Chapter 13 (6)
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Chapter 13 (6)
Lecture test number one.
What are the components of the diencephalon?
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)
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
What are the components of the Thalamus?
: 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.
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.
Describe the components of the Hypothalamus.
: Connects to pituitary gland
: Control feeding reflexes like licking and swallowing, Relay station for olfaction
: Secrete chemical messengers that control endocrine cells in anterior pituitary, Secrete two hormones released by posterior pituitary
: autonomic centers that control cardiovascular and vasomotor centers of medulla oblongata
: Regulates body temperature through adjustments in blood flow and sweat gland activity
: Coordinates day-night cycles of activity/inactivity