Term
| gray matter of the spinal cord has what purpose? |
|
Definition
| receives and integrates incoming and outgoing info |
|
|
Term
| what tracts propagate impulses from sensory receptors up the spinal cord to the brain |
|
Definition
| sensory (ascending) tracts propagate |
|
|
Term
| what pathway are sensory and motor tracts |
|
Definition
| they are part of the somatic sensory pathway |
|
|
Term
| what tracts propagate impulses from the brain? |
|
Definition
| motor (descending) tracts propagate impulses, towards effectors |
|
|
Term
| what are the 2 main routes nerve impulses propate? |
|
Definition
they propagate up the spinal cord via, the posterior column medial lemniscus pathway
and the spinothalamic tracts |
|
|
Term
| what are spinothalamic tracts? |
|
Definition
| spinothalamic tracts (anterolateral) are composed of thousand of sets of 3 neurons (1st,2nd & 3rd order) |
|
|
Term
| what is the purpose of the lateral spinothalmaic tract |
|
Definition
| conveys sensory impulses for pain and temperature |
|
|
Term
| what is the purpose of anterior spinnothalamic tract |
|
Definition
| conveys impulses for tickle, itch crude touch pressure vibrations |
|
|
Term
| what are the 2 tracts of the posterior columns |
|
Definition
| gracile fasiculus and cuneate fasiculus |
|
|
Term
| the posterior columns carry impulses for ? |
|
Definition
| touch, pressure, sensation |
|
|
Term
|
Definition
| perception of the position of body parts, esp the limbs, independent of vision |
|
|
Term
|
Definition
| recognition of the location, shape, size and texture of mechanical obj that contact skin |
|
|
Term
|
Definition
| the ability to discern that 2 nearby objectstouching the skin are 2 distinct pts |
|
|
Term
| a pathway in the posterior columns is ______ |
|
Definition
| posterior colummn-medial lemniscus pathway |
|
|
Term
| a ribbon-like tract that extends from the medulla to the thalamus |
|
Definition
|
|
Term
| the abillity to recognize size shape and texture of an object by touching |
|
Definition
|
|
Term
| conduct impulses from the brain (primary motor region to skeletal muscle) |
|
Definition
| somatic motor tracts (descending) |
|
|
Term
| two types of descending pathways |
|
Definition
| direct pathways (pyramidal) and indirect (extrapyramidal) pathways |
|
|
Term
| what do direct (pyramidal) pathways do? |
|
Definition
| convey impulses that originate in the cerebral cortex, cause precise voluntary movements |
|
|
Term
| provide input to lower motor neurons, innervate skeletal muscles, upper motor neurons end in gray horn on same side |
|
Definition
| lateral corticospinal tract |
|
|
Term
| what does the indirect(extrapyramidal) pathway include |
|
Definition
| rubrospinal, tectospinal and vestibulospinal tracts |
|
|
Term
| convey impulses from the brain stem and other parts of the brain |
|
Definition
| indirect (extrapyramidal) pathways |
|
|
Term
| what does the indirect (extrappyramidal) pathway do? |
|
Definition
| maintain skeletal muscle tone and contraction of postural muscles, role in equilibruium by regulating muscle tone in response to head movements, he3lp coordinate body movements with visual stimuli |
|
|
Term
| a fast involuntary unplanned sequence of actions in repsponse to a stimulus |
|
Definition
|
|
Term
|
Definition
|
|
Term
| integration takes place in the gray matter ______ reflex |
|
Definition
|
|
Term
| integration occurs in the brainstem, ____ reflexes |
|
Definition
|
|
Term
| involves contraction of the skeletal muscles, _______ reflexes |
|
Definition
|
|
Term
| not consciosly perceived, responses of smooth muscle, cardiac and glands, ____ reflexes |
|
Definition
| autonomic (visceral) reflexes |
|
|
Term
| 5 functional components of a reflex arc |
|
Definition
| sensory receptor, sensory neuron, integrating center, motor neuron, effector |
|
|
Term
| responds to stimuli by producing an action potential, _____ |
|
Definition
|
|
Term
| propagates the impulse to the gray matter of the spinal cord or brain stem, _______ |
|
Definition
|
|
Term
| one or more regions of gray matter in the CNS _______ |
|
Definition
|
|
Term
| a single synapse between a sosory neuron and a motor neuron |
|
Definition
|
|
Term
| involves more than 2 types of neurons and more than one cns synapse |
|
Definition
|
|
Term
| carries the impulse triggered by the integrating center out of the cns to the responding part |
|
Definition
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