- Abulia
- Acetazolamide
- Acupuncture
- Acute Disseminated Encephalomyelitis
- Adrenoleukodystrophy
- Affective Disorders
- Agenesis of the Corpus Callosum
- Agnosia
- AIDS
- Alcohol-related Neurological Disease
- Alexander Disease
- Alpers' Disease
- Alternating Hemiplegia
- Alzheimer Disease
- Amantadine
- Amnestic Disorders
- Amyotrophic Lateral Sclerosis
- Anatomical Nomenclature
- Anencephaly
- Aneurysms
- Angelman Syndrome
- Angiography
- Anosmia
- Anticholinergics
- Anticonvulsants
- Antiepileptic Drugs
- Antimigraine Medications
- Antiparkinson Drugs
- Antiviral Drugs
- Anxiolytics
