Embryology 1

Question 1

When do the pharyngeal arches develop?

Answer 1

Week 4 and 5

Question 2

Core of mesenchyme derived from paraxial and lateral plate mesoderm

Answer 2

Musculature of face

Question 3

Neural crest cells form what?

Answer 3

Skeletal components of face

Question 4

Nerve from arch 4

Answer 4

Superior laryngeal branch of vagus nerve

Question 5

Nerve from arch 6

Answer 5

Recurrent laryngeal branch of vagus nerve

Question 6

Skeletal components of the first arch

Answer 6

Maxillary process (dorsal portion)
Mandibular process (ventral portion)

Question 7

Arch 3

Answer 7

Glossopharyngeal nerve

Question 8

Arch 2

Answer 8

Facial nerve

Question 9

Arch 1

Answer 9

Trigeminal nerve (maxillary and mandibular divisons)

Question 10

Glossopharyngeal nerve

Answer 10

Arch 3

Question 11

Facial nerve

Answer 11

Arch 2

Question 12

Trigeminal nerve

Answer 12

Arch 1

Question 13

Superior laryngeal nerve

Answer 13

Arch 4

Question 14

Recurrent laryngeal nerve

Answer 14

Arch 6

Question 15

Contains maxilla, zygomatic and part of temporal bone

Answer 15

Maxillary process (dorsal portion) of 1st arch

Question 16

Contains Meckel’s cartilage, incus, malleus and mandible

Answer 16

Mandibular process (ventral portion) of 1st arch

Question 17

Muscles of mastication

Answer 17

Arch 1

Question 18

Mylohyoid

Answer 18

Arch 1

Question 19

Stapes, styloid process of temporal bone and stylohyoid ligament

Answer 19

Arch 2

Question 20

Muscles of facial expression

Answer 20

Arch 2

Question 21

Muscles of arch 3

Answer 21

Stylopharyngeus

Question 22

Cricothyroid, levator palatini and pharyngeal constrictors

Supplied by superior laryngeal nerve (X)

Answer 22

Arch 4

Question 23

Intrinsic laryngeal mm.

Supplied by recurrent laryngeal nerve (X)

Answer 23

Arch 6

Question 24

Pouch 1

Answer 24

Middle ear
Eustachian tube
Tympanic membrane

Question 25

Pouch 2

Answer 25

Palatine tonsil

Question 26

Inferior parathyroid gland | Thymus

Answer 26

Pouch 3

Question 27

``` Superior parathyroid gland Ultimobranchial body (C cells of thyroid gland) ```

Answer 27

Pouch 4

Question 28

1st cleft

Answer 28

External auditory meatus

Question 29

What do otic vesicles give rise to?

Answer 29

The inner ear

Question 30

Urtricular portion of otic vesicle gives rise to what?

Answer 30

Semicircular canal

Question 31

Saccular portion of otic vesicle gives rise to what?

Answer 31

Cochlea