Neuro Flashcards
Acetylcholine
Part of autonomic nervous system; usually excitatory; may be inhibitory (heart vagal nerve)
Serotonin
Inhibitory; controls mood sleep, inhibits pain
Dopamine
Inhibitory; affects behavior (attention, emotion) fine movement
Norepinephrine
Excitatory; affects mood and overall activity
Gamma-aminobutyric acid
Inhibitory
Enkephalin / Endorphin
Excitatory; Pleasurable sensation; inhibits pain transmission
Corpus Callosum
connects the two hemispheres of the brain
Thalamus
Thalamus relay station for senses except smell. (memory, sensation, and pain impulses)
Hypothalamus
Important in the endocrine system
Works with the pituitary
Temperature regulation
Hunger center / appetite control
Sleep–wake cycle, blood pressure, aggressive and sexual behavior, and emotional responses (i.e., blushing, rage, depression, panic, and fear
Controls / regulates ANS
Basal ganglia
responsible for control of fine motor movements, including those of the hands and lower extremities
Frontal
is the largest lobe, front of the brain. Function: concentration, abstract thought, information storage / memory, and motor function. Broca’s speech area (Speech affected but comprehension preserved). Responsible for person’s affect, judgment, personality, and inhibitions
Parietal
analyzes sensory information and relays the interpreted information to the cortex. Essential to person’s awareness of body position in space, size, shape, and right-left orientation.
Temporal
contains the auditory receptive areas, plays role in memory of sound and understanding of language and music
Occipital
responsible for visual interpretation and memory.
Brain Stem
midbrain, pons and medulla
Center for auditory and visual reflexes.
Reflex centers for respiration, blood pressure, heart rate, coughing, vomiting, swallowing, and sneezing are also located in the medulla.
Cerebellum
located behind the brain stem and under the cerebrum
Smooth coordinated movement.
Controls fine movement, balance, andposition (postural) senseor proprioception (awareness of position of extremities without looking at them)
Meninges
Three layers – anchor the spinal cord
Dura mater
Arachnoid
Pia mater
CSF
CSF is important in immune and metabolic functions in the brain.
The fourth ventricle drains CSF into the subarachnoid space on the surface of the brain and spinal cord
Cerebral Circulation
arteries and veins
Provides nutrients and O2 to brain tissue
About 15-20% of Cardiac Output
Blood-brain barrier
protective function formed by endothelial cells of the brain’s capillaries
On Old Olympus Towering Tops A Fin and German Viewed Some Hops
Olfactory
Optic
Oculomotor
Trochlear
Trigeminal
Abducens
Facial
Auditory
Glossopharyngeal
Vagus
Accessory
Hypoglosseal
Positron Emission Tomography (PET)
Computer-based nuclear imaging. PET permits the measurement of blood flow, tissue composition, and brain metabolism and thus indirectly evaluates brain function.
Single Photon Emission Computed Tomography (SPECT)
SPECT is a three-dimensional imaging technique. SPECT is useful in detecting the extent and location of abnormally perfused areas of the brain, thus allowing detection, localization, and sizing of stroke
Myelography
X-ray of subarachnoid space through a lumbar puncture
Transcranial Doppler
Records blood flow velocities of intracranial vessels
Myelography
Uses contrast to evaluate the spinal cord, nerve roots, and spinal linings.
Electroencephalogram (EEG)
records of the electrical activityof the brain
Omit coffee tea, cola, chocolate
MAY have meal
Sleep deprivation, Withhold anticonvulsants, tranquilizers, stimulants, and depressants 24-48 hours before
Electromyography (EMG)
Evaluates muscle and nerves (motor neurons) that control them. Measures changes in the electrical potential of the muscles
Lumbar puncture
Assesses cerebral spinal fluid for viruses, bacteria, CSF pressure, administration of medications
Complications: Post-lumbar puncture headache, herniation of the brain, abscess, hematoma, meningitis, difficulty voiding, elevated temperature, backache / spasms, & stiff neck
Babinski’s Reflex
Indicative of upper motor neuron lesion
Abnormal is dorsiflexion of the toes (fanning)
CT
with or without contrast (if they have mental status changes, we are going to do without contrast first to see if it is hemorrhagic. Contrast spilling out into brain is bad)
MRI
See if they have any metal in their bodies, ask them if they are preggers, which kind of work they do. Any metal will get sucked right out
Akinetic Mutism
no response to the surroundings
Brain dead
no level of activity (keep alive for organ donation)
Coma
clinical state of unarousable of unresponsiveness
Decerebration
this is a type of posturing. They stretch out away from the body upon touch
Decortication
the patient will automatically pull their arms to their chest upon touch
Locked in syndrome
aware of what is going one but cannot move or talk
Persistent vegetative State
unresponsive, but they still do the sleep wake cycle. No mental or cognitive function
Status Epilepticus
form of epilepsy where the seizure lasts more than normal, and it was one seizure after another without recovery period and does not respond to normal treatments
Weight of brain
1400 g
Blood
75mL
CSF
75mL
ICP measured in lateral ventricles. Normal value
0-10, 15 is the highest
Monro-Kellie hypothesis
Sum of volumes of brain, CSF, and intracranial blood is constant
Limited space for expansion within the skull
An increase in any one of the components causes a change in the volume of the others
Primary Cause of Increased ICP
Head Trauma
Secondary causes of increased ICP
Brain tumors
Subarachnoid hemorrhage
Toxic or viral encephalopathies
Effects of ICP
↓ Cerebral perfusion
Stimulates edema
Causes herniation
Cerebral edema
an abnormal accumulation of water or fluid in the intracellular space, extracellular space or both d/t an increase in the volume of brain tissue
Autoregulation
Brain’s ability to change the diameter of its blood vessels to maintain constant cerebral blood flow during alterations in SBP.
Cushings Triad r/t Increased Intracranial Pressure
as increase in systolic BP, widening of the pulse pressure and slowing of heart rate late sign requiring immediate intervention
Clinical Manifestations of Increased Intracranial pressure
Changes in LOC
Abnormal respiratory and vasomotor responses
Restlessness
Confusion
Increased drowsiness
Increased Intracranial Pressure Goal
Decreasing cerebral edema
Lowering volume CSF
Decreasing cerebral blood volume
Increased Intracranial Pressure treatment
Osmotic diuretics
Restricting fluids
Draining CSF
Controlling fever
Maintaining BP and oxygenation
Reducing cellular metabolic demands
Seizures
Episodes of abnormal motor, sensory, autonomic or psychic activity
Burr Holes
hole through the skull to release fluid
Craniotomy
opening the skull
Craniectomy
removing the skull
Cranioplasty
Replacing the skull
Generalized SZ`
Both Sides of the brain
Focal SZ
originates within one side of the brain and typically doesn’t spread
Unknown SZ
don’t fit in either category
Underlying cause of SZ
is an electrical disturbance (dysrhythmia) in the nerve cells in one section of the brain
Symptoms of SZ
Loss of consciousness
Excessive movement
Loss of muscle tone or movement
Disturbance of behavior, mood, sensation, and perception
Causes of SZ
Cerebrovascular disease
Febrile (childhood)
Hypoxemia
Head injury
HTN
CNS infections
Metabolic and toxic conditions
Brain tumor
Drug and ETOH withdrawal
Allergies
Generalized SZ Symptoms
BIL hemispheres involved
Intense rigidity of entire body
Alternating muscle relaxation and contraction
Tonic-Clonic contractions
Tongue often chewed
Incontinent of urine and feces
After 1-2 minutes:
Movement subsides
Relaxes and lies in deep coma breathing noisily
Postictal State
Focal SZ Symptoms
which affect initially only one hemisphere of the brain - You might be aware of what is going on around you in afocal seizure, or you might not. Different areas of the brain (lobes) are responsible for controlling all of our movements
Diagnostics for SZ
Electroencephalography (Motor tool)
CT/MRI: R/O lesions
PET / Single-photon emission computed tomography (SPECT)–Measures cerebral blood flow
Complete seizure profile and history: Includes baseline neurologic exam, Description of seizure activity
Lab studies
Interventions during a Seizure
Maintain airway
Use jaw-thrust
**DO NOT attempt to open the airway with your fingers
Keep suction available
Prevent injury
Observe seizure activity
Document seizure activity
Administer appropriate anticonvulsant
Privacy
Loosen clothing
Epilepsy
A group of syndromes characterized by unprovoked, recurring seizures
Epilepsy classified by specific patterns
Age of onset
Family history
Seizure type
Electro-clinical syndrome
is a term used to identify a group of clinical entities showing a cluster of electro-clinical characteristics, with signs and symptoms that together define a distinctive, recognizable, clinical disorder.
Risk Factors for Epilepsy
Genetic
Birth trauma
Asphyxia neonatorum
Head injuries
Hormonal
Infections
Toxicities
Fever
Circulatory problems
Metabolic disorders
Drug/Alcohol intoxication