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The human arm consists of three sections, the upper arm, forearm, and hand, containing 32 bones in each (62 in both arms), as well as consisting of many nerves and blood vessels.
Upper Arm
Upper Arm
Forearm
Forearm
The forearm is the region of the wrist and elbow, consisting of the ulna and radius bones, running parallel to each other.
Forearms have muscles, tendons, nerves, and blood vessels contributing to the intricate movements and functions of hands and fingers. It's crucial for us to grip, lift, or rotate the hand and forearm.
The ulna is on the forearm's inner side, mainly larger and longer than the radius. It's from the elbow to the wrist on the side of the pinky finger contributing to the forearm's stability.
The radius is on the forearm's outer side. It extends from the wrist's elbow on the thumb's side. The radius is more involved in the forearm's rotational movements, helping the hand to rotate.
They are crucial for the arms' flexibility and movement.
It should be known that most bones do not intersect, allowing us to easier illustrate many anatomical structures in one image, like in science textbooks.
Like for the "palms facing forward", the radius and ulna don't cross each other, remaining parallels.
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