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Mark with a surface marking pen the line of the Carpo-Metacarpal  joint of the Thumb in the Anatomical Snuffbox on a model in the Anatomical position with a time limit of one minute.

 Objective No 25 - Criteria to be demonstrated.

1. Identify  and mark the Styloid process of the Radius. (Objective No 12)

2. Identify and mark the  anterior  projection of the Scaphoid  bone. (Objective No  19)

3. Palpate   and mark the  lateral projection of the  Scaphoid bone in the Anatomical Snuffbox between the tendons of Extensor Pollicis Longus and Brevis (Objectives  Nos 63 and 64 ).

4. Palpate and mark the  lateral projection of the Trapezium bone distal to the Scaphoid in the Anatomical Snuffbox

5. Palpate  the  prominent Base of the First Metacarpal bone immediately distal to the Trapezium in the Anatomical Snuffbox

6. Place the tip of the palpating finger on the Trapezium and Base of the First Metacarpal bone.

7. Request the model to  fully flex and extend the  Thumb  while maintaining the position of the palpating finger  tip in the Anatomical Snuffbox (Step 6).

8. Detect the gliding movement  at the joint between the Trapezium and Base of the First Metacarpal bone of the Thumb and mark the joint line in the floor of the Anatomical Snuffbox.

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