Throat Anatomy/Physiology

Question 1

Name the two parts of the oral cavity

Answer 1

Oral vestibule

Oral Cavity Proper

Question 2

What are the boundaries of the oral cavity?

Answer 2

Anterior-lips
Posterior-palatoglossal arch
Buccal mucosa of cheeks

Question 3

What is the nerve supply to the tongue?

Answer 3

Posterior 1/3 supplied by CN IX

Anterior 2/3- taste by chorda tympani (CN VII), sensation by lingual nerve (branch of CN V3)

Question 4

What are the borders of the oropharynx?

Answer 4

Lower border of soft palate to upper margin of epiglottis
Palatoglossal arch to posterior pharyngeal wall
Lateral: faucial pillars & palatine tonsils

Question 5

What is the nerve supply of the oropharynx?

Answer 5

Pharyngeal Plexus- CN IX and X

Question 6

What are three subsections of the hypopharynx?

Answer 6

Pyriform sinus
Post-cricoid area
Posterior pharyngeal wall

Question 7

What are the boundaries of the hypopharynx?

Answer 7

Superior margin of epiglottis to lower border of cricoid cartilage
Continuous with oesophagus
Anterior wall: back of larynx

Question 8

What is the motor nerve innervation of the larynx?

Answer 8

Intrinsic muscles supplied by recurrent laryngeal except for cricothyroid muscle supplied by external laryngeal nerve.

Question 9

What is the sensory innervation of the larynx?

Answer 9

Supraglottic: internal laryngeal nerve

Glottic and subglottic: recurrent laryngeal nerve