Facts about Ulnar nerve
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Branching from cervical roots C8 and T1, the ulnar nerve supplies sensation to the medial 1.5 fingers and the corresponding dorsal hand surface through its superficial sensory branch.
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Stimulation of the ulnar nerve at the elbow produces motor responses in hand muscles within 2-3 milliseconds, making it one of the fastest conducting nerves in the human body.
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Entrapment of the ulnar nerve behind the medial epicondyle at the elbow can result from repetitive flexion activities, affecting baseball pitchers and throwing athletes with incidence rates varying by sport discipline.
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Guyon's canal syndrome occurs when the ulnar nerve is compressed at the wrist within a space bounded by the pisiform and hook of hamate bones, causing weakness in the hand's intrinsic muscles while preserving sensation.
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Froment's sign, a clinical test where patients cannot hold a piece of paper between thumb and index finger without flexing the thumb's interphalangeal joint, indicates ulnar nerve palsy affecting thumb adduction.
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Originating from nerve roots C8 and T1 in the cervical spine, the ulnar nerve is the longest unprotected nerve in the human body, traveling approximately 60 centimeters from neck to fingertips.
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Damage to the ulnar nerve causes a characteristic claw hand deformity where the ring and pinky fingers curl into a flexed position due to paralysis of the intrinsic muscles.
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At the wrist, the ulnar nerve splits into superficial and deep branches, with the deep branch traveling through the hypothenar eminence to innervate the small hand muscles.
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Compression of the ulnar nerve at the elbow, known as cubital tunnel syndrome, affects approximately 25 out of 100,000 people annually in developed countries.
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The ulnar nerve controls approximately 17 intrinsic hand muscles, enabling fine motor control of the pinky and ring fingers.