AN13.1-8 | General Features, Joints, radiographs & surface marking (Upper Limb) — Summary & Reflection

REFLECT

Take a moment to practise on yourself. Sit in the anatomical position and try the following:

1. Feel three bony landmarks: the jugular notch, the medial epicondyle of the elbow, and the styloid process of the radius. Can you identify them without looking at a diagram?
2. Trace the path of the cephalic vein from the back of your hand to the deltopectoral groove. Can you see it through your skin?
3. Test your biceps: flex your elbow against resistance with your other hand, and feel the muscle belly contract. Now test your deltoid by abducting your arm.
4. Reflect: Which of the 8 competencies in this module do you feel most confident about? Which one needs more revision? Write down one concept you found surprising and one clinical application you want to learn more about.

Remember — anatomy is a "doing" subject. Every time you examine a patient, feel a pulse, or read an X-ray, you're applying what you've learned here.

KEY TAKEAWAYS

Key Takeaways — one per competency:

1. AN13.1 — Fascia & Veins: The upper limb has superficial and deep fascia. Deep fascia creates compartments (anterior/posterior in arm; three in forearm). The cephalic vein (lateral) and basilic vein (medial) are the main superficial veins. The median cubital vein at the elbow is the primary site for venipuncture. All lymph ultimately drains to axillary lymph nodes.

1. AN13.2 — Dermatomes: C5-T1 supply the upper limb skin in a lateral-to-medial pattern. Autonomous zones: C6 = thumb tip, C7 = middle finger tip, C8 = little finger tip.

1. AN13.3 — Major Joints: The elbow is a compound hinge joint (3 articulations, 1 capsule). The wrist is an ellipsoid joint (radius + disc articulate with proximal carpal row). Pronation/supination occurs at the radio-ulnar joints, not the wrist.

1. AN13.4 — Other Joints: The sternoclavicular joint is the only bony link of the upper limb to the axial skeleton. The first CMC joint (saddle type) allows thumb opposition. MCP joints should be splinted in flexion (position of safety).

1. AN13.5 — Radiographs: Use the ABCs method. In children, know the CRITOE mnemonic for elbow ossification centres. Check the anterior humeral line and Gilula's arcs.

1. AN13.6 — Bony Landmarks: Spine of scapula = T3. Inferior angle = T7. At the elbow, medial epicondyle + lateral epicondyle + olecranon form an equilateral triangle in flexion. The anatomical snuffbox overlies the scaphoid.

1. AN13.7 — Surface Projections & Muscle Testing: Radial artery pulse at the wrist (lateral to FCR tendon). Allen's test before radial cannulation. Test serratus anterior by wall push (winging = long thoracic nerve palsy). Test deltoid by resisted abduction.

1. AN13.8 — Development: Limb buds appear in week 4. AER drives proximal-distal growth, ZPA (SHH) controls anterior-posterior pattern. Digits separate by apoptosis (failure = syndactyly). Upper limb rotates laterally; lower limb rotates medially.