2e. Pharyngeal Arch Components

Question 1

First arch (mandibular)

Identify:

(1) Nerve
(2) Muscles
(3) Skeletal structures
(4) Ligaments

Answer 1

1. Trigeminal n. (CN V)
2. M. of mastication, mylohyoid m., ant & post bellies of digastric m., tensor tympanic m, tensor veli palatini m.
3. Malleus & incus
4. Anterior l. of malleus & sphenomandibular l.

Question 2

Second arch (hyoid)

Identify:

(1) Nerve
(2) Muscles
(3) Skeletal structures
(4) Ligaments

Answer 2

1. Facial n. (CN VII)
2. M. of facial expression, stapedius m., stylohyoid m., posterior belly of digastric m.
3. Stapes, styloid process, lesser cornu of hyoid, upper part of body of hyoid bone
4. Stylohyoid l.

Question 3

Third

Identify:

(1) Nerve
(2) Muscles
(3) Skeletal structures

Answer 3

1. Glossopharyngeal (CN IX)
2. Stylopharyngeus m.
3. Greater cornu of hyoid & lower part of body of hyoid bone

Question 4

Fourth & Sixth

Identify:

(1) Nerve
(2) Muscles
(3) Skeletal structures

Answer 4

1. Superior laryngeal branch of vagus (CN X) and recurret laryngeal branch of vagus (CN X)
2. Cricothyroid m., levator veli palatini m., constrictors of pharynx m., intrinsic muscles of larynx m., striated m. of esophagus
3. Thyroid cartilage, cricoid cartilage, arytenoid cartilage, corniculate cartilage, and cuneiform cartilage