Arm Bones Vector Medical Content Vector Graphic
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Short description:
The arm is composed of several bones that provide structure, and support, and enable movement. These bones are divided into the upper arm, forearm, and hand.
Upper Arm:
- Humerus:
- The single bone in the upper arm.
- Extends from the shoulder to the elbow.
- Connects with the scapula (shoulder blade) at the shoulder joint and the radius and ulna at the elbow joint.
Forearm:
- Radius:
- One of the two bones in the forearm.
- Located on the lateral (thumb) side of the forearm.
- Connects to the humerus at the elbow and to the carpal bones at the wrist.
- Ulna:
- The second bone of the forearm.
- Located on the medial (pinky) side of the forearm.
- Connects to the humerus at the elbow and to the carpal bones at the wrist.
Hand:
- Carpal Bones:
- Eight small bones are arranged in two rows at the wrist.
- Allow for the flexibility and movement of the wrist.
- Metacarpal Bones:
- Five long bones in the palm.
- Connect the carpal bones to the phalanges.
- Phalanges:
- Fourteen bones that make up the fingers.
- Each finger has three phalanges (proximal, middle, and distal), except the thumb, which has two (proximal and distal).
Key Joints:
- Shoulder Joint: Formed by the humerus and scapula, allows for a wide range of arm movements.
- Elbow Joint: A hinge joint formed by the humerus, radius, and ulna, enabling bending and extending of the forearm.
- Wrist Joint: Formed by the radius and carpal bones, allowing for the wrist's flexion, extension, and rotational movements.
These bones work together to provide strength, flexibility, and dexterity to the arm, enabling a wide range of movements necessary for daily activities.
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