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31 Cards in this Set
- Front
- Back
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List the 2 components of the Central Nervous Sytem |
Brain Spinal cord |
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Describe the spinal cord and its location |
Inside vertebral canal, 2/3 length of canal |
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Define and describe - Cervical Enlargement |
For innervation of the upper limb; Neck area |
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Define and describe - Lumbar Enlargement |
For innervation of the lower limb; Lower limbs |
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Define and describe - Conus Medullaris |
End of spinal cord; L1-L2 region |
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Define and describe - Cauda Equine |
Tail of nerves |
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Define and describe - Film Terminale |
Holds the spinal cord in place; Pelvis bone area |
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Define and describe - Posterior Median Sulcus |
Surface on dorsal side; Bump on the back |
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Define and describe - Anterior Median Fissure |
More prominent; Deep fold on the front |
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List the three meninges of the spinal cord (Inner to outer) |
1. Pia Mater 2. Arachnoid Mater 3. Dura Mater |
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Define - Pia Mater |
Tiny; Wraps spinal cord; Denticulate ligament anchors spinal cord laterally; Filum terminal anchors spinal cord inferiorly |
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Define - Arachnoid Mater |
Spidey; Lines inside of dura matter; Subarachnoid space filled with CS fluid; Arachnoid trabecular: meshwork of fibers |
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Define - Dura Mater |
Tough; Foramen magnum - coccyx; Fuses w/nerve coverings laterally; Fuses w/filum terminale inferiorly; Epidural space filled w/viens and fatty C.T.; Stabilizes and protects spinal cord |
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Define - White Mater |
TRACTS of myelin sheath ascending (afferent = sensory) and descending (efferent = motor) |
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Define - Gray Mater |
CELL BODIES of afferent and efferent neurons (and neuroglia) |
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Describe - Spinal Nerves |
31 pairs 8 cervical 12 thoracic 5 lumbar 5 sacral 1 coccygeal |
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Define - Nerve |
Collection of cell processes (dendrites and axon) surrounded by C.T. coverings
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How do the spinal nerves exit the vertebral canal |
Exit the inter vertebral foramina (one per side) then branch to innervate the body |
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Define - Ventral Primary Rami |
Form plexuses - "braids" of nerves |
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Define - Dorsal Primary Rami |
Sensory on skin of back Deep back muscles |
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Define - Reflex |
Immediate involuntary motor response to specific stimulus; Helps preserve homeostasis with rapid somatic/visceral adjustments |
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List the 1st step of a reflex arc |
Stimulus activates receptor |
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List the 2nd step of a reflex arc |
Sensory neuron brings info. to CNS |
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List the 3rd step of a reflex arc |
Processing in CNS |
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List the 4th step of a reflex arc |
Activation of motor neuron |
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List the 5th step of a reflex arc |
Effector response |
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Explain the 1st step of stretch reflex |
Stimulus activates receptors |
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Explain the 2nd step of stretch reflex |
Sensory neuron brings info to CNS |
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Explain the 3rd step of stretch reflex |
Monosynaptic = 1 synapse =sensory neuron activates motorneuron directly |
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Explain the 4th step of stretch reflex |
Activation of motor neuron |
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Explain the 5th step of stretch reflex |
Effector response; Effector = original muscleResponse = contraction toprotect from further stretch |
