Bony land marks of pharynx and larynx

Question 1

1st arch derivatives?

Answer 1

Jaws (including malleus and incus) all supplied by CN V

Question 2

2nd arch derivatives?

Answer 2

All supplied by CN VII

• Stapes
• styloid process (Spike paralleling ramus of the jaw)
• stylohyoid ligament (connects styloid to hyoid)
• Lesser horn of hyoid (Erect by pull of ligament)

Question 3

3rd arch derivatives?

Answer 3

All supplied by CN IX

• Greater horn of hyoid
• the body of hyoid

Question 4

4th arch derivative:

Answer 4

All supplied by CNX

• Thyroid cartilage
• -Attachment site for vocal cords
• -protect laryngopharynx

Question 5

6th arch derivatives:

Answer 5

All supplied by CNX

• arytenoid cartilage (attachment of vocal cords)
• cricoid cartilage and tracheal rings ( Form skeleton of the trachea)

Question 6

What are the pharyngeal attachments on the skull?

Answer 6

• Scaphoid fossa
• -posterior between medial and lateral pterygoid plates on base of skull
• -attachment site for tensor palati
• Hook of hamulus: Tensor palati “Hooks” around this process on the medial pterygoid plate to tense soft palate.
• Pharyngeal tubercule: in midline, just anterior to foramen magnum
• -marks posterior/ superior boundary of pharynx and its an attachment site for superior constrictor