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13 Cards in this Set
- Front
- Back
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lesion of the suprachiasmatic n. of the hypothalamus would result in
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suprachiasmatic regulates circadian rhythms, leson=insomnia, can tx with melatonin (hint: the sun rises from the chasm)
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lesion of the anterior hypothalamic n. would result in
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hyperthermia (the anterior senses heat and activates cooling, High Power Air Conditioner)
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lesion of the posterior n. of the hypothalamus woudl result in
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poikilothermia (Posterior senses cold and warms, anterior senses heat and cools, both n. and ant fibers are destroyed, High Power Air Conditioner)
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lesion of the lateral hypothalamus will result in
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weight loss (No lat, no fat) (the lateral area stimulates apetite)
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lesion of the (ventro)medial hypothalamus results in
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weight gain (the ventromedian area inhibits appetite) and pain, rage, averse reactions, hyperemotionality
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Describe the normal PNS and SNS control of the bladder
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PNS-constricts the bladder walls, SNS-constricts the sphincter
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What role do the SNS and PNS play in urinary continence and urination
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Contience-Inhbit the PNS to stop bladder wall constriction, Stimulate the SNS to constrict the sphincter, Urination-Stimulate the PNS to constrict the bladder wall, inhibit the SNS to relax the sphincter (hint: you have to be relaxed to pee-simulate PNS, inhibit SNS)
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treatment with anti-cholinergics can be used to tx incontinence caused by
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hyperactive bladder or underactive sphincter, inhibiting the PNS will decrase bladder wall contraction
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treatment with anti-adrenergics can be used to tx incontinence caused by
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overactive sphincter or hypoactive bladder, inhibiting the SNS will relax the sphincter
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what is the action of the SNS and PNS on the pupils
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SNS-dilate, PNS-constrict
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to distingush between a PNS lesion or a contralateral SNS lesion, how must you test the eyes
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test in both light and darkness, make sure to watch for ptosis as well (oculosympathetic ptosis due to lesion of the superior tarsal m., note that this is not a lesion of CN III, indicative of Horner's syndrome)
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describe the sympathetic pathways that allows for dilation of the pupil
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Light hits retina and sends signal down CNII to the pregeniculate body and then the midbrain and thoracic spinal cord via the tectospinal tract. Then preganglionic fibers travel up the sympathetic chain to the superiror cervical ganglion. Postganglionic fibers then travel to the dilator m. and the superior tarsal m.
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Internal carotid artery dissection can cause partial Horner's syndrome. Why is there normal sweating of the forehead
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Sympathetics to the forehead run along the external carotid artery, dissection of the internal knocks out sympathetics to the eye only
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