Ulnar nerve
Ulnar Nerve
The Ulnar Nerve (pronounced: UL-nar NURV) is one of the three main nerves in the human arm. It runs from the shoulder to the little finger, providing sensation and motor function to parts of the hand and forearm.
Etymology
The term "ulnar" is derived from the Latin word "ulna," which refers to the inner and larger bone of the forearm. The word "nerve" comes from the Latin "nervus," meaning "sinew, tendon, or string."
Anatomy
The Ulnar Nerve originates from the brachial plexus, a network of nerves that send signals from the spine to the shoulder, arm, and hand. It travels down the arm, passing through the cubital tunnel at the elbow and the Guyon's canal at the wrist, before branching out to supply various muscles and skin areas in the hand and forearm.
Function
The Ulnar Nerve is responsible for the sensory innervation of the little finger and the medial half of the ring finger. It also provides motor innervation to the intrinsic muscles of the hand, which are involved in fine motor tasks such as writing and typing.
Related Terms
See Also
External links
- Medical encyclopedia article on Ulnar nerve
- Wikipedia's article - Ulnar nerve
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