Kyynärvarsea

Kyynärvarsea refers to the forearm, the part of the upper limb between the elbow and the wrist. It is a crucial anatomical region responsible for a wide range of movements, including gripping, lifting, and fine motor skills. The forearm is composed of two long bones: the radius, located on the thumb side, and the ulna, on the pinky finger side. These bones articulate at both the elbow and the wrist, allowing for pronation and supination, the movements that turn the palm downwards and upwards, respectively.

Numerous muscles reside within the forearm, divided into anterior (flexor) and posterior (extensor) compartments. The anterior muscles primarily control wrist and finger flexion, while the posterior muscles are responsible for wrist and finger extension. These muscles are innervated by nerves originating from the brachial plexus, most notably the median, ulnar, and radial nerves, which also supply sensation to the forearm and hand. The forearm is also supplied by arteries branching from the brachial artery. Its anatomical structure and muscular arrangement make the forearm a vital component for human dexterity and interaction with the environment.