Neuro Unit III Vocabulary Latest Update
Ischemic cascade
Series of events that damage neurons
Free radicals
Free radicals are constantly generated in the brain as by-products of the
oxidation/reduction reactions required by cellular metabolic processes. These
reactions are catalyzed by transition metals such as iron and are more likely to occur in
brain regions with a high concentration of these elements
Ideomotor apraxia
Inability to perform a task upon command, but can do it automatically
Ideational apraxia
Inability to perform a task either automatically or on command
Aphasia
Acquired communication disorder in individuals previously capable of
using language appropriately
Receptive (Wernicke's) Aphasia
Inability to comprehend language; fluent speech with frequent word substitutions
Expressive (Broca's) Aphasia
Inability to create language, with intact comprehension
Global aphasia
Inability to comprehend and create language
Homonymous hemianopsia
1. The loss of the right or left half of the field of vision in both eyes.
2. Contralateral visual field cut
3. Loss of outer half of visual field from one eye and inner half of visual field in the other
eye
4. Patient is unaware of field cut, and does not automatically compensate by turning
head
Apraxia
Difficulty in performing purposeful movements even when a person
has the ability and desire to do them
Somatoagnosia
1. Lack of awareness of body structure
2. Lack of awareness of relationship of body parts to oneself or others
3. May also be caused or made worse by proprioceptive deficits
Ischemic cascade
Series of events that damage neurons
Free radicals
Free radicals are constantly generated in the brain as by-products of the
oxidation/reduction reactions required by cellular metabolic processes. These
reactions are catalyzed by transition metals such as iron and are more likely to occur in
brain regions with a high concentration of these elements
Ideomotor apraxia
Inability to perform a task upon command, but can do it automatically
Ideational apraxia
Inability to perform a task either automatically or on command
Aphasia
Acquired communication disorder in individuals previously capable of
using language appropriately
Receptive (Wernicke's) Aphasia
Inability to comprehend language; fluent speech with frequent word substitutions
Expressive (Broca's) Aphasia
Inability to create language, with intact comprehension
Global aphasia
Inability to comprehend and create language
Homonymous hemianopsia
1. The loss of the right or left half of the field of vision in both eyes.
2. Contralateral visual field cut
3. Loss of outer half of visual field from one eye and inner half of visual field in the other
eye
4. Patient is unaware of field cut, and does not automatically compensate by turning
head
Apraxia
Difficulty in performing purposeful movements even when a person
has the ability and desire to do them
Somatoagnosia
1. Lack of awareness of body structure
2. Lack of awareness of relationship of body parts to oneself or others
3. May also be caused or made worse by proprioceptive deficits
