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In the thenar eminence, the recurrent branch of the median nerve provides motor innervation to: [4] opponens pollicis muscle; abductor pollicis brevis muscle; superficial part of flexor pollicis brevis muscle; A separate, more proximal branch of the median nerve additionally provides motor innervation to the 1st and 2nd lumbricals of the hand.
In medicine, split hand syndrome is a neurological syndrome in which the hand muscles on the side of the thumb (lateral, thenar eminence) appear wasted, whereas the muscles on the side of the little finger (medial, hypothenar eminence) are spared.
In uncooperative patients, the skin wrinkle test offers a pain-free way to identify denervation of the fingers. After submersion in water for 5 minutes, normal fingers will become wrinkled, whereas denervated fingers will not. [16] In "Ape hand deformity", the thenar muscles become paralyzed due to impingement and are subsequently flattened. [17]
Muscle pain symptoms. Most of us have felt the pain of a sore muscle after too many squats or a long walk. "The muscle will hurt when you use that muscle, and when you stop using that muscle, it ...
(D) Advanced thenar muscle atrophy. [8] Signs and symptoms depend on the specific disease, but motor neuron diseases typically manifest as a group of movement-related symptoms. [6] They come on slowly, and worsen over the course of more than three months. Various patterns of muscle weakness are seen, and muscle cramps and spasms may occur.
When pain is the primary symptom, carpal tunnel syndrome is unlikely to be the source of the symptoms. [10] When the symptoms and signs point to atrophy and muscle weakness more than numbness, consider neurodegenerative disorders such as Amyotrophic Lateral Sclerosis or Charcot-Marie Tooth. [77] [78] [79]
It also supplies the muscles of the thenar eminence by a recurrent thenar branch. [8] The rest of the intrinsic muscles of the hand are supplied by the ulnar nerve. The median nerve innervates the skin of the palmar (volar) side of the index finger , thumb , middle finger , and half the ring finger , and the nail bed .
Symptoms can range from minor to severe and can be obvious or subtle. The right arm and hand are more likely to be affected than the left. Symptoms include atrophy of the arm or hand, claw hand, constant crying (due to pain), [10] intrinsic minus hand deformity, [11] paralysis of intrinsic hand muscles, and C8/T1 Dermatome distribution numbness.