Pharyngeal Arches

Question 1

Arch I Nerve

Answer 1

Trigeminal (CN V): sensory innervation for head and neck

Question 2

Arch I Cartilage

Answer 2

Meckel’s cartilage:

• Mandible grows around
• Malleus
• Incus

Question 3

Arch I Muscles

Answer 3

• Mastication: temporalis, masseter, medial/lateral pterygoids
• Anterior belly of digastic
• Tensor veli palatini
• Tensor tympani

Question 4

Arch I Arteries

Answer 4

• Maxillary a.

- External carotid a.

Question 5

Arch 1 Nickname

Answer 5

“Mandibular”

Question 6

Arch II Nerve

Answer 6

Facial (CN VII)

Question 7

Arch II Muscles

Answer 7

• Facial expression
• Posterior belly of digastric
• Stylohyoid

Question 8

Arch II Arteries

Answer 8

• Hyoid a.

- Stapedial (fetal) aa.

Question 9

Arch II Nickname

Answer 9

“Hyoid”

Question 10

Arch II Cartilage

Answer 10

Reichert’s cartilage:

• Stapes
• Hyoid (lesser horn & upper part of body)
• Styloid process
• Stylohyoid ligament

Question 11

Arch III Cartilage

Answer 11

• Greater cornu

- Inferior part of hyoid

Question 12

Arch III Nerve

Answer 12

Glossopharyngeal (CN IX)

Question 13

Arch III Muscle

Answer 13

Stylopharyngeus

Question 14

Arch III Arteries

Answer 14

• Common carotid a.

- Internal carotid a.

Question 15

Arches IV & VI Nerves

Answer 15

• Arch IV: Superior laryngeal n
• Arch VI: Recurrent laryngeal n.
• Both: Vagus (CN X)

Question 16

Arches IV & VI Muscles

Answer 16

• Cricothyroid
• Pharynx constrictors
• Larynx muscles
• Esophagus

Question 17

Arches IV & VI Arteries

Answer 17

• Arch IV: L-part of aortic arch, R-part of right subclavian a.
• Arch VI: L-part of left pulmonary a, R-part of right pulmonary a.

Question 18

Arches IV & VI Cartilages

Answer 18

Laryngeal