Neuro Phys Flashcards
Gag reflex
Ipsilateral glossopharyngeal (afferent) -> bilateral vagus (efferent)
Spinothalamic tract
Carries?
1st order neuron?
pain and temperature sensation
peripheral nerves to posterior horn , cell body in DRG
Dorsal column medial lemniscus
Carries?
1st order neuron?
pressure, touch vibration, proprioception
peripheral nerves to medulla via dorsal column, cell body in DRG
lateral corticospinal
Carries?
1st order neuron?
voluntary movement
Pyramidal neurons in the cortex descent, cross in medullary pyramids,
Synapse on the anterior motor horn of the cord (UMN)
hypothalamospinal
carries?
1st order neuron?
sympathetic input to the face
Arrises from hypothalamus and synapses on lateral horn at T1
2nd order spinothalmic tract
arises from posterior horn, IMMEDIATELY CROSS, in anterior white commissure and ascend in spinothalmic tract to thalamus
3rd order - thalamus to cortex
2nd order dorsal column medial lemniscus
arises from the medulla, crosses LATE and ascends via the medial lemniscus to thalamus
3rd order - thalamus to cortes
2nd order corticospinal
Arises from the anterior motor horn and synapses on muscle (LMN)
2nd order hypothalamospinal
arises from the lateral horn at T1 and synapses on the superior cervical ganglion (sympathetic)
3rd order - superior cervical ganglion to eyelids, pupil and skin of face
Microglial origin
mesoderm - like macrophages
Neural crest cells -> what neural structures?
PNS (CN, DRG, celiac ganglia, ANS) and Schwann Cells
there are other ones….
Neuroectoderm leads -.
CNS neurons, epndymal cells, oligodendrocytes, astrocytes
Blood brain barrier made of
foot process of astrocytes
BM
non fenestrated endothelia
No BBB where hypothalamus releases ADH or measures osmolarity
Histiologic feature defining neurons
Nissl cebstances in the dendrocytes
HIV infected multinucleate giant cells formed by
microglia
Reactive gliosis preformed by
astrocytes
~fibroblasts in the brain
-ID’ed by GFAP
Cell destroyed in MS
Oligodendrocyte
Cell destroyed in Gulliene Barrie
Schwann Cell
Fried Egg apperance on Hand E (3)
Oligodendrocyte
koliocyte w/ HPV
seminoma
Acustic nurima is
type of schannoma -. internal acoustic meatus of CNVIII
Pathways associated w/ Schizophrenia +/-
mesocortical pathway
mesolimbic pathway
Dopamine
Pathway implicated Parkinsons
Nigrostriatal path (substantial nigra-> neostriatum)
Dopamine
Tuberoinfundibular Pathway
Dopamine path from arcuate nucleus in hypothalamus -> Pituitary leading regulation of prolactin levels
What passes the BBB (4)
Lipophilic substance
- small non polar
Glucose and AA w/ carrier transport
Nucleus accumbens
uses what Vitamin and AA
Creates GABA
-LOW in huntintons
Using glutamate and Vit B6
Locus ceruleus creates?
NE
- high in anxiety
- low in depression
Also reticular formation and solitary tract
Ventral tegmentum of midbrain creates?
Dopamine
Also SNc
Decreased dopamine in parkinsons and depression
Raphe nucleus in the pons makes?
5HT
Basal nucleus of meynert makes?
ACh
increased in REM sleep and parkinsons
Glycine?
inhibitory NT of the Spinal Cord
Glutamate?
excitatory NT of CNS
Arcuate nucleus
Hypothalamus
releases dopamine and GnRh
Lateral nucleus
hypothalamus
Hunger
-inhibited by leptin
Destruction -> anorexia
Ventromedial nucleus
hypothalamus
Satiety
-stimulated by leptin
Destruction -> hyperphagia - >excessive eating
Anterior hypothalamus(2) hypothalamus
Cooling (A/C)
parasympathetic stim
Posterior hypothalamus(2) hypothalamus
Heating
sympathetic stim
Dorsal medial nucleus
hypothalamus
Stimulates the GI
works w/ VMN
Suprachiasmatic nucleus
hypothalamus
master clock
circadium rhythm
Preoptic nucleus
hypothalamus
Secreted GnRH -> FSH and LH
Supraotic nucleus
hypothalamus
ADH release
Paraventricular nucleus
hypothalamus
Oxytocin
- give synthetic ptocin for Uterine contraction and clamping down the uterus after birth to control bleeding
Mammary body
in hypothalamus
contains hemorhagicc lesion of Wernicke encephalopathy
Melatonin
secreted by pineal gland during period of darkness
also follows circadian rhythm
Limbic system and at the 5 Fs
Feeding Fleeing fighting Fucking Feeling
Anxiety is due to these changes in NTs (3)
increased NE
decreased 5Ht
decreased GABA
Stages of Sleep and EEG (6)
awake-beta relaxing- alpha NI- Theta NII - Sleep spindle and K complexes NIII- Delta REM - Beta
Night terrors and bed wetting found in
NIII
Rx w/ benzos or imiprimine
Bruxism is what and where is it found
Teeth grinding in stage II sleep
Sleep enuresis can be treated w/
imiprimine (TCA)
Desmopressin - ADH
paramedian pontine reticular formation is important in sleep when?
rapid eye movement in REM
Depressed sleep changes (4)
decreased REM latency and increased REM early in sleep cycle
repeated nighttime awakenings and early morning awakening
low slow sleep
Narcolepsy characterized by what sleep cycle
Rx:
Awake -> REM
- Cateplexy and Hallucinations
Tx w/ modafinil
-nightime sodium oxybate
Insomina Rx
1st line
Benzo alternative Rx? (3)
antihistamines
Zolpidem
Zaleplon
eszopiclone - long term
Tounge nerves Anterior 2/3 taste? Anterior 2/3 sensation Posterior taste? posterior sensation
Facial nerve
trigeminal - mandibular branch
glossopharyngeal
glossopharyngeal
Vagus is taste in epiglotic
Olfactory nerve exits
cribiform plate
Lesions of the olfactory nerve (2)
cribiform plate frature
Kallman syndrom e9infertile as well)
Exits the superior orbital fissure (4)
Occulomotor
Trochlear
trigeminal opthalmic branch
abducens
Trigeminal maxillary branch exits
foramen rotundum
Trigeminal mandibular branch exits
foramen ovale
2 nerves exiting internal acoustic meatus
facial
vestibularcochlear nerve
3 nerves exiting the jugular foramen
glossopharyngeal
vagus
spinal accessory nerve
Hypoglosseal nerve exits the
hypoglosseal canal
Cranial nuclei of midbrain
3 occulomotor
4 trochlear
Cranial nuclei of the pons
5 trigeminal
6 abducens
7 facial
8 vestibularchochlear
Cranial nuclei of the medulla
9 Glossopharyngeal
10 Vagus
12 hypoglosseal
Cranial nuclei of spinal cord
11 accessory
Muscles of mastication
- open
- close
- nerve
open - lateral petrygoid
close - temporal is, masseter, medial pterygoid
V3 - mandibular branch of trigeninal
5 branches of facial nerve
To Zanzibar By Motor Car
Temporal Zygomatic Buccal Marginal mandibular Cervical
Parotid gland innervation
glossopharyngeal
Submandibular and sublingual innervation
facial nerve
Lesions of the hypoglosseal see?
tounge pointing toward the lesion
lessons of vagus nerve see?
Uvula points away from lesion
Pupillary reflex
II shine in light
III constricts
Corneal reflex
V1 senses touch
VII temporal branch shuts
CNIII damage
Down and out pupil
CN IV damage
eyes gazes upward, hard with stairs
CN VI damage
medially directed eye
Nucleus Solitaris(3)
Vagus nuclei- Visceral sensory
taste
baroreceptors
gut distension
Nucleus ambiguous (3)
Vagus nuclei -Motor
pharynx
larynx
upper esophagus (swallowing, plate elevation)
Dorsal motor nucleus
Parasympathetic control of vagus
heart
lungs
Upper Gi
Infection of cavernous sinus leads to what neuro defects
Ophthalmoplegia (CN 3, 4 ,6)
Upper and middle face sensation change (V1 and 2)
Marcus gunn pupil
afferent pupillary defect - damage or retina detachment ->
Bilateral constriction when light is shown in unaffected eye
Neither constrict in affected
Bitemporal hemanopia
optic tract lesion
Left homonymous hemianopia
R optic tract lesion
Right anopia
Right optic nerve lesion
central scotomata - loss of central vision
macular degeneration
Left hemanopia w/ macular sparing
Posterior cerebral artery infarct- collateral from middle cerebral spares the macula
Increased AFP seen in maternal serum and amniotic (3)
Down in ?
anterior abdominal wall defect
Spina bifida
Anencephaly
Down in Down syndrome
Anencephaly
Clues(2)?
malformation of anterior neural tube-> no forebrain, low folate of DM type 1 risk
polyhydramnios - no swallowing reflex
Increase AFP
Holoprosencephaly is ?
Due to
failure of L and R hemispheres to separate
sonic hedgehog signaling mutation
Proencephalon/Forebrain -> (2)
embryology
telencephalon -> cerebral hemispheres
Diencephalon -> thalamus
Mesenecephalon/Midbrain ->
embryology
mesencephalon -> midbrain
rhombencephalon/hindbrain -> (2)
metencephalon (Pons and cerebellum)
Myelencephalon (medulla)
Chiari One is at risk for?
Characterized by
syringomelia
- can be connected to trauma as well
mild cerebellar tonsils herniate
Chiari type II is what ?
Leads to (3)
Significant cerebellar tonsillar/vermian herniation through foramen magnum
aquaductal stenosis,
hydrocephalus,
thoraco-lumbar myelomeningocele
cystic enlargement of the 4th ventricle w/ enlarged posterior fossa
- Agenesis of cerebellar vermis is called
Dandy walker
C8-T1 lesion w/ loss of pain and temp sensation is at further risk for what neuro defects?
What tract is affected 1st
Syringomyelia
can have additional weakness of arms w/ progressive anterior horn involvement
spinothalamic tract
Brachial cleft derived from
ectoderm
Brachial pouches derived from
Endoderm
Brachial arches derived from
mesoderm
Branchial cleft cyst characterized by
Other major cleft derivative?
lateral neck location that does not move w/ swallowing
-vs thyoglossal cyst(midline and moves)
Cleft 1 -> external auditory meatus
1st brachial arch derivatives think
Muscles(3)
Nerves(2)
Ms and Ts
Muscles of mastication(Temporalis, Maseter, lateral and medial pterygoid)
Mylohyloid
Tensor Tympani
Tensor veli palatini
Mandibular and Maxilliary branch of trigeminal
2nd brachial arch derivatives think
Muscles(4)
Nerve(1)
S’s
Facial expression (CN Seven)
Stapedius
Stylohyoid
posterior belly of digastric
CN VII
3rd brachial arch derivatives think
Muscle (1)
Nerve (1)
pharyngeal
Stylopharyngeous
glossopharyngeal
4-6th brachial arch derivative think
Muscle(2)
Nerve (1 w/ 2 branches)
thyroid and cricoid
4th
swallowing muscles - cricothyroid, levator palatine and pharyngeal constrictors
–enervated by superior laryngeal branch
6th
Larynx/voice box (EXCEPT cricothyroid)
–enervated by recurrent laryngeal branch
Inferior parathyroids and thymus come from
3rd brachial pouch
superior parathyroids come from
4th brachial pouch
middle ear cavity comes from
1st brachial pouch
palatine tonsils develop from
2nd brachial pouch
monitors carotid body and sinus chemoreceptors
CN 9 - glossopharyngeal
Unilateral lower extremity sensory and or motor loss
contra-lateral lesion of the anterior cerebral artery
Unilateral facial and arm sensory and/or motor loss
contra-lateral lesion of middle cerebral artery
vision defects
poterior cerebral artery
hypersexulaty, hyperorality and disinhibited behavior found in
Kluver Bucy syndrome
Bilateral amygdala lesion
Disinhibited behavior and problems with judgement and concentration
Lesion in the frontal lobe
Views/pays attention to only half the world -
contrallateral lesion of the parietal lobe (non dominant)
- usually the R ignoring the L
hemineglect syndrome
Agraphia, acalcula, finger agnosia and can’t from R from L -> lesion in
Dominant parietal lobe. usually the Left in a Right handed person
Gestman syndrome
Lesion in the reticular activating system leads to
decreased levels of arousal
in the midbrain
Common lesion of the mammalary bodies due to
Thiamin - B1 deficiency - seen in alcoholics
Wenicke Korsakoff syndrome characterized by(5)
confusion opthalmoplegia ataxia memory loss confabulation personality changes
Basal ganglia lesions you may see
tremor at rest
chorea
athetosis
Anything coordinating voluntary movement from the cortex
Intention tremor and limb ataxia seen in
may fall towards the lesion
cerebellar hemisphere lesion
truncal ataxia and dysarthia (muscles of the mouth)
Cerebellar vermis lesion
involuntary flailing of the limbs (contralateral hemiballismus ) seen in
lesion subthalamic nucleus
Inability to make new memories (anterograde amnesia causing lesion )
hippocampus
Lesion of paramaedian pontine reticular formation see
eyes looking away from the lesion
paralysis of upward gaze
Parinauds syndrome
superior colliculi lesion
Lesion of ? leads to inability to repeat phrases
arcuate fasciulus
Wernickes
Fluent aphasia
- speaks but does not comprehend or make sense
word salad
superior temporal gyrus of temporal lobe
Brocas
location?
nonfluent aphasia
-can’t speak but comprehends, very frustrating
inferior frontal gyrus of frontal lobe
Nondominate Brocas lesion?
inability to express emotion (robot talk)
-probably a lesion on the R
Nondominate Wernickies lesion ?
inability to comprehend emotion (spock)
- probably a lesion on the R
Issue associated w/ inhaled anesthetics
hepatotoxicity
especially halothane
Blood solubility and lipid solubility effects on anesthetics
Lipid solubility will determine how quickly it gets into the BBB and also the potency
Blood solubility is the time to effect. Low blood solubility means quicker reaction to effect
ex nitrous oxide is rapid in its effect (low blod solubility) but not very potent- not very lipid soluble
Halothane takes longer to have effect ( more blood soluble) but not more lipid soluble and thus more potent
Inhaled anesthetics
4
Halothan
enflurane
sevoflurane
nitrous oxide
Used for induction and maintenance of general anesthesia (won’t remember)
IV anesthetics types and MOA
4
Also some sedation seen as well
barbituates - acts on GABA receptor increasing the duration of Cl channels being open (thiopental or phenobarbital)
benzodiazepines- acts on GABA receptor increasing the frequency of Cl channels being open ( Diazapam and lorazepam)
ketamine - dissociative anesthetic- blocking NMDA receptors
Propofol - uses for sedation potentiating GABAa, rapid induction (Michael Jackson)
Analgesics used in surgery (2)
Why might you choose one over the other?
Opioids
Morphine -local histamine release side effect
Fentanyl - more potent
Others Butorphanol dextromethorphan tramadol loeramide and diphoxylate
Blood flow concerns during brain surgery which IV anesthetic do you use
Barbituates have decreased blood flow in the brain
NOTE: ketamine causes increased cerebral blood flow
Rx for barbituate overdose?
Rx for benzodiazapine overdose
none - supportive
flumazenil
High risk of tryglcerides levels w/ continued use of this IV anesthetic
propofol
Used for rapid sedation in the ICU and short procedures
Barbituate examples (4)
Thiopental
phenobarbital -> induces liver enzymes (Crigler Najarr Syndrome type II Rx?)
phentobarbiol
secobarbitol
Most common drug used in conscious sedation
midazolam
Benzodiazabine examples (6)
diazapam
lorazapam
alprazolam
midazolam
tamazapm
chlordiazepoxide
Uses of Benzodiazapones (7)
conscious sedation
anesthesia
alcohol withdrawal anxiety seizures night terrors insomnia
2 types of local anesthetics
- both act how?
examples of each (3 each)
esters - procaine, cocaine, tetracaine
amides - lidocaine, mepivacaine, bupivacaine (2 Is)
all act by blocking Na channels on the inner portion of the channel, prefers active channels
does not work as well in acidic environments, like an infection, may need to use more
Given w/ local anesthetics to potentiate result
vasoconstrictors like epinephrine
3 things needs for general anesthesia
anesthetic
analgesic
immobilization - muscle paralysis
MAC - in anesthesia
minimal alveolar concentration which 50% of pop anesthetized -
increased potency = 1/MAC
highly lipid drugs
2 types to create neuromuscular blockade and examples of each
Depolarizing - Succinycholine
Nondepolarizing - -curarine; -curium; -curonium
tubocurarine,
atracurium, mivacurium,
pancuronium, vecuronium, rocuronium
Succinylcholine MOA
risk?
strong ACH receptor agonist -> fasiculations and eventual paralysis with depolarization
-depolarizing
vc. non depolarizing which is a competitive antagonist
Worry of malignant hypertension
Malignant hypertension seen in (2)
Gene?
Rx
succinylcholine use and neuroleptic malignant syndrome
Ryr1 mutation - rytanidine receptor
Rx Dantrolene - blocks Ca release from sarcoplasmic reticulum
Non-depolarizing neuromuscular blocking drugs MOA and examples
Rx?
Competitive antagonists for ACh at the neuromuscular junction
Tubocurarine, atracurium, mivacurium, pancuronium, rocuronium,
Rx w/ neostigmine (cholinestrase inhibitor) - less degradation -> more Ach to overcome
2 Types of depolarizing neuromuscular blocking and Rx
Phase I - prolonged depolarization
- normal dose of succinylcholine
- NO antidote, wait 10 min
Phase II - depolarized but blocked
- overdose of succinylcholine
- antidote w/ cholinesterase inhibitors like in non depolarizing blockade (20-30 min)
seizure affecting only 1 area of the brain
Usually what lobe?
partial or focal
the temporal
either
simple - consciousness intact
complex - LOC
What is the difference between a simple and complex siezure
both are partial seizures usually affecting the temporal lobe
Simple - consciousness intact
complex - LOC
Status epileptics is defined by
Rx?
continuous seizure greater then 5 min or recurrent seizure w/o regaining conscious ness for >30 min
Benzodiazapin 1st line - diazepam or lorazepam
5 types of diffuse seizures and differences
Absence - blank star
myoclonic - quick repetitive jerk
tonic - stiffening
tonic clonic- gran maul - alters between stiff and moving
atonic- drop seizure (appears to be fainting)
Top 3 causes of seizures in kids
congenital, developmental and infection (febrile)
trauma and metabolic
Top 3 causes of seizures in adults
tumors, trauma and stroke
maybe infection
Top 3 causes of seizures in elderly
stroke, tumor and trauma
Maybe metabolic and infection
Rx for trigeminal neuralgia (1 + 3 others)
usually affects which branch
Carbamazepine
phenytoin, gabapentin, topiramate
- maxillary - > touch leads to EXTREME pain
See port-wine stains (nevus flames) over the eye (V1 distribution called?
Causes (3)
Sturge Weber syndrome - congenital disease
- worry of ipsilateral leptomeningeal anginoma under the eye
Causes Seizures, glaucoma, and mental retardation
Presentation of
Seizures, adenoma sebaceous (cutaneous angiofibromas),mental retardation
due to an autosomal Dom disease?
Which gene?
Associated symptoms (2)
Tumors (3)
Tuberous Sclerosis
- complete penetrance w/ variable expression
(TSC1 or 2 gene; hamartin or tuberin protein)
Ash leaf spots(hypomelaocytic macuoles), , harmatomas in CNS(retina) and skin (cortical tubers),
Tumors:
renal angiomyolipoma,
astrocytomas,
cardiac rhabdomyoma
5 Seizure drugs blocking Na Channels
Phenytoin Carbamazapine Lomotrigone topiramate valproic acid
7 seizure drugs that increase GABA activity
gabapentin phenobarbital valproic acid benzodiazapine tigabine vigabatrin levetiracetum
3 seizure drugs that block T type Ca channels
gabapentin
ethosuximde
phenytoin - at high doses
Rx of choice for absence seizures?
Ethosuximide -> valproic acid
Rx for status epilepticus
benzodiazapine - lorazepam and diazepam
Rx for eclampsia
Magnesium sulfate
maybe a benzo
7 odd Side effects of phenytoin
gingerval hyperplasia hirsutism fetal hydrantoin syndrome (cleft lip/palat; mental retardation, congenital heart) megaloblastic anemia - low folate peripheral neuropathy drug induced lupus Steven johnson syndrome
Anti epileptics that are teratogens
phenytoin
carbamazapine
valproic acid - spina bifida worries
Hepatotoxic epileptics(2)
valproic acid
carbamazapine
Treatment for tonic clonic seizures (3)
Valproic acid
phenytoin
carbamazapine
3 receptors and endogenist agonists to opiod receptors
mu - beta endorphin
delta - enkephalin
kappa -dynorphin
aneurysm causes the eye to look down and out
posterior communicating artery
aneurysm leading to loss of peripheral vision bilaterally
anterior communicating artery