Difference Between Hand and Arm

The main difference between the arm and hand is the difference of their functions and structures. As the arm provides support and movement for the upper limb, while the hand specializes in intricate manipulation and fine motor skills.

Hand vs Arm

Here are the main differences between hand and arm:

Aspect	Arm	Hand
Location	Extends from shoulder to elbow	Extends from wrist to fingertips
Main Bones	Humerus, Radius, Ulna	Carpal, Metacarpal, Phalanges (finger bones)
Major Function	Supports upper limb movement	Grasping, manipulation, fine motor skills
Articulation	Joints at shoulder and elbow	Joints at wrist, knuckles, and finger joints
Muscles	Arm muscles control elbow and shoulder	Hand muscles control finger and wrist motion
Range of Motion	Limited in rotational movement	High dexterity, extensive range of motion
Sensation	Less sensitive than hand	High sensitivity due to touch receptors
Dexterity	Less dexterous compared to the hand	Highly dexterous for intricate tasks
Finger Movements	Lacks individual finger movement	Allows individual finger control
Grip Strength	Offers more power for lifting	Offers precision grip and delicate handling
Function in Actions	Power generation for lifting and pushing	Precise manipulation, tool use, gestures