Human Pharyngeal Arch Derivatives

Question 1

First Arch

Answer 1

Mandibular:
Skeletal - beginnings of mandible, lmalleus, incus
Muscles - Muscles of mastication
Nerve - Cranial nerve V, trigeminal nerve

Question 2

Second Arch

Answer 2

Hyoid:
Skeletal - Stapes, styloid process, upper hyoid bone
Muscles - muscles of facial expression
Nerve - Cranial nerve VII, facial nerve

Question 3

Third Arch

Answer 3

Skeletal - Lower part of hyoid
Muscles - stylopharyngeus
Nerve - Cranial nerve IX, glossopharyngeal nerve

Question 4

Fourth Arch

Answer 4

Skeletal - cartilages of larynx
Muscles - muscles of pharynx and palate
Nerve - Cranial nerve X - vagus nerve

Question 5

Sixth Arch

Answer 5

First Occipital Somite
Skeletal - Cartilages of larynx
Muscles - Muscles of larynx
Nerve - Cranial nerve X - vagus nerve

Question 6

Lateral Mesoderm of Head

Answer 6

Trapezius and sternocleidomastoid