bibb320-lecture 5-6

bibb320-lecture 5-6 - Brainstem The Spinal Cord of the Head...

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Brainstem Neuroscience [email protected] Brainstem The Spinal Cord of the Head Or Cranial Nerve Nuclei of Brain And More
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Brainstem Neuroscience [email protected] 2 Three Major Brain Components
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Brainstem Neuroscience [email protected] 3 Brainstem Diencephalon, Midbrain, Pons and Medulla
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Brainstem Neuroscience [email protected] 4 Brainstem Functions Six Categories 1) First, the brainstem is the site of cranial nerve nuclei i. Therefore you can compare and contrast how the brainstem organization of neurons for cranial neurons resembles or differs from the spinal cord organization for spinal nerves. 2) Second , it is the home of the reticular formation (RF) i. The RF is most likely a huge expansion of the intermediate gray zone of the spinal cord gray matter. It's histological appearance is greatly altered being reticulated with a greater variety of neuron sizes and densities than found in the spinal cord. » It plays a role in arousal and sleep through the ascending reticular activating system . » It is the origin of the reticulospinal motor pathways » It contains premotor neuronal groupings for the motor nuclei of the cranial nerves. RF RF Projection nuclei Cranial Nerve nuclei
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Brainstem Neuroscience [email protected] 5 Brainstem Functions (cont.) 3) Third , it is the home of critical neurocircuitry (integratory) maintaining vital signs through autonomic nervous system innervation (involves cranial nerves and spinal cord). Supports control of respiratory and cardiovascular function 4) Fourth(not cranial nerve nucleI) , it is the origin of neurochemically specific projection pathways (monoamines ) which have wide ranging effects on arousal, attention, motivation, locomotion, affect, pain, learning and consciousness . A remarkably powerful modulator of behavior in spite of the fact that it is a small system in terms of neuronal number. 5) Fifth , it is the origin of one set of descending motor tracts which affect locomotion (Somatic) and visceral function (Autonomic). Reticulospinal pathways - origins in RF 6) Sixth , it contains projection nuclei which receive sensory information, process it and project it further up the neuraxis to the cerebellum, upper brainstem or thalamus (mostly somato- or viscerosensory but also vestibular, auditory, visual, and chemosensory).
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Brainstem Neuroscience [email protected] 6 Brainstem as a continuation of Spinal Cord The Medulla Similarities a) Looks like a spinal cord but it is opened up dorsally (4th ventricle). b) Has ascending and descending tracts external to a core of gray matter.
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This note was uploaded on 11/28/2011 for the course BIOLOGY 310 taught by Professor Mueller during the Fall '11 term at Drexel.

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bibb320-lecture 5-6 - Brainstem The Spinal Cord of the Head...

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