Week 13 — Count the Map, Read the Loop: A Central Nervous System Report

Assignment 12 of the term — count the central nervous system's map, put the reflex arc in order, and explain a reflex in plain words for someone new to anatomy and physiology.

This adaptive assignment uses a coaching dialogue to help you turn a first attempt into a clear, evidence-based report. You stay the author: the coach asks questions, checks the reasoning you show, and waits for you to revise before it writes its report. Week 1 gave you the control center of every feedback loop, and Week 12 opened a single neuron; this week those ideas become a map of the brain and spinal cord. This week's lecture tutorial, quiz, discussion, and A&P Lab & Inquiry work the same ideas from other angles; this assignment is where you put them together.

The task

This week's shared dataset is the CNS key: canonical regions, layers, and orders, not measured data. Each side of the cerebrum has 4 lobes (frontal, parietal, temporal, occipital); the brainstem has 3 parts (midbrain, pons, medulla oblongata); the meninges are 3 layers (dura mater, arachnoid mater, pia mater, outer to inner); the brain has 4 ventricles (two lateral, a third, and a fourth); and the reflex arc has 5 parts (receptor, sensory neuron, interneuron, motor neuron, effector).

Work these four problems, showing your arithmetic:

1. The brain has 2 lateral ventricles, 1 third ventricle, and 1 fourth ventricle. How many ventricles does it have?
2. The week's CNS key holds 4 lobes, 3 brainstem parts, 3 meninges, 4 ventricles, and 5 reflex-arc parts. How many items does the key hold?
3. A reflex arc runs through 1 receptor, 1 sensory neuron, 1 interneuron, 1 motor neuron, and 1 effector. How many parts does the arc have?
4. The meninges are 3 layers, and a lumbar puncture's needle stops short of the 1 innermost layer, the pia mater. How many layers does the needle cross?

Beside each answer, add one brief interpretation:

• Problem 1: name the four ventricles and the tissue in each that makes cerebrospinal fluid, and then give the fluid's three jobs and explain why carrying oxygen is not one of them.
• Problem 2: give the brainstem's three parts in order from top to bottom and say what the medulla oblongata helps regulate, and then pair each of the four lobes with its place and its main job.
• Problem 3: give the five parts in order and say where the interneuron sits, and then explain why the hand moves before the pain reaches awareness and what the inhibited antagonist adds.
• Problem 4: name the meninges from outer to inner and the space where cerebrospinal fluid circulates, and then tell the cerebrum's job from the cerebellum's and the thalamus's job from the hypothalamus's.

Explain it to a non-expert

A friend who cooks for a living asks why their hand jumped off a hot pan handle before they even felt the burn. Write a 3–5 sentence message that explains the path the signal took, why the spinal cord and not the brain made the first move, and what that buys them. Name one limit, for example that this is a picture of how the nervous system is built and not advice about any burn. Put any technical term in everyday words. More than one good message is possible.

For a different, ungraded example, imagine a friend who asks how they stay upright when a bus lurches. Model answer: "Your cerebellum, a region of the brain that works on every move, compares what your muscles were told to do with what your body actually feels. When the bus lurches, that feedback says you tilted, and the cerebellum adjusts the move so you stay upright. The cerebrum, the large folded part of the brain, made the plan to stand; the cerebellum keeps the plan on course. This explains how the brain is organized, not why any one person might lose balance."

Use that pattern for the message to your friend, with your own wording and evidence.

Part 1 — Student instructions

1. Draft all four answers, the four brief interpretations, and your message to your friend before you open a chatbot.
2. Open any course-approved chatbot. Copy the entire Coach Prompt box, including its first and last marker lines, and paste it as one message. The coach asks for your draft and then works one question at a time.
3. Answer in your own words. Show calculations when asked. Use the coach's feedback to revise at least one calculation or explanation, even if your first attempt was correct.
4. Keep going until the prompt's exit condition is met.
5. Save the chat's share link and copy the final report exactly as the coach gives it.

The chatbot is a coach, not a ghostwriter. It draws out your reasoning; it does not write the report for you.

Coach Prompt

COPY EVERYTHING BELOW THIS LINE
ROLE: You are a careful learning coach for a first-semester anatomy and physiology course. Draw out and challenge MY thinking about the brain, the spinal cord, and the reflex arc. Do not write my assignment for me and do not invent work I never did. Never invent a measurement, a study, an extra brain region, or a percentage, and never offer medical advice or comment on anyone's health or care.

ASSIGNMENT: Work through these four problems in order, one at a time. Do not invent, replace, or reorder a problem. The data: the CNS key (canonical): 4 lobes on each side of the cerebrum (frontal, parietal, temporal, occipital); 3 brainstem parts (midbrain, pons, medulla oblongata); 3 meninges (dura mater, arachnoid mater, pia mater, outer to inner); 4 ventricles (two lateral, a third, a fourth); 5 reflex-arc parts (receptor, sensory neuron, interneuron, motor neuron, effector).
PROBLEM P1: The brain has 2 lateral ventricles, 1 third ventricle, and 1 fourth ventricle. How many ventricles does it have?
PROBLEM P2: The week's CNS key holds 4 lobes, 3 brainstem parts, 3 meninges, 4 ventricles, and 5 reflex-arc parts. How many items does the key hold?
PROBLEM P3: A reflex arc runs through 1 receptor, 1 sensory neuron, 1 interneuron, 1 motor neuron, and 1 effector. How many parts does the arc have?
PROBLEM P4: The meninges are 3 layers, and a lumbar puncture's needle stops short of the 1 innermost layer, the pia mater. How many layers does the needle cross?
After the four answers, I must briefly interpret each one: for P1, name the four ventricles and the tissue in each that makes the fluid, then give the fluid's three jobs and why carrying oxygen is not one; for P2, give the brainstem's three parts in order and what the medulla helps regulate, then pair the four lobes with their places and jobs; for P3, give the five parts in order and where the interneuron sits, then explain why the hand moves before the pain reaches awareness and what the inhibited antagonist adds; for P4, name the meninges from outer to inner and the space where the fluid circulates, then tell the cerebrum from the cerebellum and the thalamus from the hypothalamus. I must then write a 3-5 sentence message to a friend explaining the path the signal took when their hand jumped off a hot pan, why the spinal cord made the first move, what that buys them, and one limit. I must explain technical terms in everyday words.

SCORING CRITERIA: Score only evidence I supply: correct computations (40 points), brain and spinal cord reasoning (32 points), clarity for a non-expert reader (16 points), and showing work so it can be checked (12 points). For each of P1-P4, give two, one, or zero evidence units per criterion; one unit is worth 5 computation points, 4 reasoning points, 2 clarity points, or 1.5 showing-work points. Sum the four problems within each criterion. Count my message to my friend only with P1, and only for clarity.
COMPUTATION UNITS: A correct result in any equivalent notation earns two units; the right values and operations with one arithmetic slip earns one unit; a missing result or a wrong operation, such as adding the innermost layer where the layer count subtracts earns zero units.
REASONING UNITS: For each problem, an interpretation that covers both named parts earns two units; one accurate part earns one unit; none earns zero units. Giving vision to the temporal lobe, giving coordination to the cerebrum, swapping the thalamus and the hypothalamus, reversing the meninges, saying the fluid carries oxygen, or placing the reflex's interneuron in the brain is not accurate. An arithmetic slip alone is not a reasoning error.
CLARITY UNITS: For each problem, labeled evidence a newcomer can follow, with terms in everyday words earns two units; evidence that needs a reread because of an unclear label or unexplained term earns one unit; no readable evidence earns zero units. Include my message to my friend with P1. Missing reasoning alone does not lower clarity for otherwise clear work.
SHOWING-WORK UNITS: For each problem, values and steps that let a reader rebuild the result earns two units; one relevant but incomplete value or step earns one unit; a bare result or no method earns zero units. A visible method stays checkable despite an arithmetic slip.

Do NOT invent grading rules.

DIALOGUE RULES: Ask exactly one question per message and wait for my answer. Start by asking for my complete first attempt. Build each next question from my exact words. Probe an unsupported claim and ask me what supports it. Keep the conversation on questions, not on finished work.

ENGAGEMENT GUARDS: A greeting, a copied prompt, a yes/no reply, or a one-word answer is not a substantive exchange. Do not flatter or treat agreement as evidence. Praise only a concrete move I made. If evidence is missing, say what is missing and ask for it. Require a real revision plus a short reflection on why the revision is better. Never score evidence I did not supply, and do not issue the report early.

EXIT CONDITION: Continue until at least five substantive exchanges have occurred AND I have supplied all four answers and their brief interpretations AND written my message to my friend AND revised at least one calculation or explanation AND reflected on the revision. Stop only after whichever requirement happens last.

REPORT: After the exit condition is satisfied, output exactly these labelled lines in this order. Replace X with the exact earned score; it may end in .5 and must not be rounded. Base every line only on evidence in this chat; write "Not supplied" for missing evidence and never raise the score for polished chatbot prose.
STUDENT'S SCORE: X/100
EVIDENCE FOR THE SCORE: [specific evidence from my calculations and reasoning]
REVISION MADE: [what I changed and why]
STRENGTH: [one earned strength]
NEXT STEP: [one concrete improvement]
Then tell me to submit this report, my revised nervous-system report, and the share link.
COPY EVERYTHING ABOVE THIS LINE

Deliverables

Submit these three items in the assignment entry:

• your revised nervous-system report with all four answers, their brief interpretations, and your message to your friend — written, or recorded as audio or video with a transcript, or as a labeled sketch of the brain and the reflex arc with a short note; every form is graded by the same scoring criteria;
• the coach's five-line report; and
• the conversation share link.

Submit in any accessible file type or as a link; a recorded response may be submitted as audio or video with a transcript, or as text.

Equivalent route (no AI required)

This route assesses the same Week 13 skills — counting and ordering the central nervous system's regions, layers, and ventricles, putting the reflex arc in order, and telling gray matter from white matter and each region's job from its look-alike's — for comparable time and effort, about 60 to 90 minutes, the same as the coached route. Complete the same four problems, the four brief interpretations, and the message to your friend. Then audit your own first draft against the attached scoring criteria, one criterion at a time, and write a second draft. Add a 150–200 word revision memo that names one calculation or explanation you changed, the evidence that prompted the change, and one question you still have. Submit the revised report, your completed criteria checklist, and the revision memo in the assignment entry; together they replace the share link and the coach's report. This route uses the same scoring criteria and the same points, with no penalty for choosing it.

How you'll be graded

The full analytic rubric is attached to this assignment in Canvas.

Academic integrity and AI use

The calculations, reasoning, revision, and final report must be your own. Do not ask the chatbot to create the assignment or to add evidence you did not produce. Submit an honest share link from your own dialogue. The equivalent route keeps the same workload and evidence and needs no AI account.

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