Branchial Arch Derivatives

Question 0

2nd arch

Answer 0

Reichert Cartilage: Stapes, Styloid, Lesser horn of hyoid, stylohyoid ligament
Muscles of facial expression: stapedius, stylohyoid, platysma, posterior belly of digastric
CN VII

Question 1

1st arch

Answer 1

Meckel cartilage: mandible, malleus, Mandibular ligament
Muscles of mastication: temporalis, masseter, lateral and medial pterygoid
Mylohyoid
Anterior belly of digastric, tensor tympani, tensor Veli Palatini
Nerves: CN V2 and V3

Question 2

3rd arch

Answer 2

Cartilage: greater horn of hyoid
Muscles: Stylopharyngeus
Nerve: CN IX

Question 3

4th-6th arches

Answer 3

Cartilage: thyroid, cricoid, arytenoids, corniculate, cuneiform
4th arch muscles: most pharyngeal constrictors; cricothyroid, levator Veli palatini
4th arch nerves: CN X (superior laryngeal branch)
6th arch: all intrinsic muscles of larynx except cricothyroid
6th arch nerves: CN X (recurrent laryngeal branch)