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Transcript
Rexed’s Lamina •Some important nuclei •Substantia gelatinosa (II) •Nucleus proprius (IV) •Dorsal nucleus of Clark •Intermediolateral cell column •Motor neuron pools SUMMARY: PATHWAYS IN THE SPINAL CORD Ascending (afferent) pathways (sensation) Descending (efferent) pathways (motor commands) * * Spinal Tracts Dorsal Column Ascending Pathway Deep touch, visceral pain, vibration, and proprioception Fasciculus gracilis and cuneatus carry signals from arm and leg Decussation of 2nd order neuron in medulla 3rd order neuron in thalamus carries signal to cerebral cortex Spinothalamic Pathway Pain, pressure, temperature, touch, Decussation of the second order neuron occurs in spinal cord Third order neurons arise in thalamus and continue to cerebral cortex Spinoreticular Tract Pain signals from tissue injury Decussate in spinal cord and ascend with spinothalamic fibers End in reticular formation (medulla and pons) 3rd and 4th order neurons continue to thalamus and cerebral cortex Spinocerebellar Pathway Proprioceptive signals from limbs and trunk travel up to the cerebellum Second order nerves ascend in ipsilateral lateral column Corticospinal Tract Precise, coordinated limb movements Two neuron pathway upper motor neuron in cerebral cortex lower motor neuron in spinal cord Decussation in medulla Descending Motor Tracts Tectospinal tract (tectum of midbrain) reflex turning of head in response to sights and sounds Reticulospinal tract (reticular formation) controls limb movements important to maintain posture and balance Vestibulospinal tract (brainstem nuclei) postural muscle activity in response to inner ear signals The Patellar Tendon Reflex Arc Downloaded from: Gray's Anatomy (on 1 October 2007 07:22 PM) © 2007 Elsevier Downloaded from: Gray's Anatomy (on 1 October 2007 07:22 PM) © 2007 Elsevier Downloaded from: Gray's Anatomy (on 1 October 2007 07:22 PM) © 2007 Elsevier
