sesnory fibres and pathways connect with the brain
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what do motor fibres do
carry signals to direct contraction of muscles
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what are antagonistic pairs
contraction and extension of each muscle
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what are myofibrills
interleaved strands and actin filaments, chemical reactions cause tension between adjacent flares
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what are msucle spindles
contain sensory endings which are sensitive to stretching, this initiates reflex contraction
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what are poly synaptic reflexes
inhibitory interneurons, mediates link between sensory and motor
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what are semi circular sacs
3 fluid filled sacs aligned with saggital, horizontal and transverse planes. detection of angular accelerations. helps image focused when head rotates.
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what are vesicular sacs
fluid filled and contain special sensors
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what are cranial nerves
there are 12 cranial nerves, the vesicular nerve is the 8th
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what are the vestibulo-occular reflexes?
head rotated but preserves steady image, keeps target in centre of retinal image
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what does the parasympathetic do
relative processes
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what does the sympathetic do
reduces relative processes
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what is function of the spinal cord
major structure that receives sensory afferents from the body and carries the majority of the bulk of PS + S messages
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what is the spinothalamatic tract
receives information from pain, temperature, course touch
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what did penfield and baldrey, 1937 do?
work in the electrical stimulation of the brain, 126 people in surgery, found that the LHS is connected to the right side of the body and vice versa
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what happens during early brain development
it is a cluster of livid cells, then at 20 days it thickens and forms the neural grove. at 24 days, the edges join together to form neural tube. this becomes the brain.
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what is the ventricular system
continious with spinal cord, filled with cerebrospinal fluid, removes waste from the brain, suspends and effectively cushions the brain.
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what is the hindbrain
medella oblongata = cardiovascular and respitory control. the cranial nerves are important in sleep and arousal
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what is the midbrain
substansia nigra = depleted in parkinsons disease and important in visual and auditory systems.
takes place by cells moving outward, development of neurons. once cortical cells in place, form connection. grey matter dominated by cell bodies. 3mm thick, 2500cm squared
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Other cards in this set
Card 2
Front
how is information brought to the spinal cord
Back
sesnory fibres and pathways connect with the brain
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