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Download 203 lab 11 fall 09 final
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Week 11 The Spinal Cord Objective 1: The spinal cord and spinal nerves Conus Medullaris and Cauda Equina (horses tail) Cross Section of Spinal Cord and Vertebrae The meninges: The Real Thing Between C2 and C3 Cross Section Outer white matter, inner gray matter Conus Medullaris and Cauda Equina Cross sectional anatomy of the spinal cord A visual analogy? Dorsal horns •sensory neurons Dorsal horn? Ventral horn? Gray commissure Ventral horns •motor neurons Regional Differences Cervical Thoracic Cervical enlargement Lateral horn Lumbar enlargement Lumbar Sacral White Matter •fiber tracts for transmission of information •ascending (sensory) tracts •descending (motor) tracts Posterior funiculus Lateral funiculus Anterior funiculus Anterior median fissure Some fiber tracts in the different funiculi Posterior funiculus: •Faciculus cuneatus and gracilis •Ascending sensory Lateral funiculus •Spinothalamic tract •Ascending sensory •Corticospinal tract •Descending motor Anterior funiculus •Spinothalamic tract •Ascending sensory •Corticospinal tract •Descending motor Anatomy of a Spinal Nerve Dorsal root: afferent, sensory Ventral root: efferent, motor Dorsal ramus: mixed, motor and sensory to trunk Ventral ramus: mixed motor and sensory form nerve plexi There are 31 pairs of spinal nerves Cervical Plexus The phrenic nerve innervates the respiratory diaphragm “ C3,4,5 keeps the diaphragm alive! Brachial Plexus Lumbar Plexus Sacral Plexus Reflex Arc 1) Receptor - reacts to stimulus 2) Sensory Neurons - afferent impulses to CNS 3) Integration centers - synapses in CNS 4) Motor Neurons - efferent impulses from Integration centers to effector 5) Effector - muscle or glands
