Nervous System Flashcards
What part of the nervous system is composed of the brain and spinal cord?
Central nervous system (CNS)
What part of the nervous system is composed of the cranial nerves, spinal nerves, and autonomic nervous system?
Peripheral nervous system
Basic unit of the nervous system
Neuron — transmits impulses
Sensory neurons control sensation and are _________ meaning they transmit messages from the PNS to CNS
Afferent
Motor neurons control mobility and are _________ meaning they transmit messages from the CNS to the PNS
Efferent
Fatty substance that surrounds and insulates the axon in a neuron and promotes faster transmission of impulses
Myelin sheath
Largest part of the brain that controls motor, cognitive, and sensory function
Cerebrum (2 hemispheres — R and L)
Structure that connects the L and R hemispheres of the cerebrum
Corpus callosum
The left hemisphere controls the _____ side of the body, while the right hemisphere controls the _____ side of the body
Right; Left
Outer layer of the cerebrum composed of gray matter
Cerebral cortex
The motor cortex is found in the _________ lobe of the brain
Frontal
Which lobe of the brain controls memory, speech and language, personality, and decision-making
Frontal
_________ area is located in the frontal lobe and is essential for speech function
Broca’s
The sensory cortex is found within the _________ lobe of the brain
Parietal
The _________ lobe of the brain is essential for interpreting signal related to things such as touch, position, pain, temperature
Parietal
The visual cortex is found within the _________ lobe of the brain
Occipital
The _________ lobe of the brain is essential for visual processing and interpretation
Occipital
The auditory cortex is found within the _________ lobe of the brain
Temporal
The _________ lobe of the brain is essential for hearing and recognizing language
Temporal
_________ area is found within the temporal lobe of the brain and is essential for the comprehension of verbal and written language
Wernicke’s
Structure located at the back of the brain beneath the occipital and temporal lobes essential for coordinating muscle movements and maintaining posture and balance
Cerebellum
Structure of the brain essential for regulating autonomic functions such as breathing, HR, and digestion
Brainstem
The spinal cord terminates around ___ or ___
L1; L2
Membrane the surrounds the brain and the spinal cord
Meninges
What are the three layers of the meninges
Dura mater, arachnoid mater, pia mater
Space between the skull/vertebrae and the dura mater
Epidural space
Space between the dura mater and the arachnoid mater
Subdural space
Space between the arachnoid mater and pia mater
Subarachnoid space
Cerebral spinal fluid (CSF) circulates in the _________ space
Subarachnoid
_____ helps to surround and cushion the CNS and provides nutrients and eliminates waste products from the nervous system
CSF
The _________ nervous helps to maintain homeostasis in the body by innervating smooth muscle, cardiac muscle, and several glands
Autonomic
Components of the autonomic nervous system
Sympathetic and parasympathetic nervous systems
The _________ nervous system is responsible for controlling the body’s fight or flight response
Sympathetic
The nerves of the sympathetic nervous system originate between ___ and ___ in the spinal cord
T1; L2
Effects of the SNS
Increased CO, vasoconstriction and increased BP, bronchodilation, pupil dilation, decreased secretions and peristalsis
The _________ system controls the body’s rest and digest response
Parasympathetic (PSNS)
Nerves associated with the PSNS originate between ___ and ___ in the spinal cord
S2; S4
Effect of the PSNS
Decreased CO, vasodilation and decreased BP, bronchoconstriction, pupil constriction, increased secretions and peristalsis
Diagnostic that allows for visualization of the cerebral blood vessels to check for blockages and other abnormalities; catheter is typically inserted at femoral artery at the groin and is threaded up through the blood vessels to the brain
Cerebral angiogram
Cerebral angiogram pre-procedure nursing care
Ensure patient has been NPO for 4-6 hrs, assess for allergy to contrast dye, assess kidney function, assess and mark pulses distal to insertion site
Cerebral angiogram post-procedure nursing care
Check insertion site for bleeding, advise patient to keep leg straight, perform neurovascular assessment distal to insertion site (pulses, cap refill, temp, color), encourage patient to increase fluid intake
Diagnostic used to identify seizures, sleep disorders, and encephalopathy; electrodes are placed on patient’s scalp and electrical activity of brain is recorded
Electroencephalogram (EEG)
EEG pre-procedure nursing care
Have patient wash hair so electrodes stick to scalp, educate patient to arrive sleep-deprived (easier to diagnose epilepsy), advise patient to avoid stimulants or sedative medications, NPO is NOT required (anesthesia not used)
EEG intra-procedure nursing care
Educate patient that hyperventilation or strobe lighting may be used to increase likelihood of seizure activity
Invasive procedure where device is inserted into cranial cavity to measure ICP
Intracranial pressure (ICP) monitoring
ICP monitoring is done in the OR and carries a major risk for
Infection
Indications for ICP monitoring
Glasgow coma scale <8
Normal ICP
10-15 mmHg
S/S of increased ICP
Initially: restlessness, irritability, headache
Progression: decreased LOC, pupil abnormalities, abnormal breathing patterns (Cheyne-stokes, BOS), abnormal posture (decerebrate, decorticate)
Diagnostic by which cerebral spinal sample is obtained from spinal canal and is analyzed for suspected meningitis, subarachnoid hemorrhage, and other neurological disorders
Lumbar puncture
Lumbar puncture pre-procedure nursing care
Have patient empty their bladder, position patient on side in fetal position OR sit up and leaned over a table (either way, patient’s back should be arched)
Lumbar puncture post-procedure nursing care
Instruct patient to lie flat for several hours and increase fluid intake, monitor for signs of CSF leak (severe headache!)
MRI pre-procedure nursing care
Assess for history of claustrophobic (administer anti-anxiety if needed), instruct patient to remove all jewelry, assess for contraindications such as metal implants (artificial joints, pacemaker), provide patient with earplugs
S/S of migraine headaches
Unilateral throbbing head pain, N/V, photophobia (light sensitivity), phonophobia (sensitivity to noise), aura
Treatment for mild and moderate migraines headaches
Mild: NSAIDs
Moderate: ergotamine, sumatriptan
Migraine headache patient education
Lay in dark, quiet environment, avoid triggers
S/S of cluster headaches
Severe unilateral NON-throbbing head pain typically around orbital region, nasal congestion, facial sweating, droopy eyelid and excess tearing, agitation and pacing
Cluster headache treatment
Ergotamine, sumatriptan, oxygen therapy, corticosteroids, verapamil
Seizure risk factors
Fever, cerebral edema, infections like meningitis, fluid and electrolyte imbalances (hyponatremia), drug or alcohol withdrawal)
Seizure characterized by three phases: tonic episode (stiffening of muscles and loss of consciousness), clonic episode (1-2 min or rhythmic jerking of extremities), postictal phase (confusion, sleepiness, agitation)
Tonic-clonic (grand-mal)
Seizure characterized by loss of consciousness for a few seconds, resembles day-dreaming. Other symptoms include picking at clothes, lip smacking, and eye fluttering
Absence seizure
Seizure characterized by brief jerking of the extremities (usually no loss of consciousness)
Myoclonic seizure
Seizure characterized by loss of muscle tone (often results in falling if patient is standing)
Atonic seizure
Examples of medications used to treat seizures
Valproic acid, carbamazepine, phenytoin
Seizure nursing care
If patient is standing or sitting, lower them to the floor or bed and turn them to their side. Loosen restrictive clothing, do NOT place anything in their mouth or restrain the patient, note the onset and duration of seizure
Post-seizure nursing care
Assess vital signs and neuro status, reorient patient, implement seizure precautions if not already done, determine possible triggers
Life-threatening complication of seizures characterized by prolonged seizure lasting more than 5 minutes or the failure to regain consciousness between seizures
Status epilepticus
Status epiplepticus risk factors
CNS infection, head trauma, drug withdrawal or toxicity
Status epilepticus treatment
Antiepileptics (Phenytoin), Benzos (lorazepam), anesthetics (propofol), barbiturates (phenobarbital)
Status epilepticus nursing care
Maintain patent airway and administer O2 as prescribed (PRIORITY!), administer appropriate medications, assist with intubation
Meningitis risk factors
Crowded conditions (dorms, prisons), immunosuppression, travel exposure