Question: What topical anesthetic is frequently applied intranasally and works by reversibly binding to and inactivating sodium channels, inhibiting excitation of nerve endings, and causing vasoconstriction?

[Answer will be posted with next week's new question]

Answer to last week's question, A Sticky Situation (Feb 16, 2015):

Ossicular fixation. Malleus head fixation can be congenital or acquired and may be seen in nonsclerotic ears.