Week 15 — The Special Senses
Why this matters
A future optometric technician explaining why a dark room turns the world gray and a cook wondering why a dish tastes flat during a cold both lean on this week's sense organs.
In plain language
This week you follow the outside world into your body, one sense at a time. Every sense organ does two jobs: it captures something from outside, such as light or sound, and it converts that into a nerve signal your brain can read. The cells that do the converting are sensory receptors (cells or nerve endings that respond to one kind of stimulus, such as light, sound, or a chemical). You will trace light through the eye, sound and head motion through the ear, and chemicals through the tongue and nose, always in order. By the end, a dark room, a spinning chair, and a soup that tastes flat during a cold will each read as a short story about one structure doing its job.
- Already covered: Week 12 turned a stimulus into an action potential. Week 13 placed vision and hearing in the brain. Week 14 named the cranial nerves.
- This week: the five receptor classes, the eye, the ear, taste, and smell.
- How they connect: each sense organ captures a stimulus and converts it into the nerve signal you met in Week 12.
Focus
How does each sense organ capture its stimulus and turn it into a signal the brain can read?
By the end of this module, you should be able to:
- [ ] sort a stimulus into its receptor class
- [ ] follow light from the cornea to the retina and tell rods from cones
- [ ] follow sound from the eardrum through the ossicles to the cochlea
- [ ] explain why flavor is mostly smell
To-do
Plan your week
- Read Chapter 15 (about 45 minutes), then the lecture and slides.
- Work the tutorial (60–90 minutes) and practice set (20 minutes).
- Do the A&P Lab & Inquiry (two hours), the discussion, and the assignment.
- Take the quiz.
This week's checkpoint: put the light path and the three ossicles in order, then say which structure converts each stimulus.
You've got this
This is the last teaching week. Ask your instructor early if you get stuck.
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