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28 Cards in this Set
- Front
- Back
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Where does the body of the spinal cord extend?
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Foramen magnum--->lower border of L1 (conus medullaris)
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How many spinal nerves pairs
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31
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Name spinal cord nerves and #
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8 cervical
12 thoracic 5 lumbar 5 sacral 1 coccyx |
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(T or F) each spinal segment has a paired dorsal and ventral roots with one on each side of the cord
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TTTTTTTTT
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What is the area which spinal nerves emerge from the spinal cord?
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intervertebral formania
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(T or F) spinal nerves C1-C7 emerge above vertebra
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T
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FF: Spinal nerves below T1 emerge below the corresponding vertebra
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Blank
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Where would you find the L4 cell body?
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Near the T11-T12 spinal segment
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What is the structure that connects the gray matter within the spinal cord?
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Gray commmissure
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Describe the lamina in the base of the anterior horn
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Arranged in 10 lamina
Lamina 1 is dorsal & lamina 9 is ventral 10 surrounds the central canal |
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Name and describe the 3 funiculi in the white matter of the spinal cord
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Posterior - lies between the posterior median sulcus and posterior horn
Lateral - lies between dorsal root entry zone & the site where ventral fibers emerge Anterior - lies between the emerging ventral rootlets and anterior median fissure |
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Describe the landmarks on the external surface of the spinal cord (3)
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Anterior median fissure - midline of spinal cord on anterior surface. Contains anterior spinal artery
Posterior median sulcus - fissure on posterior spinal cord. Separates two posterior columns and contains posterior spinal vein Posterior intermediate sulcus - divides posterior funiculus into 2 white columns (ONLY IN CERVICAL AND UPPER THORACIC VERTEBRA) Begins at T7 |
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Describe the sacral spinal cord
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Small diameter
Large amount of gray matter/small white matter Short, thick gray commissure |
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Name two structures located in the lateral funciulus (sacral)
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Lateral corticospinal tract
Anterolateral system |
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Where is the gracile fasiculus located
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Dorsal column/posterior funiculus
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Describe the lumbar cord
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Nearly circular
MASSIVE anterior and posterior horns Less white matter than cervical segments |
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Name two structures located in the lateral horn of the lateral horn of the lumbar cord
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Nucleus dorsalis
Intermediolateral cell column |
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In the lumbar spinal cord, where is touch, proprioreception, and vibration processed?
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Gracile fasciculus
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In the lumbar spinal cord, where is pain and temperature processed?
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Anteriolateral system
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Describe the thoracic cord
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Small in diameter bc of reduction in gray matter
Small anterior and posterior horns Lateral horn contains IML cell column, present at all thoracic levels Contains dorsal nucleus of Clarke (nucleus dorsalis) collection of large cells at base of medial posterior horn (all thoracic levels) |
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Gray matter is __________________in thoracic cord
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wimpy
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Describe cervical cord
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Large size
Much white matter Oval shape Prominent posterior intermediate septum |
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What does the posterior intermediate septum divide?
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Gracile fasciculus
Cuneate fasiculus |
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Memorize dermatome chart
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do it
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Name the mylenated fiber types and their function
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Alpha - proprioreception; somatic motor
Beta - touch, pressure Gamma - motor to muscle spindle Delta - pain, temperature, touch Alpha (largest)--->Delta (smallest) |
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Name the unmylenated fiber type and function
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Dorsal root - pain, reflex responses
Sympathetic - postganglionic sympathetics |
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Describe a primary sensory neuron
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Psuedounipolar
Extends from peripheral sensory receptors to the CNS |
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Approximately how long is the spinal cord
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~30 cm
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