Brain Impractical Uno Compiled by MF Dauzvardis Gross Brain Structures.
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Transcript of Brain Impractical Uno Compiled by MF Dauzvardis Gross Brain Structures.
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Brain Impractical Uno
Compiled by MF Dauzvardis
Gross Brain Structures
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CerebellumCovers the fourth ventricle, responsible for the initiation and planning of movement, cerebellar signs are ipsilateral, midline lobe is called vermis, highly crenated cortex is called “arbor vitae”, key cells = pyramidal, granular, and molecular
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PinealSecretes melatonin, seat of the soul, biological clock?, third eye in some fishes and amphibians.
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MedullaJust rostral to cervical cord, contains critical breathing centers, fed by vertebral and pica arteries (lateral wallenberg syndrome when pica is blocked)
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Pons“bridge” Covered largely by the 4th ventricle and the cerebellum. Fed in part by the basilar artery, Many cortical pontine fibers end in the pontine gray nuclei which in turn project to the cerebellum via the MCP
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MidbrainKey features: cerebral peduncles, aqueduct of Sylvius, substantia nigra, tectum (inferior and superior colliculi) red nucleus, CN III, IV
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Fourth ventricleContains csf, choroid plexuses, foramen luscka(lateral) and magendie(medial) lead to cisterna magna and subarachnoid space. CSF leaves midbrain via aqueduct of Silvius
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Aqueduct of SilviusConnects 4th ventricle to 3rd ventricle, obstruction can lead to hydrocephaly, surrounded by periaqueductal gray (PAG)—related to pain
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3rd ventricleFilled with CSF, sits between thalami and enters hypothalamus, connects to lateral ventricles via foremen of monroe, contains some choroid and also the stria medullaris thalami which connect habenula to septal nuclei
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TectumConsists of superior and inferior colliculi, don’t forget SLO-AIM
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MedullaJust rostral to cervical cord, contains critical breathing centers, fed by vertebral and pica arteries (lateral wallenberg syndrome when pica is blocked)
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Pons“bridge” Covered largely by the 4th ventricle and the cerebellum. Fed in part by the basilar artery, Many cortical pontine fibers end in the pontine gray nuclei which in turn project to the cerebellum via the MCP
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MidbrainKey features: cerebral peduncles, aqueduct of Sylvius, substantia nigra, tectum (inferior and superior colliculi) red nucleus, CN III, IV
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CerebellumCovers the fourth ventricle, responsible for the initiation and planning of movement, cerebellar sighs are ipsilateral, midline lobe is called vermis, highly lobulated cortex is called “arbor vitae”, key cells = pyramidal, granular, and molecular
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4th ventricleContains csf, choroid plexuses, foramen luska(lateral) and magendi(medial) lead to cisterna magna and subarachnoid space. CSF leaves midbrain via aqueduct of Silvius
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AqueductConnects 4th ventricle to 3rd ventricle, obstruction can lead to hydrocephaly, surrounded by periaqueductal gray (PAG)—related to pain
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3rd ventricleFilled with CSF, sits between thalami and enters hypothalamus, connects to lateral ventricles via foremen of monroe, contains some choroid and also the stria medullaris thalami which connect habenula to septal nuclei
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TectumConsists of superior and inferior colliculi, don’t forget SLO-AIM
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Medulla
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Pons
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Midbrain, interpeducular fossa
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Cerebellum
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Temporal lobe
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mammillary bodies
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optic chiasm
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Pia mater
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I
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II
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III
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IV
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V
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VI
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VII
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VIII
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IX, X, XI
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Location of XII, between pyramid and olive
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Blood vessels, MCA
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Flocculus
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Cerebellum (vermis)
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Floor of 4th ventricle
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Cerebellar peduclesSuperior (brachium conjunctivum), Middle (brachium pontis), Inferior (restiform body)
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Superior and inferior colliculiSlo-aim--------superior colliculi, lat geniculate, optic stuff-------auditory stuff, inf colliculus,med geniculate,
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Pineal
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ThalamiMajor relay station for sensory information
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Lateral geniculate for visual relay
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Area of medial geniculate, relay for audition
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Area of vestibular nuclei—remember inferior vestibular nucleus is “peppered”
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Pulvinar nucleus of thalamus
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Obex—opening of central canal into 4th ventricle
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Cerebral peduncle—connects cerebrum to brainstem—mainly descending motor fibers. Rostrally it turns into the internal capsule
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Brachium(arm) of the superior colliculus
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Brachium of the inferior colliculus
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3rd ventricle
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Genu of corpus collosum
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Anterior limb of internal capsule
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Genu of internal capsule
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Posterior limb of internal capsule
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Splenium of corpus collosum
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Visual cortex
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Head of caudate
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Putamen
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Globus pallidus
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Insula
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Thalamus
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Columns of fornix—hippocampus to mammilary bodies