Week 9 — A&P Lab / Scientific Inquiry · "Build the Skeleton, Name the Joints"

Course: Anatomy & Physiology I (BIOL 2301 + BIOL 2101) · Silver Oak University (fictional sample) · Prof. Navarro
Objective: Objective 4 — identify bones by region and division (axial/appendicular) and classify joints by type and movement · SLO A (relate structure to function) · SLO B (use skeletal terminology correctly)
Worth 50 points · Labs group = 15% of the grade · Lab 9
Format: a guided exploration of a free virtual skeleton (no download, nothing to buy) — you'll identify bones and joint types, describe what each joint does, and then catch the AI's mistakes when it labels the skeleton.

This is the course's signature weekly component. Every instructional week has one A&P lab. This week's uses a free virtual skeleton; you'll sort bones into the two divisions and classify the joints between them. All lab resources are links to external sites — nothing to buy or download.

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Part 1 — The Big Picture

This week you learned the skeleton's organization: the two divisions (axial core, appendicular limbs + girdles), the bones by region, and the three joint classes (fibrous, cartilaginous, synovial) with the synovial types and their movements. A clinician uses this map every time they read a film or chart a fracture. Today you'll use it on a real skeleton model — find bones, sort each into its division and region, and classify the joints, the way a precise chart entry would.

The scientific habit this builds: observation → classification against defined criteria → checking your classification against a reference. In A&P, "classification" is the skeletal language — and the lab is where it becomes automatic.

Background (optional, ~10 min): OpenStax A&P §9.1, "Classification of Joints" — keep it open as your answer key for the three structural classes (fibrous/cartilaginous/synovial) and the functional names: 🔗 https://openstax.org/books/anatomy-and-physiology-2e/pages/9-1-classification-of-joints

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Part 2 — Your Scientific Question & Hypothesis

Anatomy labs still start like any inquiry — with a question and a prediction you'll test against evidence (here, the virtual skeleton).

The question: Can you correctly sort any bone into its division and region, and classify any joint by its type and the movement it allows — and can an AI do the same without slipping?

Before you start, write your hypothesis / prediction:

I predict that for the bones and joints below, I can name the correct division (axial/appendicular), the correct region, and the correct joint type and movement — and that when I ask an AI to do the same, it will make at least ______ labeling error(s) I can catch (for example, swapping the radius and ulna, or calling a skull suture "synovial").

(There's no "right" number — you're predicting how reliable the AI will be, then checking.)

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Part 3 — Materials & Procedure

You need (all free, in a browser):
- The InnerBody Skeletal System Explorer (free, no download): 🔗 https://www.innerbody.com/image/skelfov.html
- Optional second reference: OpenStax §9.4 Synovial Joints: 🔗 https://openstax.org/books/anatomy-and-physiology-2e/pages/9-4-synovial-joints
- An approved chatbot (Gemini, Claude, or ChatGPT) for Part 6.

Procedure:
1. Open the Skeletal System Explorer and look over the whole skeleton, then zoom into the skull, the vertebral column, and the limbs so you can find the bones in the Part 4 table.
2. For each bone in the Part 4 table, record: (a) its division — axial or appendicular — and (b) its region (e.g., "vertebral column," "forearm," "thigh").
3. For each joint in the table, record its structural type (fibrous, cartilaginous, or synovial) and one movement it allows (or "none — immovable").
4. Keep OpenStax §9.1 / §9.4 open and check each of your own answers against it before moving on.

No specific atlas access? Any free virtual skeleton or 3D viewer works (e.g., GetBodySmart's skeletal-system tutorials: https://www.getbodysmart.com/skeletal-system). The skill — classify the bone and joint in standard terms and verify it — is identical.

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Part 4 — Structure-Identification Table (fill this in)

Bones — division & region:

Bone	Division (axial / appendicular)	Region
Femur	______	______
Sternum	______	______
Scapula	______	______
A lumbar vertebra	______	______
Radius	______	______ (and: thumb side or little-finger side?)
Tibia	______	______ (and: is this the weight-bearer, or the fibula?)

Joints — type & movement:

Joint	Structural type (fibrous / cartilaginous / synovial)	One movement it allows (or "none")
A skull suture (between two cranial bones)	______	______
The elbow	______	______
The hip	______	______
An intervertebral disc (between two vertebrae)	______	______

Use only standard terms — divisions: axial, appendicular; joint classes: fibrous, cartilaginous, synovial; movements: flexion/extension, abduction/adduction, rotation, circumduction (or "none — immovable").

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Part 5 — Identify the Reasoning

Answer in a sentence each:
1. What is the rule that lets you predict a joint's mobility from its structural class? Give one example (e.g., why is a skull suture immovable but the knee freely movable?).
2. The scapula and hip bones sit near the body's core, yet they're classified as appendicular. Why? (What makes a bone appendicular rather than axial?)
3. Pick one joint and explain how its structure serves its function — for example, why does the ball-and-socket shoulder have such a large range of motion, and what does it give up for that mobility? (This is the structure→function habit.)

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Part 6 — AI-Critique Moment (required — this is the BYOAI step)

Now bring in your approved chatbot (Gemini, Claude, or ChatGPT) and be the clinician who checks its chart.

1. Paste this to the chatbot: "Classify these bones as axial or appendicular and give each one's region: femur, sternum, scapula, radius, tibia. Then tell me which forearm bone is on the thumb side, and classify these joints (fibrous, cartilaginous, or synovial): a skull suture, the elbow, an intervertebral disc."
2. Check everything it says against the atlas and OpenStax §9.1 / §9.4:
   - Did it keep the scapula appendicular (a pectoral-girdle bone), not axial? Chatbots often misfile the girdle bones.
   - Did it put the radius on the thumb side (not the ulna)? This is the most common skeletal slip.
   - Did it call the skull suture fibrous and immovable — NOT synovial? A suture has no joint cavity.
   - Did it classify the intervertebral disc as cartilaginous (slightly movable), and the elbow as synovial (a hinge)?
   - Did it get the tibia as the large weight-bearing leg bone (not the fibula)?
3. Write 2–3 sentences reporting what the AI got right and at least one labeling error you caught and corrected (with the correct term). If it happened to get everything right, say how you verified each label against the atlas — that's the skill.

The habit all term: the tool drafts, you judge. A chatbot will confidently swap the radius and ulna or call a suture "synovial" — catching it is the point, and in the clinic it's not optional.

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Part 7 — What to Submit

Submit a single document (or text entry) with: your hypothesis/prediction, your completed Part 4 tables, your Part 5 answers, and your Part 6 AI-critique paragraph. Due Sunday, Nov 1, 11:59 p.m. (50 points).

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Instructor answer key — REMOVE BEFORE PUBLISHING TO STUDENTS

Every classification below is verified against standard anatomy (OpenStax A&P §8 intro; §9.1 Classification of Joints; §9.4 Synovial Joints; InnerBody skeletal).

Part 4 — verified bone table:

Bone	Division	Region
Femur	appendicular	thigh (lower limb)
Sternum	axial	thoracic cage (anterior chest)
Scapula	appendicular	pectoral (shoulder) girdle
A lumbar vertebra	axial	vertebral column (lower back)
Radius	appendicular	forearm — thumb (lateral) side
Tibia	appendicular	leg — the large weight-bearing bone (the fibula is the thin one beside it)

Part 4 — verified joint table:

Joint	Structural type	One movement (or "none")
A skull suture	fibrous	none — immovable (a synarthrosis)
The elbow	synovial (hinge)	flexion / extension
The hip	synovial (ball-and-socket)	flexion/extension, abduction/adduction, rotation, circumduction (any one)
An intervertebral disc	cartilaginous	slight movement (bending; an amphiarthrosis)

• Part 5: (1) The more rigid the connecting material, the less the joint moves: fibrous → immovable, cartilaginous → slightly movable, synovial → freely movable. A skull suture is fibrous tissue with no cavity, so it's immovable; the knee is synovial with a fluid-filled cavity, so it moves freely. (2) The scapula and hip bones are girdle bones — the pectoral and pelvic girdles anchor the limbs to the axial skeleton, so they belong to the appendicular division even though they sit near the core; what makes a bone appendicular is that it's part of a limb or the girdle that attaches one. (3) Example: the shoulder is a ball-and-socket joint with a shallow socket, so the rounded head of the humerus can move in all three planes — the greatest range of motion in the body — but it gives up stability for that reach (it relies on muscles and ligaments, not a deep bony socket), which is why it's the most-dislocated joint.
• Part 6 (AI-critique): full credit for a specific catch — most commonly the AI swapping the radius and ulna ("the ulna is on the thumb side" — wrong; it's the radius), calling the scapula axial (it's appendicular), or labeling a skull suture "synovial" (it's fibrous and immovable). Full credit also if the student verified each label against the atlas and OpenStax.

Grading rubric — 50 points

Criterion	Full	Partial	None
Hypothesis / prediction — a clear prediction about both the bones/joints and the AI's reliability (6)	6	3–4	0–2
Structure table (Part 4) — bones' divisions + regions and joints' types + movements correct (18)	18	9–15	0–7
Reasoning (Part 5) — the mobility rule, the appendicular-girdle logic, and a sound structure→function point (14)	14	7–11	0–5
AI-critique (Part 6) — names a specific labeling error caught and corrected with the right term (8)	8	4–6	0–3
Anatomical language — uses standard division, joint-class, and movement terms correctly throughout (4)	4	2	0–1

Quality gate (self-checked): every division, region, joint class, and movement in the key is verified against standard anatomy (OpenStax §8 intro, §9.1, §9.4; InnerBody skeletal) — femur/scapula/radius/tibia appendicular, sternum/lumbar vertebra axial; radius on the thumb side; tibia the weight-bearer; skull suture fibrous/immovable; elbow synovial/hinge (flexion-extension); hip synovial/ball-and-socket; intervertebral disc cartilaginous/slightly movable. No bone or joint is mislabeled. Anatomy-accuracy gate: PASS. There is no arithmetic in Week 9's lab, so the quantitative gate does not apply this week (the quantitative pockets were the Week 2 pH lab, the Week 3 osmolarity lab, and the Week 12 membrane-potential lab).

Provenance: built clean-room with the founder's method; resources are links to free external sites (InnerBody, OpenStax, GetBodySmart), each verified live before listing; no license/CC claims.