**Branchial arch derivatives

Question 1

1st arch

Answer 1

Cartilage
Maxillary process
Mandibular process
Malleus and incus
sphenoMandibular ligament

Muscles
Muscles of Mastication

Nerves
CN V2 and V3 (chew)

Question 2

2nd arch

Answer 2

Cartilage
Reichert cartilage: Stapes, Styloid process, lesser horn
of hyoid, Stylohyoid ligament

Muscles
Muscles of facial expression,
Stapedius, Stylohyoid,
platySma, posterior belly
of digastric

Nerves
CN VII (facial expression) (smile)

Question 3

3rd arch

Answer 3

Cartilage
Greater horn of hyoid

Muscles
*Stylopharyngeus (think of stylopharyngeus innervated by glossopharyngeal nerve)

Nerves
CN IX (stylopharyngeus)
(swallow stylishly)

Question 4

4th–6th arches

Answer 4

Cartilage
Arytenoids, Cricoid, Corniculate, Cuneiform, Thyroid (used to sing and
ACCCT)

Muscles
4th arch: most pharyngeal
constrictors; cricothyroid,
levator veli palatini

6th arch: all intrinsic muscles of larynx except cricothyroid

Nerves
4th arch: CN X (superior laryngeal branch) (simply swallow)
6th arch: CN X (recurrent
laryngeal branch) (speak)

Arches 3 and 4 form posterior 1⁄3 of tongue

arch 5 makes no major developmental contributions

“When at the restaurant of the golden *arches, children tend to first *chew (1), then *smile (2), then *swallow stylishly (3) or *simply swallow (4), and then *speak (6).