of the SCM