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What do we call the body's specialized cells htat monitor specific internal or external conditions
Is it possible for somatic motor comands to arise at the subconscious level?
Yes, subconscious and conscious
a decrease in receptor sensitivity or perception after chronic stimulation
Receptor A has a circular field with a diameter or 2.5 cm. Receptor B has a circular rececptive field 7.0 cm in diameter. Which receptor provides more precise sensory informaton?
List the four types of general sensory receptors, and identify the nature of the stumulus that excites each type
- 1.) nociceptors-pain
- 2.) thermoreceptors-temperature
- 3.) mechanoreceptors-physical distortion
- 4.) chemoreceptors-chemical concentration
Identify the three classes of mechanoreceptors
- 1.) tactile
- 2.) baroreceptors
- 3.) proprioceptors
What would ahppen to you if the information from proprioceptors in your legs were blocked from reaching the CNS
your movements would be uncoordinated and you likely could not walk
As a result of pressure on her spinal cord, Jill cannot feel fine touch or pressure on her lower limbs. Which spinal tract is being compressed?
Fasciculus gracilis in the posterior column of the spinal cord
Which spinal tract carries action potentials generated by nociceptors?
lateral spinothalamic tracts
Which cerebral hemisphere receives impulses conducted by the right fasciculus gracilis?
The left cerebebral hemisphere (specifically, the primary sensory cortex)
What is the anatomical basis for the fact that the left side of the brain controls motor function on the right side of the body?
crossing-over (decussation) of axons, so the motor fibers of the corticospinal pathway invervate lower motor neurons on the opposite side of the body
An injury involving the superior portion of the motor cortex affects which region of the body
affect the ability to control the muscles in th eupper limb and the upper portion of the lower limb
What effect would increased stimulation of the motor neurons of the red nucleus have on muscle tone
increase stimulation of the skeletal muscles in the upper limbs, increasing muscle tone