Neupsy Key

Meningiomas are the most common primary central nervous system tumor. These extraaxial tumors can arise from the dura at any site along the neuroaxis, although are most frequently found at…

Diffusely infiltrating gliomas are a heterogenous group of central nervous system tumors arising from glial cells, such as astrocytes and oligodendrocytes. The diagnosis, classification, and treatment of gliomas have evolved…

Acute rhabdomyolysis is a medical emergency that often requires hospitalization for infusion of intravenous fluids to protect from renal injury. In the acute period, the cause of rhabdomyolysis and the…

Myotonia is a failure of muscle cell relaxation manifesting clinically as impaired relaxation after voluntary muscle contraction (e.g., grip myotonia, Video 100.1) or prolonged reflexive contraction during specific neurological examination…

Myopathy, a disorder of muscle, should be suspected in patients with weakness without numbness. The diagnosis is supported by elevated creatine kinase (CK) levels, although a normal CK does not…

A. Myasthenic crisis is a life-threatening, rapid worsening of myasthenia gravis (MG) leading to respiratory failure requiring intubation or noninvasive ventilation. Impending crisis is rapid clinical worsening that could lead…

Myasthenia gravis (MG) is an autoimmune disorder caused by antibodies directed against the postsynaptic neuromuscular junction of skeletal muscle. MG is characterized by fluctuating weakness that worsens with activity and…

Motor neuron disease refers to a disease process affecting one or both of the two neurons in the motor circuit: (1) the upper motor neurons (UMNs), which originate in the…

The lumbosacral plexus is formed from the L1–S3 nerve roots. It is divided into an upper component (the lumbar plexus), which innervates hip flexion, hip adduction, and knee extension, and…

The brachial plexus is formed from the C5–C8 and T1 nerve roots. It is divided into three trunks: the upper trunk is formed by the junction of the C5 and…