ANATOMY 1 Lecture Notes - Lecture 28: Somatic Nervous System, Motor Cortex, Endocrine Gland
Document Summary
= region of brain stem where white matter and gray matter exhibit netlike arrangement. Small clusters of neuronal cell bodies (gray matter) interspersed w/ small bundles of myelinated axons (white matter) Extends from superior spinal cord brain stem inferior diencephalon. Visual + auditory stimuli, mental activities, pain, touch, pressure, etc. => why victims of fires are not aroused from sleep by smell of fire. Visual + auditory stimuli + mental activities stimulate ras tain to help maintain consciousness. Prevents sensory overload filters out insignificant info before it reaches consciousness inactivation of ras => sleep. Descending ras tracts of white matter in cerebellum. Helps w/ regulation of heart rate, blood pressure, respiratory rate. Folded surface increase sa of grey matter => greater number of neurons. Contains of the neurons of the brain. Regions of gray matter in white matter axons carrying impulses from cerebellum to other brain centers + spinal cord. Gray matter folia of the arbor vitae.
