II - posterior spinocerebellar subconscious proprioception...

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II. Spinal Cord Structure - Cross Section A. Grey vs. White Matter 1. grey matter 2. white matter B. Regions in the Grey Matter - H shaped center 1. grey commissure - cross bar of the H 2. central canal - hole in the center 3. anterior (ventral) horns 4. posterior (dorsal) horns 5. lateral (intermediate) horns (T, L, S only) C. Regions in the White Matter - fiber tracts 1. anterior (ventral) column 2. posterior (dorsal) column 3. lateral (intermediate) column 4. fasciculi/tracts - axon bundles w/ common function a. ascending tracts - sensory to the brain b. descending tracts - brain->motor neurons III. The Ascending/Descending Tracts of the Cord Tract Function ASCENDING TRACTS (SENSORY) anterior (ventral) spinothalamic touch and pressure to thalamus lateral spinothalamic tract fasciculus gracilis touch, 2-pt. discrimination, fasciculus cuneatus conscious proprioception, stereognosis, weight discrimination, vibration
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Unformatted text preview: posterior spinocerebellar subconscious proprioception anterior spinocerebellar DESCENDING TRACTS (MOTOR) lateral corticospinal motor output from cortex to anterior corticospinal motor cells of ant. horn rubrospinal motor from midbrain to ant. horn for precise movement tectospinal motor from midbrain to ant. horn; movements in response to audiovisual/cutaneous stimuli vestibulospinal motor from medulla to ant. horn; coordination/balance lateral reticulospinal motor from medulla to ant. horn; inhibit ext. reflexes medial reticulospinal motor from pons to ant. horn; facilitate ext. reflexes * NOTE: These descending tracts terminate on the motor cells of the ANTERIOR GREY HORN. It is here that the cell bodies of the motor neurons to the skeletal muscles reside. The efferent skeletal motor fibers (axons) originate in the ANTERIOR HORN !!!!!!!!!! These motor fibers get to the muscles via the 31 pairs of spinal nerves. This is how all motion is controlled....
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II - posterior spinocerebellar subconscious proprioception...

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