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(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.
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.
Atrophy of the thenar muscles, weakness of palmar abduction, and loss of sensibility (constant numbness as opposed to intermittent paresthesia) are signs of advanced neuropathy. Advanced neuropathy is often permanent. The nerve will try to recover after surgery for more than 2 years, but the recovery may be incomplete. [113]
The thenar eminence is the mound formed at the base of the thumb on the palm of the hand by the intrinsic group of muscles of the thumb. [1] The skin overlying this region is the area stimulated when trying to elicit a palmomental reflex. The word thenar comes from Ancient Greek θέναρ (thenar) 'palm of the hand'. [2]
In "Ape hand deformity", the thenar muscles become paralyzed due to impingement and are subsequently flattened. [17] This hand deformity is not by itself an individual diagnosis; it is seen only after the thenar muscles have atrophied.
Patients with hereditary motor and sensory neuropathies are diagnosed through a physical evaluation that looks for muscle atrophy, weakness, and sensory responses. [3] In addition to this, electromyography and motor nerve conduction tests can help clinicians decide what type of motor and sensory neuropathy it is and how severe the disease is.
Symptoms vary between subtypes, but generally they can be condensed into a basic summary: individuals with this condition have symptoms that, once present, progress over time (severity increases over time), these include: muscle weakness and atrophy of the distal extremities (mostly involving feet, legs, and the thenar eminence of the hands), loss of sensation of the distal limbs, loss of ...
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.
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