Embryology - Pharyngeal Arches and Ear Flashcards Preview

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Flashcards in Embryology - Pharyngeal Arches and Ear Deck (63)
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1

What do the pharyngeal arches give rise to?

Facial and neck structures

2

At which day does arch 1 geneally develop by?

22

3

How many arches are there?

5

(1,2,3,4 and 6 - 5 degenerates)

4

Each pharyngeal arch consists of which 4 parts?

  1. Core of mesenchyme (from paraxial/lateral plate of mesoderm)
  2. Neural crest cells
  3. Cranial nerve component
  4. Artery

5

What does the core of mesenchyme within the pharyngeal arches go on to develop into?

Musculature of face and neck

6

Neural crest cells within the pharyngeal arches go on to form what?

Skeletal components of the face

7

How are the pharyngeal pouches separated?

Pharyngeal clefts

8

What lines the pharyngeal arches?

Externally - Ectoderm

Internally - Endoderm

9

Which cranial nerve is associated with the first pharyngeal arch?

Trigeminal nerve

(Maxillary and mandibular divisions)

10

Which cranial nerve is associated with the 2nd pharyngeal arch?

Facial nerve

11

Which cranial nerve is associated with the 3rd pharyngeal arch?

Glossopharyngeal

12

Which cranial nerve is associated with the 4th pharyngeal arch?

Superior laryngeal branch of vagus

13

Which cranial nerve is associated with the 6th pharyngeal arch?

Recurrent laryngeal nerve of vagus nerve

14

Which two portions can the 1st pharyngeal arch be split?

  1. Dorsal (maxillary process)
  2. Ventral (mandibular process)

15

Which skeletal components will develop within the dorsal portion of the 1st pharyngeal arch?

  1. Maxilla
  2. Zygomatic process and part of temporal bone

16

Which skeletal components will develop within the ventral portion of the 1st pharyngeal arch?

Meckel's cartilage

(Incus, malleus and mandible develop)

17

Which muscles will develop within the 1st pharyngeal arch?

  1. Muscles of mastication
  2. Anterior belly of digastric
  3. Mylohyoid
  4. Tensor tympani
  5. Tensor palatini

18

The muscles which develop within the 1st pharyngeal arch are all innervated by which cranial nerve?

CN V3

19

Which muscle forms the floor of the mouth?

Mylohyoid

20

Which skeletal components arise from the 2nd pharyngeal arch?

  1. Stapes
  2. Styloid process of temporal bone and stylohyoid ligament
  3. Lesser horn and upper part of hyoid bone body

21

Which muscles will arise from pharyngeal arch 2?

  1. Muscles of facial expression
  2. Stapedius
  3. Stylohyoid
  4. Posterior belly of digastric
  5. Auricular muscles

22

The muscles which are dervived from the 2nd pharyngeal arch are all supplied by which cranial nerve?

CN VII

23

Which muscle(s) are dervived from the 3rd pharyngeal arch?

Stylopharyngeus

24

The muscle(s) derived from the 3rd pharyngeal arch are innervated by which cranial nerve?

CN IX

25

Which bony aspects are derived from the 3rd pharyngeal arch?

Greater horn and lower part of body of hyoid

26

What two main types of tissue do the 4th and 6th pharyngeal arches contribute?

  1. Cartilage
  2. Musculature

27

Which pharyngeal arches contribute to the laryngeal cartilages?

4 and 6

28

Which muscles does the 4th pharyngeal arch contribute?

  1. Cricothyroid constrictor
  2. Levator palatini constrictor
  3. Pharyngeal constrictor

29

Which muscle(s) are provided by the 6th pharyngeal arch?

Intrinsic laryngeal muscle

30

What does the first pharyngeal cleft give rise to?

External auditory meatus