nervous system part 2

nervous system part 2 - Spinal Cord Spinal Cord Structure...

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Unformatted text preview: Spinal Cord Spinal Cord Structure REGIONS REGIONS Cervical Thoracic Lumbar Sacral Spinal Cord Structure SOME FEATURES TO NOTE Conus Medullaris Cauda Equina Spinal Meninges Dura mater Spinal Meninges Spinal Cord in Cross-Section Note the arrangement of gray and white matter Dorsal roots sensory nerve entry into CNS (afferents) Dorsal root ganglia soma of sensory cells Ventral roots motor axons (efferents) Spinal Cord in Cross-Section BACK BACK FRONT FRONT GRAY MATTER GRAY MATTER (ventral) (dorsal) WHITE MATTER WHITE MATTER BACK BACK FRONT FRONT (dorsal) (ventral) Spinal Cord in Cross-Section Gray Matter of Spinal Cord NUCLEI NUCLEI Contains various NUCLEI NUCLEI collections of neuron cell bodies neurons of each nucleus are part of PATHWAYS carrying signals in from or out to specific areas of the body Divided into TRACTS TRACTS bundles of axons carrying specific types of information from a common origin to a common destination Many Many TRACTS TRACTS for sensory info for sensory info Many Many TRACTS TRACTS for motor info for motor info White Matter of Spinal Cord Peripheral Nervous System Nerves that connect to spinal cord and brain/brainstem Peripheral Nervous System Nerve organized bundle of axons carrying signals: From the body INTO INTO the CNS ( Sensory Nerve ) From the CNS OUT TO OUT TO the body ( Motor Nerve ) Both (Mixed Nerve Mixed Nerve ) Spinal Nerves 31 pairs of mixed nerves connected to the spinal cord Spinal Nerve VENTRAL ROOT DORSAL ROOT DORSAL ROOT GANGLION Spinal Nerves Information travel in spinal nerves SENSORY information travels into spinal cord along dorsal root Axons of neurons carrying signals synapse with other neurons in the sensory nuclei that will either connect to motor neurons (seen below) or that will carry the signal up the spinal cord to the brain/brainstem MOTOR information travels out from spinal cord along ventral root Motor neurons (whose cell bodies lie in motor nuclei ) carry signals out to skeletal muscle or involuntary tissues (smooth muscle, cardiac muscle, glands) Cranial Nerves...
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nervous system part 2 - Spinal Cord Spinal Cord Structure...

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