3/26 Neuro Flashcards
fovea: nasal or temporal?
optic disc: nasal or tempora?
fovea: temporal
optic disc: nasal
anopia/anopsia
-define:
defect in field of vision
-so when its describing it, like bilateral temporal hemianopsia, it means the temporal visual field is fucked up on both sides.
optic radiations
-the path from what to what?
LGN => V1 via optic radiations.
optic radiations
-what are the two paths?
1) Meyers loop
2) Dorsal optic radiation
Brain lesion where can damage meyers loop?
-stroke in which art dmgs meyers loop?
- temporal lobe
- MCA
Meyers loop
- inf or sup retina?
- inf or sup visual field?
- mnemonic?
- inferior retina (on that side) which obviously = superior VF.
- (Max) Myers: lower in brain (inf. 1/2 of neurons) but superior in appearance (sup. 1/2 of VF).
What visual process loops around inferior horn of lateral ventricle?
Meyers loop
What visual path runs thru the internal capsule?
Dorsal optic radiation
Lesion where damages the Dorsal optic radiation?
-stroke in which art dmgs dorsal optic radiation?
- Parietal lobe
- MCA.
Dorsal optic radiation
- inf or sup retina?
- where in brain is it located?
- mnemonic
- sup. retina
- parietal lobe
- “parietal lobe is higher up than temporal lobe, DOR is superior 1/2 of retina.”
4 destinations of optic tract fibers?
1) LGN
2) pretectal nucleus
3) superior colliculus
4) suprachiasmatic nucleus (of hypoT)
Sturge-Weber syndrome
- somatic or inherited?
- developmental anomaly of what tissue derivatives?
- ectoderm? mesoderm? endoderm?
- somatic
- neural crest cells.
- ectoderm & mesoderm.
Sturge-Weber syndrome
- what type of mutation?
- which gene?
- activating mutation
- GNAQ gene
Sturge-Weber syndrome
-in basic terms, whats the problem here?
- problem w/blood vessels.
- you get port-wine stain on face & neurological problems from excessive blood vessel growth on brain (angiomas).
Sturge-Weber syndrome
- Sxs:
- mnemonic:
STURGE:
- Sporadic, port-wine Stain
- Tram track Ca2+ (opposing gyri)
- Unilateral
- Retardation
- Glaucoma, GNAQ gene
- Epilepsy.
Tuberous sclerosis
- Sxs:
- mnemonic?
HAMARTOMAS
- Hamartomas in CNS and skin
- Angiofibromas
- Mitral regurgitation
- Ash-leaf spots
- cardiac Rhabdomyoma
- Tuberous sclerosis
- autosomal dOminant
- Mental retardation
- renal Angiomyolipoma
- Seizures, Shagreen patches
Tuberous sclerosis
-inheritance pattern
auto dom.
-must have variable expressivity.
Neurofibromatosis type I (von Recklinghausen disease)
- mutation in what gene?
- whats the gene product?
- which chrom?
- inheritance pattern?
-NF1 tumor suppressor gene
-neurofibromin, a negative regulator of Ras
-chrom 17
-
Neurofibromatosis type I
-Sxs:
Its a PNS tumor syndrome
- Café-au-lait spots
- Lisch nodules (pigmented iris hamartomas)
- neurofibromas in skin
- optic gliomas
- pheochromocytomas.
von Hippel-Lindau disease
- inhertiance pattern?
- which gene?
- which chrom?
- auto dom
- VHL tumor suppressor gene
- chrom 3
von Hippel-Lindau disease
-gene products that are over-expressed?
-constitutive expression of HIF (transcription factor) and
activation of angiogenic growth factors.
von Hippel-Lindau disease
- Cavernous hemangiomas in skin, mucosa, organs
- bilateral renal cell carcinomas
- hemangioblastoma in retina, brain stem, cerebellum
- pheochromocytomas.
do meningiomas stain for GFAP?
no
butterfly glioma =?
glioblastoma multiforme
“Pseudopalisading” pleomorphic tumor cells—border central areas of necrosis and hemorrhage.
-which tumor?
glioblastoma multiforme
meningioma
- typically found where?
- tumor of what cell?
- near the surface of brain & parasagittal.
- arachnoid cell.
Spindle cells concentrically arranged in a whorled pattern; psammoma bodies.
-which tumor?
meningioma
new-onset seizures in adult female
-imaging shows mass attached to the dura
meningioma
Hemangioblastoma
- child or adult?
- cerebral or cerebellar?
- adult
- cerebellar
Cerebellar hemangioblastoma w/retinal angiomas
-what disease?
VHL
Hemangioblastoma
-which paraneoplastic hormone?
EPO
Oligodendroglioma
-most commonly found where?
frontal lobes
Pilocytic astrocytoma
- benign or malignant?
- marker?
- benign.
- GFAP
Rosenthal fibers
- what do they look like?
- what disease are they found in?
- eosinophilic, corkscrew fibers.
- pilocytic astrocytoma
Pilocytic astrocytoma
-gross appearance?
- cystic + solid
- Mural node = small mass of tissue that adheres to the wall of the cyst.
Ependymoma
-most often found in which ventricle?
4th ventricle
Perivascular rosettes & rod-shaped blepharoplasts
-which disease?
ependymoma
Subfalcine herniation
- what is it?
- what can be compressed?
- Cingulate gyrus herniation under falx cerebri.
- ACA can be compressed
Uncal herniation
- what is it?
- what CN be compressed?
- Uncus = medial temporal lobe, herniates thru tentorium cerebelli.
- Compressed CN 3 => CN3 palsy + blown pupil.
Uncal herniation
-what visual defect?
-Compressed ipsilateral PCA => contralateral homonymous hemianopia.
Uncal herniation
-what type of paralysis?
-compressed contralateral crus cerebri => ipsilateral paralysis, “false localization” sign.
First sign of uncal hernation?
fixed & dilated pupil
Cerebellar tonsillar herniation
- herniates into where?
- Sxs:
- causes of death:
- foramen magnum
- Coma and death result when these herniations compress the brain stem (and inhibit respiration).
Brimonidine
- what is it?
- whats it used for?
alpha2-agonist
-glaucoma: dec. humor prod
Epinephrine
- how does it treat glaucoma?
- which glaucoma does it treat?
- dec. aqueous humor synthesis via vasoconstriction.
- do NOT use on closed-angle bc it causes mydriasis!
Emergency closed-angle glaucoma
-Tx:
pilocarpine
loperamide
- what is it?
- common use?
- opiate
- Its an anti-diarrheal.
diphenoxylate
- what is it?
- common use?
- opiate
- Its an anti-diarrheal.
Opiates
-what does pt never develop tolerance to?
miosis & constipation.
naloxone
-route of admin?
IV
Which opiate do you use in biliary & colic pain?
meperidine
meperidine
- how is it metabolized?
- what is its metabolite?
- P450 metabolism.
- Its metabolite (normeperidine) = SSRI
Why should you be careful prescribing an opiate to a pt w/hypotension?
-all mu opioids cause histamine release => vasodilation & itching.
Mu receptors
-what type of receptor?
- Gi coupled
- open K channels = hyperpolarization.
- close Ca channels & prevent release of NTs.
Opiates
-inhibit release of what chemicals?
Inhibit release of ACh, norepinephrine, 5-HT, glutamate, substance P.
Pentazocine =
- partial agonist @ Mu receptor.
- can cause withdrawals to opiate addict.
Meperidine overdose
-can you give naloxone?
No
How do opiates treat acute pulmonary edema?
-Improves pulmonary hemodynamics, helps normalize ventilation, helps allay anxiety.
How do opiates depress your central respiratory center?
-if your respiratory center is depressed, what keeps your ventilation going?
- Your pCO2 centers in your medulla (central respiratory center) have mu receptors, so morphine will shut them down.
- You also have peripheral O2 receptors (carotid body/aortic body) called your “hypoxic drive”. This is what will remain when a pt is under the influence of an opiate b/c central respiratory center is shut down.
Can you give O2 to a pt under opiates?
- Do NOT give O2 to pt under opiates unless pt is mechanically ventilated.
- Lots of oxygen will turn off the pO2 centers (carotid/aortic bodies) so there wont be any signals to breathe.
Butorphanol
- what is it?
- how do you treat OD?
- Mu-opioid receptor partial agonist and kappa-opioid receptor agonist; produces analgesia.
- Overdose not easily reversed with naloxone.
Tramadol
- mech?
- mnemonic?
- Weak opioid agonist; also inhibits serotonin and NE reuptake
- works on multiple neurotransmitters—“tram it all” in with tramadol.
Tramadol
-tox:
- Similar to opioids
- Decreases seizure threshold
- Serotonin syndrome
MI presenting w/brady & hypotension?
- wheres the infarct?
- which artery?
- which leads?
- SA node.
- RCA
- 2, 3, aVF
pseudogout
- deposition of what type of crystals?
- shape?
- are they +/- birefringent?
- calcium pyrophosphate
- rhomboid
- weakly positively birefringent.
gout
- what are crystals made of?
- are crystals +/- birefringent?
- monosodium urate
- neg. birefringent.
Gout
-what color are crystals in parallel light?
yellow
Pseudgout
-what color are crystals in parallel light?
blue
Destructino of oligodendrocytes seen in which diseases?
MS & PML
*which is funny bc natalizumab is used to treat MS but can cause PML.
pleomorphic
-define:
differing in size & shape.
cutaneous facial angiomas & leptomeningeal angiomas
Sturge Weber syndrome
femoral neck fx
-which artery is at risk?
medial circumflex art.
inc or dec levels of hepcidin in hemochromatosis?
-how about ferroportin expression?
decreased levels of hepcidin which will upregulate (basolateral) ferroportin which allows enterocytes to release more iron into circulation.