Yläraaju

Yläraaju is a Finnish term that translates to "upper limb" in English. It refers to the entire arm of a human or other vertebrate, extending from the shoulder joint to the fingertips. This anatomical region is crucial for a wide range of functions, including manipulation, locomotion (in some species), and sensory perception.

The upper limb is typically composed of several distinct segments. The uppermost part is the shoulder, which connects the limb to the torso. Below the shoulder is the arm proper, extending from the shoulder to the elbow. The forearm is the section between the elbow and the wrist. Finally, the hand, including the wrist, palm, and fingers, constitutes the distalmost part of the upper limb.

Complex musculature, intricate bone structures, and a dense network of nerves and blood vessels characterize the upper limb. These components work in coordination to allow for fine motor skills, such as writing or playing a musical instrument, as well as gross motor movements like reaching and lifting. The sensory capabilities of the hand, in particular, are highly developed, allowing for detailed tactile information to be processed. The anatomical and functional complexity of the upper limb makes it a vital part of the body's interaction with its environment.