Embryo exam 2

Question 1

Pharyngeal arch 1 derivatives

Answer 1

Arteries: Maxillary a.

Mm: mm. of mastication, mylohyoid, anterior digastric, tensor tympani, tensor veli palatini

Nerves: V3

Clefts: External acoustic meatus

Pouches: tubotympanic recess, middle ear cavity, auditory tube

Question 2

Pharyngeal arch 2 derivatives

Answer 2

Arteries: hyoid a., stapedial a.

Mm: mm. of facial expression, posterior digastric m, stapedius m, stylohyoid m.

Nerves: CN VII

Pouches: palatine tonsil

Question 3

Pharyngeal arch 3 derivatives

Answer 3

Arteries: carotid a., root of internal carotid a.

Mm: stylopharyngeus m.

Nerves: CN IX

Pouches: Thymus and inferior parathyroids

Question 4

Pharyngeal arch 4/6 derivatives

Answer 4

Arteries: arch of aorta, R subclavian, sprouts of pulmonaries, ductus arteriosus

Mm: pharyngeal constrictors, cricothyroid, levator veli palatini, intrinsic mm. of larynx

Nerves: CN X

Pouches: superior parathyroids

Question 5

Superior parathyroids and inferior parathyroids are derivatives of what pharyngeal archs

Answer 5

INFERIOR = arch 3

SUPERIOR = arch 4/6