Pharyngeal Arches

Question 1

1st pharyngeal arch neural derivatives

Answer 1

CNV3

Question 2

1st pharyngeal arch skeletal derivatives

Answer 2

maxilla, zygomatic bone, meckel’s cartilage, mandible, malleus, incus, squamous portion of temporal bone

Question 3

1st pharyngeal arch muscular derivatives

Answer 3

tensor tympani, tensor veli palatini, mylohyoid, muscles of mastication, anterior belly of digastric

Question 4

2nd pharyngeal arch neural derivative

Answer 4

CNVII

Question 5

2nd pharyngeal arch skeletal derivatives

Answer 5

stapes, styloid process of temporal bone, stylohyoid ligament, lesser horn of hyoid, upper part of hyoid body

Question 6

2nd pharyngeal arch muscular derivatives

Answer 6

muscles of facial expression, posterior belly of digastric, stapedius, stylohyoid, auricular muscles

Question 7

3rd pharyngeal arch neural derivative

Answer 7

CNIX

Question 8

3rd pharyngeal arch skeletal derivatives

Answer 8

greater horn of hyoid, lower part of hyoid body

Question 9

3rd pharyngeal arch muscular derivatives

Answer 9

stylopharyngeus

Question 10

4th pharyngeal arch neural derivative

Answer 10

CNX

Question 11

4th pharyngeal arch skeletal derivative

Answer 11

laryngeal cartilage

Question 12

4th pharyngeal arch muscular derivatives

Answer 12

levator veli palatini, salpingopharyngeus, palatoglossus, palatopharyngeus, all pharyngeal constrictors, cricothyroid

Question 13

6th pharyngeal arch neural derivative

Answer 13

CNX

Question 14

6th pharyngeal arch skeletal derivative

Answer 14

laryngeal cartilages

Question 15

6th pharyngeal arch muscular derivative

Answer 15

intrinsic muscles of the larynx

Question 16

1st pharyngeal pouch

Answer 16

tympanic membrane, inner ear, eustachian tube

Question 17

2nd pharyngeal pouch

Answer 17

palatine tonsil

Question 18

3rd pharyngeal pouch

Answer 18

inferior parathyroid gland, thymus

Question 19

4th pharyngeal pouch

Answer 19

superior parathyroid gland, thyroid gland

Question 20

5 facial swellings present at week 4

Answer 20

frontonasal prominence, 2x maxillary prominences, 2x mandibular prominences

Question 22

surrounding the primitive oral cavity

Answer 22

stomodeum

Question 23

ectodermal thickenings on frontonasal cavity

Answer 23

nasal placodes

Question 24

9 facial swellings present at week 5

Answer 24

frontonasal prominence, 2x maxillary prominences, 2x mandibular prominences, 2x medial nasal swellings, 2x lateral nasal swellings

Question 25

prominences that form the upper lip

Answer 25

2x medial nasal prominences, 2x maxillary prominences

Question 26

prominences that form the lower lip

Answer 26

2x mandibular prominences

Question 27

prominences that form the nose

Answer 27

frontonasal prominence, 2x medial nasal prominence, 2x lateral nasal prominences

Question 28

intermaxillary segment formed by...

Answer 28

fusion of 2 nasal prominences

Question 29

forming intermaxillary segment is connected by...

Answer 29

nasal fin

Question 30

nasal fin thins and opens...

Answer 30

nasal sac

Question 31

allow nasal cavity to communicate with oral cavity behind primary palate

Answer 31

primitive choanae

Question 32

open at junction of nasal cavity with pharynx due to formation of secondary palate

Answer 32

definitive choanae