Medulla by DR.ARSHAD
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Transcript of Medulla by DR.ARSHAD
BRAIN STEM- MEDULLA
Brainstem
• Performs spinal cord-like functions for the head
• Contains LMN for head muscles• Initial processing of general afferent
information concerning head
Conduit function
• Ascending tracts reach thalamus and cerebellum
• Descending tracts reach spinal cord• Many tracts do not run through straight-
frequent involvement of relay nuclei
Cranial nerve functions
• Cranial nerves are head’s equivalent of spinal nerves
• Involved in olfaction, sight, hearing, equilibrium and taste
• Olfactory → telencephalon• Optic → diencephalon
• The rest project to or emerge from brainstem• Collection of sensory and motor nuclei related
to cranial nerve function at various levels in brainstem
Integrative function
• Complex motor patterns• Regulation of cardiovascular and respiratory
activity• Some regulation of consciousness [function of
reticular formation in central core of brainstem]
Level of pyramidal decussation
Level of sensory decussation
Components of inferior cerebellar peduncle