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Why is the base of the thumb treated as a separate mass in a hand sketch?

Answer and explanation

Correct answer: It affects the structure and grip of the palm

The governing concept is construction from anatomical masses. The thumb base, including the thenar region, forms a substantial wedge that joins the thumb to the palm and changes the hand’s silhouette during gripping or opposition. Treating it as a separate mass makes its volume and movement easier to place. Option A is correct; the thumb has joints and is structurally connected to the palm.

Related tags

Thumb BaseHand StructurePalmAnatomy SketchSketchingDrawing BasicsArt EducationClass 9 Mcq

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