Core Concepts and Principles Flashcards

A type B (flat) tympanogram with a normal ear canal volume most strongly suggests which condition?

Answer: Middle ear effusion

A flat trace with normal volume points to fluid behind an intact tympanic membrane.

A dip in bone conduction thresholds centered around 2000 Hz (Carhart notch) is characteristic of which condition?

Answer: Otosclerosis

The Carhart notch is a mechanical artifact of stapes fixation seen in otosclerosis.

Which nerve innervates the stapedius muscle?

Answer: Facial nerve

The nerve to stapedius branches off the mastoid segment of the facial nerve.

Where does the nasolacrimal duct open?

Answer: Inferior meatus

The nasolacrimal duct opens into the inferior meatus beneath the inferior turbinate, guarded by Hasner's valve.

The sphenopalatine artery, a common source of posterior epistaxis, is a terminal branch of which vessel?

Answer: Maxillary artery

The sphenopalatine artery is a terminal branch of the internal maxillary artery, which comes off the external carotid.

Which structure is NOT part of Waldeyer's ring?

Answer: Submandibular lymph nodes

Waldeyer's ring is made up of the pharyngeal, tubal, palatine, and lingual tonsils, not the cervical nodes.

What is the most common salivary gland neoplasm?

Answer: Pleomorphic adenoma

Pleomorphic adenoma is the most common salivary tumor and usually arises in the parotid.