Test 2 #1 Flashcards
things that you see, hear, and touch are ______ stimuli
exteroceptive
the erector spinal is innervated by neurons found in the ______
medial ventral horn
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100
where are alpha motor neurons found?
gray matter of spinal cord
proprioceptive sensation of the lower limb is carried by which tract?
gracile
sensory information arriving at one side of the body or head typically reaches the cerebral cortex of the contralateral side. The axons that cross the midline to accomplish this are the axons of
2nd order neurons
what tract turns your head in response to a stimulus?
tectospinal
the nucleus dorsalisls is located in the spinal cord at the segmental levels of
T1-L2
most reflexes are simple and require synapses within only one spinal segment. Which reflex requires synapses over several spinal segments?
withdrawal reflex
which does not contain corticobular fibers?
lateral corticospinal
which contain descending upper motor fibers?
all the above
pathway carries pain sensation to the cerebrum?
spinothalamic
a 58 year old woman complains of left hand weakness that she noticed while planting flowers in her garden. Neurological examination indicates weak wrist and finger flexion and extension. She also has weakness abducting and adducting and opposing her thumb. all other motor and sensory tests are normal.
Right precentral gyrus
52 y/o woman unable to mover her left leg visits your office. Sensory modalities infall her limbs are retained and there appears to be no sign of weakness in any of her other limbs. In which of the following structures are the cell bodies of lower motor neuron innervating the lower limb are located?
Lammina VIII and IX
where do the fibers of the anterior corticospinal tract cross?
midline of the spinal cord
a 63 year old man has a loss of discriminative touch, vibratory sense and proprioception on his right arm. Where are the cell bodies for a second order neurons in the pathway located?
cuneate nucleus
lamina of the rexed (spinal lamina of the gray matter) that collectively form the posterior horn are
I-VI
a stimultaneous and opposite pattern of activity in the contralateral limb is known as
crossed effects
35 year old roofer is examine in the emergency department after falling two stories and landing abdomen first on a barrel. Reveals weakness and loss of pain and temperature sensation in the left and right lower limbs. What area of the CNS is most likely involved?
anterior spinal cord
the area of skin that is innervated by a single nerve and it’s receptors is called a
receptive field
what are the posterior columns?
gracile and cuneate fascicles
crossing fibers originating from the gracile nucleus is called?
Internal arcuate fiers
erector spinae is innervated by neurons in the
medial ventral horn
the posterior spinocerebeller tract originates from which nucleus?
dorsal thoracic
