Arm muscles (upper arm, forearm, hand)

Draw the main muscles and surface forms of the upper arm, forearm, and hand in different poses.

What it is

Study the main muscle groups of the arm: the biceps and triceps in the upper arm, the flexor and extensor masses in the forearm, and the forms shaping the palm and back of the hand.

Relate visible bumps, grooves, and plane changes to muscle structure. Track how the biceps and triceps change with flexion, and how forearm muscles bunch near the elbow before tapering into tendons at the wrist.

Place the thumb and pinky muscle pads, knuckles, and back-of-hand tendons in fists and spread hands. Keep these forms consistent with the underlying bones and muscles.

Why it matters

This skill helps you vary arm and hand poses while keeping their surface forms consistent. Weak control can produce smooth tubular arms, misplaced muscle changes, or hands with stiff, symbolic forms.

You can check it when

• ✓Draw relaxed and flexed arms from the same angle, showing corresponding changes in the biceps, triceps, and forearm masses.
• ✓Draw the upper-arm and forearm masses around the elbow, plus the hand's knuckles, tendons, and thumb and pinky pads, in front, side, and angled views.

Related skills

• Arm and hand skeleton (humerus, radius/ulna, hand)
• Simplifying anatomy into usable surface forms
• Muscle changes during movement
• Hand construction (palm, fingers, thumb mechanics)
• Hands in action (gestures, foreshortening, holding objects)
• Limbs and extremities as simple forms (arms, legs, hands, feet)
• Plane analysis and turning form with value