Week 15 — Readings & Resources · The Special Senses

Course: Anatomy & Physiology I (BIOL 2301 + BIOL 2101) · Silver Oak University (fictional sample) · Prof. Navarro
Objective covered: Objective 8 — Describe the special senses (vision, hearing & equilibrium, taste, and smell) and relate the structure of each sensory organ to its function.

How to use this page

Everything here is a link to an external resource — open it in your browser, the same way you'd open a YouTube link. Nothing needs to be downloaded.

This week's load is deliberately light: 1 video + 2 short readings + 1 interactive atlas, grouped by the ideas from the lecture. Watch or read one item per group and you're ready for the quiz; do all of them and you'll be very comfortable. Total time is roughly 35–45 minutes if you do everything, far less if you pick one per group.

Order that matches the lecture: ① the eye & vision (rods vs. cones, the light path) → ② the ear (hearing & equilibrium, the ossicles) → ③ taste & smell (the chemical senses).

A habit to start now: before you trust any A&P claim — in these resources, in a chatbot, or anywhere — ask the questions from class: Which receptor catches this stimulus? Is the structure→function pairing right (cornea refracts, lens focuses, retina detects)? Are rods and cones the right way round? Are the ossicles in order (malleus → incus → stapes)?

① The Eye & Vision

Maps to Lecture Segments 2–4. Light is bent, aimed, and caught: the cornea refracts, the lens focuses (accommodation), and the retina detects with rods (dim light, no color) and cones (bright light, color). The light path is cornea → pupil → lens → retina.

Video — "Vision: Crash Course Anatomy & Physiology" (CrashCourse A&P, the eye & vision episodes)
🔗 https://www.youtube.com/c/crashcourse
Why it earns the click: the CrashCourse Anatomy & Physiology series devotes whole episodes to the eye and to hearing/balance — energetic ~10-minute tours of exactly our week (how the eye refracts and focuses light, how rods and cones differ, and how the ear turns vibrations into sound). Open the channel's Anatomy & Physiology playlist and pick the eye/vision and hearing/equilibrium episodes. (If you want a guaranteed starting point, the verified series opener "Introduction to Anatomy & Physiology" is at 🔗 https://www.youtube.com/watch?v=uBGl2BujkPQ , with the senses episodes linked from the same playlist.)
⏱ ~10 min each

Reading — "Anatomy and Physiology 2e," §14.1 Sensory Perception (OpenStax)
🔗 https://openstax.org/books/anatomy-and-physiology-2e/pages/14-1-sensory-perception
Why it's assigned: the cleanest free, plain-language statement of how sensory receptors are organized — photoreceptors (vision), mechanoreceptors (hearing & balance), and chemoreceptors (taste & smell) — and how each special sense captures its stimulus and sends it to the brain. A free online textbook page, no account needed. (Use the "Next" links to step into the vision and hearing sections of the same chapter.)
⏱ ~12 min

② The Ear: Hearing & Equilibrium

Maps to Lecture Segments 5–6. Outer → middle → inner: the eardrum vibrates, the ossicles (malleus → incus → stapes) amplify, and the inner ear splits the work — the cochlea = hearing, the semicircular canals = balance.

Interactive — InnerBody "Nervous System & Sense Organs" (free, no download)
🔗 https://www.innerbody.com/image/nervov.html
Why it earns the click: a free, clickable atlas whose nervous-system overview covers the special senses and their receptors directly — including rods and cones in the retina and the role of the vestibulocochlear nerve in carrying hearing and balance. Use it in Lab 15 to confirm structure→function pairings; spend a few minutes now reading the "Sense Organs" and "Sensory Physiology" sections.
⏱ ~8 min (browse)

③ Taste & Smell: The Chemical Senses

Maps to Lecture Segment 7. Taste buds detect the five basic tastes (sweet, sour, salty, bitter, umami); olfactory receptors detect smell; both are chemoreceptors, and flavor is mostly smell — which is why a stuffy nose makes food taste bland.

Reading/Interactive — InnerBody "Eyes and Vision" (free atlas page)
🔗 https://www.innerbody.com/image/nerv09.html
Why it's assigned: a short, readable atlas page that nails the rods-vs-cones contrast in plain English — rods are sensitive enough for poor light but give only a coarse gray image, while cones give fine detail and color and need bright daylight, and both feed the optic nerve. Read it as your quick check that you have the most-reversed pair the right way round before the quiz. (For taste & smell, the OpenStax §14.1 chapter above continues into gustation and olfaction via its "Next" links.)
⏱ ~6 min

Optional one-stop references (free online)

• Khan Academy — Human Anatomy & Physiology. A free unit with short articles and videos covering the nervous system and the senses. A good place to return to all term.
  🔗 https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology
• GetBodySmart — interactive A&P tutorials. Clean, labeled, interactive diagrams; handy when you want to drill the eye's and ear's structures by name.
  🔗 https://www.getbodysmart.com/

Pick-one quick path (≈20 min total)

In a hurry? Do exactly these two and you'll be ready for the quiz:
1. Read OpenStax §14.1 "Sensory Perception" (receptor classes + how each sense captures its stimulus — the heart of the quiz).
2. Read InnerBody "Eyes and Vision" to lock in rods vs. cones (the most-reversed pair), then skim the InnerBody nervous-system "Sense Organs" section for the ear.

Heads-up (links rot): these point to outside sites that occasionally move or rename pages. If a link ever fails, tell Prof. Navarro and use the OpenStax or Khan Academy references above in the meantime.