AN3.1-3 | General features of Muscle — Summary & Reflection

REFLECT

Kolb Reflection — General Features of Muscle

Take 5 minutes to reflect before the Practice Quiz. Write your answers in a notebook.

1. Concrete Experience (What did I learn about?)
Briefly name the three main ideas from this SDL: classification, parts of muscle, and shunt vs spurt.

2. Reflective Observation (What surprised or confused me?)
Was there anything that contradicted what you expected? E.g., did the shunt/spurt classification differ from how you thought muscles work?

3. Abstract Conceptualisation (How does this connect to other subjects?)
Complete this sentence: "Tendons heal slowly because _, which I understand better from what I am learning in Biochemistry about _."

4. Active Experimentation (What will I do next?)
Next time you are in the anatomy hall, identify: (a) the epimysium on a dissected muscle specimen, (b) whether the muscle specimen is a spurt or shunt muscle, and (c) where its tendon or aponeurosis begins.

KEY TAKEAWAYS

What You Have Learned — General Features of Muscle

AN3.1 — Classification of Muscles
• Three structural types: skeletal (striated, voluntary, peripheral nuclei), cardiac (striated, involuntary, intercalated discs, central nucleus), smooth (non-striated, involuntary)
• Muscles named by: shape, size, region, action, number of heads
• "S-V-P rule": Skeletal = Striated + Voluntary + Peripheral nuclei

AN3.2 — Parts of Skeletal Muscle + Tendons vs Aponeuroses
• Connective tissue hierarchy: Epimysium (muscle) → Perimysium (fascicle) → Endomysium (fibre)
• Muscle fibre: multinucleated, peripheral nuclei, sarcolemma, sarcoplasm, myofibrils, sarcomeres
• Tendon: cord-like, dense regular connective tissue, poor blood supply, e.g., Achilles
• Aponeurosis: flat, sheet-like tendon, distributes force, e.g., palmar/plantar/epicranial

AN3.3 — Shunt and Spurt Muscles
• Spurt = pull across bone → angular movement (mover) — e.g., Brachialis
• Shunt = pull along bone → joint compression/stabilisation (stabiliser) — e.g., Brachioradialis
• Both are always needed: spurt moves the limb; shunt protects the joint
• Clinically important during rapid movements — shunt prevents joint dislocation

Cross-Subject Links
• Physiology: Muscle physiology (NMJ, contraction) — same fibres, deeper mechanism
• Biochemistry: ECM (collagen in tendons + sheaths), poor blood supply → slow healing

Estimated reading time: 18–22 minutes | NMC CBME Competencies: AN3.1, AN3.2, AN3.3