Test 2 #3 Flashcards
how many neurons participate in a stretch reflex such as a knee jerk?
2
What cortical layer contains BETZ cells?
Inner pyramidal
Alpha motor neurons innervate
Extrafusal fibers
gamma motor neurons innervate
intrafusal fibers
Afferent fibers are always sensory t/f?
False
t/f corticospinal fibers are association type fibers?
true
strip of skin innervated by single spinal nerve
dermatome
muscle spindles are
stretch receptors
Nuclear bag fibers receive _____ and _____ fibers
IA primary afferent, Group II afferent
the corticospinal tract descends in the _____ limb of the internal casual and is originated in the _____ cortex within the percentile gyrus
posterior, motor
in the spinal cord the ventral root is ______ in function
motor
compared to large muscles in the thigh, finger muscles require
greater neuronal involvement
first order tract of proprioception from the lower limb is the ______ tract
fasciculus gracilis
the unconscious proprioceptive fibers of the fasciculus cuneus terminates in the ______ nucleus
accessory cuneate
loss of _____ would result from a lesion of the cortical spinal tract?
Ipsilateral voluntary motor control
the _______ tract is concerned with intersegmental spinal reflexes
fasciculus proper
gives rise the lateral corticospinal tract
pyramidal decussation
which of the following tracts decussates in the midbrain
ventral spinocerebellar
which of the following tract move the head in maintaining equilibrium and center of gravity
vestibulospinal
lateral entry zone of the dorsal root contains______ fibers
proprioceptive
the anterior entry zone of the dorsal root contains _____ fibers
fine touch
when trying to get glass of water, hand trembles more and more as it get closer to the glass. This describes a problem where?
lesion in the cerebellum
Sensory structures in the medulla are _____ to the sulcus limitans
lateral
Sensory structures in the spinal chord are
dorsal
anterio cortico spinal tract crosses the midline of the ______
spinal cord
the posterior spinocerebellar tract originates from the neurons located ______
(VII) nucleus of clarke
reticular formation
goes everywhere and does everything
at what level does the pathway for pain and temperature sensation for the lower limbs cross the midline?
lumbosacral spinal cord
untrue of VPL nucleus
project to the cingulate gyrus
spinal cord segments ____ form the cervical enlargement
C5-T1
greatest diameter of the lumbar enlargement is at___ level
T12
Dorsal nucleus of Clarke is located in what lamina?
VII
pain and temperature is sent via
Spinothalamic
mossy cell fibers are primarily ______ in function
excitatory
Spinocerebellum (paleocerebellum) controls ____ type movements
gross
Pontocerebellum (neocoerebellum) controls ____ type of movement
fine
blood drains out of the cranium through the _____ vein
internal jugular vein
middle cerebral artery runs with the _______
lateral sulcus
What supplies the visual cortex?
posterior cerebral artery
which drains deep?
Great vein of Galen
What crosses the corpus callous?
anterior cerebral artery
what drains the internal structures of the brain?
Great cerebral vein of Galen
drains the brain
Internal jugular vein
what artery supplies blood to the interior part of the temporal lobe?
Posterior cerebral artery
