Pharyngeal arches and pouches

Question 1

what does each pharyngeal arch consist of

Answer 1

a core of mesenchymal tissue covered on the outside by

surface ectoderm and on the inside by epithelium of endodermal origin

Question 2

what does each pharyngeal arch receive a substantial number of?

Answer 2

neural crest cells which migrate into the arches to

contribute to skeletal components of the face.

Question 3

what does the musculature of the face and neck arise from

Answer 3

The original mesoderm of the pharyngealarches

Question 4

what does each muscular componant of the pharyngeal arch have one of its own

Answer 4

cranial nerve.

Question 5

true or false, Irrespective of where the pharyngeal arch

migrate they keep the same nerve component.

Answer 5

true

Question 6

true or false, each arch has its own arterial component

Answer 6

true

Question 7

Pharyngeal arch 1 Nerve

Answer 7

Trigeminal: maxillary and
mandibular branches (CN V)

Question 8

Pharyngeal arch 1 muscles

Answer 8

Mastication
Mylohyoid
Anterior belly of
digastric
Tensor palatine
Tensor tympani

Question 9

Pharyngeal arch 1 skeleton

Answer 9

Premaxilla
Maxilla
Zygomatic bone
Part of temporal bone
Meckel’s cartilage
Mandible malleus
Incus
Anterior ligament of
malleus
Sphenomandibular
ligament

Question 10

Pharyngeal arch 2 muscles

Answer 10

Facial expression
Posterior belly of
digastric
Stylohyoid
Stapedius

Question 11

Pharyngeal arch 2 nerve

Answer 11

Facial nerve (CN VII)

Question 12

Pharyngeal arch 2 skeleton

Answer 12

Stapes
Styloid process
Stylohyoid ligament
Lesser horn and upper
portion of body of
hyoid bone

Question 13

Pharyngeal arch 3muscles

Answer 13

stylopharyngeus

Question 14

Pharyngeal arch 3 nerve

Answer 14

Glossopharyngeal nerve (CN

IX)

Question 15

Pharyngeal arch 3 skeleton

Answer 15

Greater horn and
lower portion of body
of hyoid bone

Question 16

Pharyngeal arch 4-6muscles

Answer 16

Cricothyroid
Levator palatine
Constrictors of
pharynx
Intrinsic muscles of
larynx

Question 17

Pharyngeal arch 4-6 nerve

Answer 17

Vagus nerve (CN X)
Superior laryngeal branch
for 4 th pharyngeal arch
Recurrent laryngeal branch
for 6 th pharyngeal arch

Question 18

Pharyngeal arch 4-6 skeletons

Answer 18

Laryngeal cartilages

Question 19

how many pairs of pharyngeal pouches does the human embryo have?

Answer 19

four pairs of pharyngeal pouches the fifth of which is rudimentary.

Question 20

derivitives of the 1st pharyngeal pouch

Answer 20

Tympanic cavity (middle ear)
Auditory tube (eustachian)

Question 21

derivitives of the 2nd pharyngeal pouch

Answer 21

Palatine tonsils

Tonsillar fossa

Question 22

derivitives of the 3rd pharyngeal pouch

Answer 22

Inferior parathyroid gland

Thymus

Question 23

derivitives of the 4th pharyngeal pouch

Answer 23

Superior parathyroid gland ultimobranchial body (parafollicular cells of the thyroid gland.