Simini Boards Cast
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✂️ Practical relevance for surgical application
🧠 Flashcard-style recaps + board-style questions
📈 Designed with resident + program director input
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Simini Boards Cast
Chapter 99 - Part B: The Nose Is Not Just an Airway: Physiology & Function
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In this BoardsCast episode, we continue Tobias Chapter 99 — Nasal Planum, Nasal Cavity, and Sinuses with the core reframe that changes how nasal disease makes sense:
The nose is not just an airway. It conditions, monitors, and protects every breath before it reaches the lungs.
If you bypass or destroy nasal function (intubation, obstruction, turbinate loss), you don’t just change airflow — you change the entire respiratory landscape. The lower airways inherit raw environmental air, which they were never designed to handle.
You’ll learn:
- Why dogs/cats are nasal breathers by default
- How turbinates force turbulent airflow to maximize mucosal contact
- The 4 core jobs: air conditioning, thermoregulation, olfaction, and immune defense
- Why panting is a thermoregulatory override when nasal cooling capacity is exceeded
- How olfaction works (sniffing redirects air to the ethmoidal region; GPCR → cAMP amplification)
- The immune triad: mucus trap + mucociliary escalator + IgA/antimicrobials
- What nasal failure does downstream: dry/cold air → thicker mucus → impaired cilia → lower airway inflammation/infection
This episode gives you the clinical lens: don’t just ask “is air moving?” — ask what the nose is failing to do.
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