Chapter 13 (6)

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  1. What are the components of the diencephalon?
    • Thalamus
    • Epithalamus
    • Hypothalamus
  2. Describe the epithalamus.
    • Roof of diencephalon, superior to third ventricle
    • Anterior portion - Contains extensive area of choroid plexus that extends into interventricular foramina
    • Posterior portion - Pineal gland: Secretes melatonin (hormone regulating day-night cycles and some reproductive functions)
  3. Describe the Thalamus.
    • On each side of brain, superior to midbrain.
    • Final point for ascending sensory information to be relayed or projected to cerebral cortex. Acts as a filter, only passing on small portion of sensory information.
    • Has regions that contain nuclei or groups of nuclei that connect to specific regions of cerebral cortex
  4. What are the components of the Thalamus?
    • Interthalamic adhesion: Connects thalamic hemispheres, but no neural fibers cross.
    • Lateral geniculate nucleus: Receives visual information from optic tract and relays signals to midbrain and occipital lobe.
    • Medial geniculate nucleus: Relays auditory information from inner ear receptors to appropriate cerebral cortex area.
  5. Describe the Hypothalamus.
    • Contains important control and integrative centers
    • Centers may be stimulated by:
    • -Sensory information from cerebrum, brain stem, and spinal cord.
    • -Changes in CSF and interstitial fluid composition.
    • -Chemical stimuli from blood because this area lacks blood–brain barrier.
  6. Describe the components of the Hypothalamus.
    • Infundibulum: Connects to pituitary gland
    • Mammillary bodies: Control feeding reflexes like licking and swallowing, Relay station for olfaction
    • Hormonal centers: Secrete chemical messengers that control endocrine cells in anterior pituitary, Secrete two hormones released by posterior pituitary
    • Nuclei: autonomic centers that control cardiovascular and vasomotor centers of medulla oblongata
    • Preoptic area: Regulates body temperature through adjustments in blood flow and sweat gland activity
    • Suprachiasmatic nucleus: Coordinates day-night cycles of activity/inactivity
    • Hormonal centers
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Chapter 13 (6)
2012-02-08 02:37:07

Lecture test number one.
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