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Basilar section of brainstem anterior; contains predominantly motor system structures; motor nuclei: substantia nigra, pontine nuclei, & inf olive; pontocerebellar axons; descending axons from cerebral cortex
spinothalamic tract pain & temperature discrimination; pass directly through brainstem w/o synapsing
spinocerebellar tracts unconscious proprioception; leave brainstem via the inf cerebellar peduncle to enter cerebellum
sympathetic tracts don't synapse at all in brainstem
tegmentum posterior bs; reticular formation, sensory nuc & ascending sensory pathways, CN nuc, & MLF;
reticular formation adjusts the gen level of act t/o the nervous system; a complex neural network including the reticular nuclei, their connections, & pathways; integrates sensory & cortical info, regs somatic motor act, autonomics, & consciousness; mods pain info
tectum only in midbrain; involved in intrinsic & extrinsic head movements & eye muscs; pretectal area & sup & inf colliculi; post to tegmentum; most post part of brainstem
superior cerebellar peduncle carries efferent info from cerebellum to the midbrain
oculomotor parsympathetic nucleus Edinger-Westphal nucleus (supplies ps control of the pupillary sphincter & ciliary musc)
Created by: MeganFultz2