pharyngeal arches

Question 1

Pharyngeal arch 1

1. Innervation
2. Develops into..
   a) muscles
   b) bones/cartilage

Answer 1

1. Innervation: CN 5c - mandibular branch of the trigeminal nerve
2. Develops into..
   a) muscles: muscles of mastication, tensor tympani, digastric, mylohyoid
   b) bones: maxilla, mandible, incus, malleus

Question 2

Pharyngeal arch 2

1. Innervation
2. Develops into..
   a) muscles
   b) bones/cartilage

Answer 2

1. Innervation: CN 7, facial nerve
2. Develops into..
   a) muscles: muscles of facial expression, stapedius, stylohyoid
   b) bones: stapes, styloid, lesser horn of hyoid cartilage

Question 3

Pharyngeal arch 3

1. Innervation
2. Develops into..
   a) muscles
   b) bones/cartilage

Answer 3

1. Innervation: CN 9, Glossopharyngeal nerve
2. Develops into..
   a) muscles: stylopharyngeus of pharynx
   b) bones: lower body & greater horn of hyoid cartilage

Question 4

Pharyngeal arch 4

1. Innervation
2. Develops into..
   a) muscles
   b) bones/cartilage

Answer 4

1. Innervation: Vagus nerve, superior laryngeal branch
2. Develops into..
   a) muscles: cricothyroid
   b) bones: thyroid cartilage, epiglottic cartilage

Question 5

Pharyngeal arch 5

1. Innervation
2. Develops into..
   a) muscles
   b) bones/cartilage

Answer 5

NO pharyngeal arch 5!!!

It regresses soon after forming.

Question 6

Pharyngeal arch 6

1. Innervation
2. Develops into..
   a) muscles
   b) bones/cartilage

Answer 6

1. Innervation: vagus nerve, recurrent laryngeal branch
2. Develops into..
   a) muscles: all of larynx except cricothyroid
   b) bones: cricoid, arytenoid, corniculate and cuneiform artilage