Week 9 — Readings & Resources · The Axial & Appendicular Skeleton & Joints

Course: Anatomy & Physiology I (BIOL 2301 + BIOL 2101) · Silver Oak University (fictional sample) · Prof. Navarro
Objective covered: Objective 4 — Name the bones of the axial and appendicular skeleton by region, and classify joints by structure and 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 + 2–3 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 40–50 minutes if you do everything, far less if you pick one per group.

Order that matches the lecture: ① the axial & appendicular skeleton (bones by region) → ② joint classification (fibrous / cartilaginous / synovial) → ③ the synovial joint types & movements.

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: Is this bone axial or appendicular? Which region is it in? Does the joint's class (fibrous/cartilaginous/synovial) match how much it actually moves?

① The Axial & Appendicular Skeleton — Bones by Region

Maps to Lecture Segments 2–4. The skeleton splits into the axial core (skull, vertebral column, thoracic cage — 80 bones) and the appendicular limbs + girdles (126 bones); learn the regions, the vertebral counts (7-12-5), and the killer mix-ups (radius vs. ulna, tibia vs. fibula).

Video — "The Skeletal System" (CrashCourse Anatomy & Physiology #19)
🔗 https://www.youtube.com/watch?v=rDGqkMHPDqE
Why it earns the click: an energetic ~11-minute tour that, right after the intro, lays out the structure of the skeleton — the axial and appendicular divisions (≈ 2:33) and the bone shapes (≈ 3:11). Watch at least the first half for this week's map; the second half (osteons, bone cells) reviews the tissue material from the previous skeletal week.
⏱ ~11 min

Reading — "Anatomy and Physiology 2e," Ch. 8 Introduction: The Appendicular Skeleton (OpenStax)
🔗 https://openstax.org/books/anatomy-and-physiology-2e/pages/8-introduction
Why it's assigned: the cleanest plain-language statement of the split — "the adult axial skeleton consists of 80 bones… the limbs, whose 126 bones constitute the appendicular skeleton" — plus how the pectoral and pelvic girdles anchor the limbs to the axial skeleton. A free online textbook page, no account needed. (Use the "Next" links to step into the pectoral girdle, upper limb, pelvis, and lower limb sections.)
⏱ ~10 min

② Joints — Classification (Fibrous, Cartilaginous, Synovial)

Maps to Lecture Segment 5. A joint is where two bones meet; classify it structurally by what holds the bones together (and that sets how much it moves) — fibrous (immovable), cartilaginous (slightly movable), synovial (freely movable) — which line up with the functional names synarthrosis / amphiarthrosis / diarthrosis.

Reading — "Anatomy and Physiology 2e," §9.1 Classification of Joints (OpenStax)
🔗 https://openstax.org/books/anatomy-and-physiology-2e/pages/9-1-classification-of-joints
Why it's assigned: the single best reference for the three structural classes (fibrous, cartilaginous, synovial) and the three functional classes (synarthrosis = immovable, amphiarthrosis = slightly movable, diarthrosis = freely movable), with the examples we used in class — skull sutures, intervertebral discs, the pubic symphysis. It states the rule worth memorizing: all synovial joints are diarthroses.
⏱ ~10 min

③ Synovial Joints — Their Parts, Types & Movements

Maps to Lecture Segments 6–7. Most movable joints are synovial: a fluid-filled joint cavity with articular cartilage and synovial fluid. The six types — hinge, ball-and-socket, pivot, saddle, condyloid, gliding — are named by bone-end shape and set the movements (flexion/extension, abduction/adduction, rotation, circumduction).

Reading — "Anatomy and Physiology 2e," §9.4 Synovial Joints (OpenStax)
🔗 https://openstax.org/books/anatomy-and-physiology-2e/pages/9-4-synovial-joints
Why it's assigned: the page to keep open during the lab. It walks the structural features of a synovial joint (joint cavity, articular cartilage, synovial fluid, articular capsule, ligaments) and then lists the six types with an example of each — hinge (elbow), ball-and-socket (shoulder/hip, the only two), pivot (C1–C2), saddle (thumb), condyloid (knuckles/wrist), plane (intercarpal/intertarsal). It confirms the ball-and-socket has the greatest range of motion.
⏱ ~12 min

Interactive — InnerBody "Skeletal System" Explorer (free, no download)
🔗 https://www.innerbody.com/image/skelfov.html
Why it earns the click: a free, clickable illustrated atlas of the whole skeleton, with the axial/appendicular split, the vertebral regions, and the bones by region laid out in plain text alongside the image. You'll use it in Lab 9 to identify bones and joint types; spend five minutes now getting comfortable clicking through the skull, spine, and limbs.
⏱ ~5 min (browse)

Optional one-stop references (free online)

• GetBodySmart — Skeletal System tutorials. Clean, labeled, interactive diagrams of the bones and joints, with worksheets to drill the names. A good place to return to when you want to test yourself.
  🔗 https://www.getbodysmart.com/skeletal-system
• Khan Academy — Human Anatomy & Physiology. A free unit with short articles and videos covering the skeletal system and joints. A good place to return to all term.
  🔗 https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology

Pick-one quick path (≈22 min total)

In a hurry? Do exactly these two and you'll be ready for the quiz:
1. Watch the first half of "The Skeletal System" (CrashCourse A&P #19) — the axial/appendicular divisions and bone shapes.
2. Skim OpenStax §9.1 Classification of Joints (the three structural and three functional classes — the heart of the quiz).

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.