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ulnar nerve
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Illustration of the human upper arm from a posterior view, showing labeled muscles and nerves including the triceps brachii, deltoid, supraspinatus, infraspinatus, and several forearm extensor muscles.
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ulnar nerve

anatomy
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Illustration of the human upper arm from a posterior view, showing labeled muscles and nerves including the triceps brachii, deltoid, supraspinatus, infraspinatus, and several forearm extensor muscles.
arm muscles Muscles of the upper arm (posterior view).

The ulnar nerve is one of the three major nerves of the arm, forearm, and hand. It originates from the brachial plexus and serves two flexor muscles and various small muscles in the wrist and hand. The ulnar nerve also provides sensory innervation to medial areas of the back of the hand and contributes to the palm's sensation.1

The forearm itself is the region between the elbow and wrist, containing the radius and ulna bones. This area houses muscles, tendons, and ligaments that facilitate precise movements of the wrist, hand, and fingers. Major nerves, including the ulnar nerve, along with arteries and veins, run through the forearm, enabling complex actions like gripping and twisting motions.2

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2 Britannica Sources
  1. human nervous system - Brachial plexus
  2. forearm

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