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28 terms

Neuro Midterm Lecture 1

STUDY
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Cerebrum=
• Diencephalon + Telencephalon
4 Major Parts of the Diencephalon:
• Epithalamus
• Thalamus
• Hypothalamus
• Subthalamus
Pineal Body:
• Attached to roof of 3rd ventricle
• Secretes substances into CSF
• Circadian Rhythms
Habenular Nuclei:
• Input from Stria Medullaris
• Projects to Raphe nucleus in brainstem
Stria Medullaris:
• Septal Nuclei to habenula
Hypothalamus:
• Integrates ANS with Endocrine glands
• Includes mammillary bodies
Subthalamus:
• Internal capsule
• Subthalamic nucleus
• Reticular nucleus
• MGN
• LGN
Epithalamus Function:
• Linked with Limbic System
• Autonomic/behavioral responses to emotional changes
Thalamus Function:
• Sensory/motor relay to cortex
Hypothalamus Function:
• Major role in emotion
• Basic functions (hunger, thirst, homeostasis)
Subthalamus Function:
• Motor Function
Corpus Striatum=
• Caudate + Putamen +Globus Pallidus
Lentiform Nucleus=
• Putamen + Globus Pallidus
Basal Ganglia:
• Corpus Striatum
• Subthalamic Nucleus
• Substantia Nigra
• Amygdala
• VOLUNTARY MOVEMENTS
Hypokinetic Disorders:
• Dysfunction of the basal ganglia
• Akinesia
• Bradykinesia
Hyperkinetic Disorders:
• Dyskinesia
Thalamocortical Fibers (corticopetal):
• Ascending Fibers from thalamus
Corticofugal Fibers:
• Descending fibers from cortex (corticospinals & Corticonuclears)
3 Major Parts of the IC (Internal Capsule):
• Anterior Limb
• Genu
• Posterior Limb
2 Parts of the Anterior Limb:
• Descending Corticofugal Fibers
• Anterior Thalamic Radiation (ascending/descending fibers connecting Anterior & medial thalamus with prefrontal cortex)
Genu:
• Contains Corticonuclear fibers
3 Parts of the Posterior Limb:
• Corticopontine/Corticospinal fibers
• Retrolenticular Fibers
• Sublenticular Fibers
Retrolenticular Fibers:
• Form the Optic Radiation which connects the LGN with the visual cortex
Sublenticular fibers:
• Form the Auditory Radiation which connects the MGN with the auditory cortex
Lateral Striae Branches of MCA Supplies:
• Anterior limb of IC
• Posterior limb of IC
Internal Carotid Artery Supplies:
• Genu
Anterior Choroidal Artery Supplies:
• Retrolenticular Part of Posterior Limb
IC Infarction:
• Contralateral Effects
• Sensory & Motor deficits
• Damage to Posterior Limb:
• UMN signs, (hemiplegia/hemiparesis)
• Visual Field Deficits
• Auditory Deficits