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20 Cards in this Set
- Front
- Back
What is the foramen of the spinal cord and what is the dura sinus filled with?
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-hole that is used for the spinal cord to pass through
-dura sinus is filled with adipose cells |
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What is the Posterior branch of the spinal cord?
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-Ramus
-branch off spinal nerve adn go towards the posterior part of the body such as the back |
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What is the inferior branch of the spinal cord?
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-Rami communicants
-part of the autonomic system -runs to the sympathetic trunk ganglion |
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What is the anterior ramus of the spinal cord?
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-branches off to the lateral parts of the body
-runs parallel (ex. in thoracic cavity, parallel to ribs) -many brnahces -branches run to body wall. Inferior to organs |
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What are mixed nerves?
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-spinal nerves that make up both sensory and motor neurons
-posterior and anterior Rami contian both |
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What are Dermatome maps?
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-Body is mapped out according to spinal nerves that run to a certain part of the body
-helps identify which spinal nerve/nerves are responsible for what part of the body. |
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Where do the Lumbar nerves run to?
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-anterior part of the legs
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Where do the sacral nerves run to?
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-posterior part of the legs
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What are the steps of a reflex?
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-stimulus activates sensory neurons
-sensory neuron-->spinal nerve (posterior horn) -interneurons -motor neurons -effectis cause the response |
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What is a monosynaptic reflex?
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-requires no interneurons
-one synapse (motor and sensory neuron) ex. knee jerk reflex |
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What are the steps of a knee jerk reflex?
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-mallet hits area inferior to patella (kneecap)
-mallet distorts ligament and bends it back into fat which pulls on patella -patella pulls on tendons -tendons pull on Quad muscles in leg (stretch) -impulses run to spinal nerve to posterior root to gray matter -motor neurons sned impulse into spinal nerve, contracts muscles and flips leg out |
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What are muscle receptors?
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-monitor the stretching of muscles and the overlapping of filaments
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What are stretch receptors?
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-pull on the muscle
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How is white matter organized in the spinal cord?
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-in bundles of interneuron axons (in Tracts)
-transports sensory information from body to the brain -some contain axons with interneurons -carry interneurons to the brain |
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What do motor tracts do?
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-carry impulses away from the brain
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What does it mean that pathways of the brain are reversed?
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-right side of the brain controls left side of body and vice versa
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What are the steps necessary in order to remvoe a tack?
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-step on tack with left foot, causes pain
-pick up left foot, stiffen right leg for balance -reach down and remove tact with right hand, left hold foot -bend neck to focus on tack |
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Where does the impulse go after stepping on a tack?
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-impulse goes from foot to calf, pelvis, spinal nerve, and spinal cord.
-ends at L1 |
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What are the muscle reflexes involved after stepping on a tack?
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-contract muscles in calf and thighs to get foot to move
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What is the path of the impulse after stepping on a tack?
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-sensory neuron synapse with interneurons from posterior horn to anterior horn
-interneurons synapse with motor neurons and the axon goes back to foot |