Neurological Flashcards
What does the CNS consist of?
Brain and spinal cord
What does the PNS consist of?
12 pairs of cranial nerves
31 pairs of spinal nerves
ANS (parasympathetic and sympathetic)
What is the sympathetic nervous system responsible for?
Fight or flight
What is the parasympathetic nervous system responsible for?
Rest and digest Salivation Lacrimation Urination Defecation Digestion
What are the layers of the spinal cord?
Epidural space Dura mater Subdural space Arachnoid mater Subarachnoid mater Pia mater
What is dura mater?
Protective covering for brain tissue
What makes up brain matter?
Gray and white matter
Do we have more gray or white matter?
Gray (demyelinated)
What does arachnoid mater do?
Like a spiderweb, holds white mater in place
What is pia mater?
Mater full of nerves and blood supply to brain
Where is CSF found?
Subarachnoid space
What does CSF do?
Provides cushion
Removes metabolic waste
Provides nutrition
Maintains normal ICP
What factors increase ICP?
BP sometimes Hypotonic solutions Lots of Na Lying down flat Rectal temps/suppositories (usually) Constipation/anything that increases strain (coughing)
What are the parts of the brain?
Cerebrum (cerebral cortex)
Cerebellum
Brainstem
Diencephalon
What makes up the diencephalon?
Hypo and thalamus
What vessels supply the brain?
2 internal carotid arteries
2 vertebral arteries
What is the largest part of the brain?
Cerebrum
Into what 4 parts is the cerebrum divided?
Frontal
Parietal
Temporal
Occipital
What is the frontal lobe responsible for?
Personality Speech Memory Behavior Emotion Intellectual function
What is the parietal lobe responsible for?
Sensation
What is the temporal lobe responsible for?
Hearing
Taste
Smell
What is the occipital lobe responsible for?
Visual reception
What is the hypothalamus responsible for?
Homeostasis Body temp Hunger Thirst Storage and secretion of hormones
What is the thalamus responsible for?
Relays info to parts of cerebral cortex
Regulates states of sleep and wakefulness
What can damage of the thalamus lead to?
Coma state
What two systems does the hypothalamus connect and how?
Hypothalamus connects the CNS with the endocrine system through the pituitary gland
Where is the diencephalon located?
On top of the brainstem
What does the brainstem consist of?
Midbrain
Pons
Medulla oblongata
What is the midbrain responsible for?
Processing visual and auditory info
Initiating involuntary motor responses
Maintaining consciousness.
What is the pons responsible for?
[physically] Connecting cerebellum to brainstem
Motor control
What is the medulla responsible for?
[physically] Connects brain and spinal cord
Involuntary functions Primitive life maintenance
Heart function
Breathing
Sneezing
Coughing
Vomiting
What happens if the brainstem herniates?
One is clinically dead by law
What is the cerebellum responsible for?
Coordination of voluntary movement
Equilibrium/balance
Muscle tone
Proprioception
What does a cerebellar injury lead to?
Uncoordinated movement
What is ataxia?
Uncoordinated movement
What is the spinal cord?
Continuation of the medulla
“Central highway” for sensory and motor impulses
Where does the spinal cord begin?
The base of the skull (foramen magnum)
What is the cauda equina?
Where L1 and L2 branch into lumbar and sacral nerve roots
What are the pairs of spinal nerves?
8 cervical 12 thoracic 5 lumbar 1 coccygeal 5 sacral
What do motor (efferent) roots do?
Carry impulses from brain to the spinal cord to the muscles & glands
What do sensory (afferent)
Carry impulses from sensory receptors of the body through the spinal cord to the brain
What is a dermatome?
Band of skin innervated by the sensory nerve root of a single spinal segment
When testing sensation, what area should be tested first?
Distal point
What is hypoesthesia?
Decreased sensation
What is hyperesthesia?
Excessive sensation
What is anesthesia?
Loss of sensation
What is paresthesia?
Numbness, tingling, burning
What is the reflex arc?
Tapping the tendon of a partially stretched muscle, activating sensory fibers within the muscle
What abnormal sensation can be present in diabetes?
Paresthesia, which turns into hypoesthesia
When is hyperesthesia seen?
Shingles - touching hand and feeling like there’s something there
CNS defect
How does a reflex arc work?
Impulses travel to the spinal cord via peripheral nerves where they cross the NMJ and the muscle contracts
When is hypoesthesia seen?
Old age - reflexes decrease
What is CN I?
Olfactory
Sensory
Smelling odors with eyes closed
What is CN II?
Optic
Sensory
Snellen/confrontation
What is CN III?
Oculomotor Motor H test Levetator palpebral muscle Pupil constriction - direct and indirect (consensual)
What is CN IV?
Trochlear
Motor
H test
What is CN V?
Trigeminal Sensory Regions of face sensation on both sides: temporal, maxillary, mandibular feeling Corneal reflex Motor Movement of jaw
What is CN VI?
Abducens
Motor
H test
What is CN VII?
Facial Sensory Anterior ⅔ of tongue taste Motor Smile, frown, puff cheeks, move eyebrows
What is CN VIII?
Vestibulocochlear
Sensory
Hearing
Whisper, weber (lateralization), rinne
What is CN IX?
Glossopharyngeal Sensory Posterior ⅓ of tongue taste Motor Gag reflex/AHHHH
What is CN X?
Vagus Sensory Relay information to organs/glands of body (did not study) Motor Gag reflex/AHHHH
What is CN XI?
Accessory
Motor
Shrugging shoulders, turning of head
What is CN XII?
Hypoglossal
Motor
Tongue movement - up, down, side to side
How do you check cerebral function?
Brief (mini) Mental Status LOC Remote memory (LTN) Recent memory Orientation (person, place, time, situation - A&Ox4) Mood Thought content Test balance & coordination Point to Point - Upper Extremities - Lower Extremities. Alternating Movements: - Upper Extremities - Lower Extremities. Gait Tandem Gait Romberg
How do you test proprioception?
Touch eye and touch nurse’s finger, then close eyes and continue to test
What is the alternating movement test?
Take body part and flip back and forth
What is tandem gait walking?
Walking heel to toe
What is the Romberg test?
Pt must be standing
Should be able to stand feet together hands to sides with eyes closed for 20-30 seconds
Cerebellar lesion will force someone to step out when they close their eyes
+ Romberg - sign of cerebellar dysfunction
How is sensory interpreted?
By the cerebral cortex
How do you assess sensory?
Upper and lower extremities Sharp and soft objects Distal parts first Tuning fork on joint Position sense Two point discrimination Stereognosis Extinction Point location
How does paresthesia affect sensory assessment?
May prevent pt from feeling the touch
How do you test position sense?
Have pts put hands in correct anatomical position
Move their finger up, down, left, right to demonstrate
Have pt close eyes and ask in what direction you’re moving their finger
How do you test two point discrimination?
Only do pads of fingers and thighs
Tell pt you’ll touch area with object
Say you’re touching at two points
Have pt close eyes and ask them to say when they don’t feel 2 points anymore
Body cannot discriminate between feeling 1 point and 2 points once the points are close enough together
You can usually feel 2 points for up to 5 mm
How do you test stereognosis?
Ask pt to identify familiar object in hard with eyes closed
How do you test graphesthesia?
Drawing numbers on the pt’s hand with their eyes closed
How do you test extinction?
Touch either one or both sides have pt close eyes and say if you touched one or both sides
How do you test point location?
Close pt’s eyes and touch a point in their body. Have pt open eyes and touch where you touched
What is spasticity?
Muscle in constant contraction
Stiff
Harder to do passive ROM
What is rigidity?
Increased muscle tone leads to rigidity
Harder to do passive ROM
What is flaccidity?
Decreased muscle tone
Easier to do passive ROM
What is a resting tremor?
Tremor at rest
What is an intention tremor?
Tremor during movement/use of muscle
What is a fasciculation?
Spasm of muscle during tired; pulsating
Not related to a disorder
Overuse/tired muscle
What is a seizure?
Abnormal electrical conduction of the brain
When do seizures occur?
Epilepsy High fever Hitting head Swelling of brain Too much alcohol Amphetamines Any brain injury can increase risk (Turn pt on side)
What is a tic?
Brain imbalance
Can be verbal/motor
Ex: tourette’s
How do you test muscle strength?
ROM against resistance
How do you elicit a DTR?
Briskly tap the tendon of a partially stretched muscle
What spinal cord segment is related to the triceps?
Cervical 6, 7
What spinal cord segment is related to the patellar?
Lumbar 2, 3, 4
What spinal cord segment is related to the achilles?
Sacral 1
What spinal cord segment is related to the biceps?
Cervical 5, 6
What spinal cord segment is related to the brachioradialis?
Cervical 5, 6
What movement occurs in bicep DTR?
Elbow flexion
What movement occurs in tricep DTR?
Elbow extension
What movement occurs in patellar DTR?
Extension of leg (usually runs +3)
What movement occurs in achilles DTR?
Plantar flexion
What movement occurs in superficial plantar DTR?
Flexion of toes
How do you look for superficial plantar DTR?
Start on outer portion of foot and scrape up and across toes
What does it mean when the big toe dorsiflexes and other toes fan out?
It’s positive Babinski sign
Normal in babies, not normal in adults