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Chapter 16 lecture objectives.docx - Chapter 16-Learning...

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Chapter 16-Learning ObjectivesSpinal cord Function:1.Pathway between body and mind2.Contains ascending (sensory info) and descending tracts (motor info) of the CNS3.Integrates and processes info (functional independence)Structure and Location1.~18 inches in length (the cord itself)2.Runs from the foramen magnum to ~L1/L23.Cervical enlargement: C4-T1(arm nerves)4.Thoracic region: T1-T8(leg nerves)5.Lumbar enlargement: T9-L1Structures of spinal cord1.Conus medullaris: tapered, lower end of the spinal cord. Has anchoring to keepspinal cord in place when jumping down. Has a cord attached to its end called…2.Filum terminale: extends from conus medullaris to coccyxa)Anchors spinal cord (along with denticulate ligaments) down to coccyxb)Composed of pia mater3.Denticulate ligaments are also extensions composed of pia matter except theyextend off the sides perpendicular in direction to the filum terminale.4.Cauda equina: “horse tail”a)Lower lumbar and sacral nerves travel through vertebral foramen beforeexiting the vertebral column.Sectional anatomy of the spinal cord1.Anterior fissure: the anterior surface (has a big slice in front)2.Posterior sulcus: the posterior surface (shallow)Neural tissue organization1.White mater: have myelinated axons (makes the mater look white)a)if the white mater (myelinated axons) are in the CNS we call it a TRACTb)If white mater (myelinated axons) are on PNS we call it NERVES2.Gray mater: non-myelinated axonsWe see a lot of neuron cell bodies here, dendrites, axon terminals)a)If we have a collection of neuron cell bodies in the CNS we call it a NUCLEI(plural) NUCLEUS (singular)b)If we have a collection of neuron cell bodies in the PNS we call it GANGLIA(plural) GANGLION (singular)Spinal Roots: hang off the spinal cord1.Dorsal (posterior) root:contains sensory neurons. (on the back)a)Dorsal root ganglia: neuron cell bodies of sensory neurons2.Ventral (anterior) root: contains motor neurons (on the front)Anatomy of Spinal Cord
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Term
Spring
Professor
CameronQ.Sheeler
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