Neuro week 1 Flashcards
What does the central nervous system consist of?
Brain and spinal cord
What does the peripheral nervous system consist of?
cranial nerves and spinal nerves
Nervous system function
Control all motor, sensory, autonomic, cognitive and behavioral activities
What is the PNS further divided into?
somatic and autonomic
Synapse
gap between where the two neurons meet. Either the neuro is going to tell the next one to do something (excite) or stop (inhibit)
What does a neuron do?
Communicate messages/information from one neuron to the next or to the target cell. They either stimulate/terminate the activity of the target cell.
Catecholamine: when are they released?
in response to physical or emotional stress
What are examples of catecholamines?
Noradrenaline
Adrenaline (epinephrine)
Dopamine
What does adrenaline (epinephrine) do?
Hormone produced outside the brain, break down in communication, weakness and rapid fatigue of muscles under voluntary control.
Acetylcholine
major transmitter of the parasympathetic nervous system
Acetylcholine - source
Many areas of the brain; autonomic nervous system
Acetylcholine: action
Usually excitatory; parasympathetic effects sometimes inhibitory (stimulation of heart by vagal nerve) – voluntary muscle contraction, controls heartbeat, and stimulates hormones
Acetylcholine: example of dysfunction
↓ Leads to Myasthenia gravis
Serotonin: source
-Brainstem, hypothalamus, dorsal horn of the spinal cord
Serotonin: action
Inhibitory, helps control mood and sleep, inhibits pain pathways, regulation of appetite and temperature
Serotonin: example of dysfunction
↓ Leads to depression
Dopamine: source
Substantia nigra and basal ganglia
Dopamine: action
Usually inhibits, affects behavior (attention, emotions) and fine movement but can also be excitatory
- Plays a role in behavior, learning, sleep, mood, focus, attention, immune health, pleasurable reward
Dopamine: example of dysfunction
↓ Leads to Parkinson disease (found in the basal ganglia. Hard for them to initiate movement and to smooth movement out)
Norepinephrine: what?
(major transmitter of the sympathetic nervous system) * fight or flight
NE: source
Brainstem, hypothalamus, postganglionic neurons of the sympathetic nervous system
NE: action
Usually excitatory; affects mood and overall activity
Seen rarely
Gamma-aminobutyric acid (GABA): source
Spinal cord, cerebellum, basal ganglia, some cortical areas
GABA: action
Inhibitory
*Mood modulator – Low levels lead to restlessness, anxiety and irritability
GABA: example of dysfunction
↓ Leads to seizures
Enkephalin, endorphin: source
Nerve terminals in the spine, brainstem, thalamus and hypothalamus, pituitary gland
Enkephalin, endorphin: action
Excitatory; pleasurable sensation, inhibits pain transmission
Enkephalin, endorphin: example of dysfunction
Poor pain control
If we do not have enough endorphins lack of pain control
Cerebrum consists of what?
2 hemispheres Thalamus hypothalamus basal ganglia connections for cranial nerve II and II
What does brainstem consist of?
midbrain
pons
medulla oblongata
connections for cranial nerves III through XII
Thalamus
relays information regulation of conscious and alertness
Hypothalamus job
Important for endocrine system
Regulates the pituitary secretion of hormones influencing metabolism, reproduction, stress response, and urine production
It works with the pituitary to maintain fluid balance
Emotional, Responses, aggressive and sexual behavior
Hunger, sleep/wake cycle, BP
Controls and regulates the autonomic nervous system and maintains temperature regulation by promoting vasoconstriction or vasodilatation.
Basal ganglia function
Controls fine motor movments
Planning and coordinating movements and posture
Inhibit unwanted muscular movement
Disorders results in exaggerated uncontrolled movements
Muscle rigidity
Athetosis
Chorea
Parkinson disease
Huntington disease
Spasmodic torticollis
Athetosis
Movement of a slow, squirming, writhing, twisting
Chorea
spasmodic, purposeless, irregular, uncoordinated motions of the trunk and extremities and facial grimacing
Brainstem function
autonomic function (involuntary), HR, breathing, swallowing
Midbrain, pons function overall
Motor and sensory pathways
Pons (portion of it) controls what?
HR, respiration and BP
Medulla oblongata: function
respiratory function
Cerebellum function
Coordination and movement Balance (postural) Awareness of body parts. Balance Coordination Timing Damage results in loss of muscle tone, weakness, fatigue Ataxia and incoordination
Frontal lobe
Largest lobe
The major functions are concentration, abstractthought, information storage or memory, and motor function.
The frontal lobe is responsible in large part for a person’s affect, judgment, personality, emotions, attitudes, and inhibitions, and contributes to the formation of thought processes.
Motor strip location
Location: frontal lobe
lies in the frontal lobe, anterior to the central sulcus
What does the motor strip do?
responsible for muscle movement
What are nursing consideration when working with a client who has damage to temporal lobe?
receptive speech issues, effected long term memory…reinforce teaching, chart to help them ID letters/objects to help them communicate what they want/need, pictures to remind family members, patience with them, giving them time to determine if they have aphasia or are confused, yes/no questions
What are nursing considerations when working with a client who has damage to their frontal lobe?
safety, fall risk, siderails (only 3 max.), etc.
Parietal lobe function
primary sensory cortex
This lobe analyzes sensory information such as pressure, vibration, pain, and temperature, and relays the interpretation of this information to the thalamus from the sensory cortex.
It is also essential to a person’s awareness of the body in space, as well as orientation in space and spatial relations.
Where is the parietal lobe?
posterior to the motor strip
Stereogenesis
ability to perceive an object using the sense of touch
processed in parietal lobe
What are nursing considerations when working with a client who has damage to parietal lobe?
walkers/assistive devices, communicate location of belongings/food, assistance while getting up, good lighting, correct temperature, nonverbal cues, remove tripping hazards)
Temporal lobe function
contain the auditory receptive areas
The interpretive area of the temporal lobe provides integration of visual and auditory areas and plays the most dominant role of any area of the cortex in thinking
Long-term memory recall is also associated with this lobe.
Where are the auditory and receptive areas located in the temporal lobe?
around temple regions
What is located in the posterior region of the temporal lobe
is the area responsible for receptive speech referred to asBroca’s area and Wernicke’s area.For most people, whether right- or left-handed, Broca’s area and Wernicke’s area. is in the left lobe
Occipital lobe function
primary visual cortex
visual reflexes
involuntary eye movements.
Nursing considerations when working with a client who has occipital lobe damage?
placing belongings/food close and describing where it is/placing belongings in their center field of vision
What are the structures that protect the brain?
Bones
Membranes
Fluid cushioning
Chemical (?)
Skull
Hard, protecting it from injury
What are meninges?
connective tissue covering the brain and spinal cord
Provides protection, support and nourishment
What are the 3 meningeal layers?
dura, arachnoid and pia
Dura
outermost meningeal layer, very tough, thick, inelastic, fibrous and gray
Epidural layer
potential space that lies outside the dura (meninge)