25. How is it structurally
explained that the motor
activityof the left side of the
body is controlled by the right
cerebral hemisphere and the
motor activity of the right side
of the body is controlled by
the left cerebral hemisphere?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
In the cerebral hemispheres are
neurons that centrally and
control muscle movements.These
are called superior motor
and they are located a
specialgyrus of both lobes
known as motor (or precentral
gyrus). The motor neurons
send axons transmit impulses to
the motor neurons of the
cord (for neck, trunk limb
movements) and to motor nuclei of
the nerves (for face, eyes
mouth movements).

The fibers to the other side
specific areas of those paths.
About 2/3 of fibers that godown the
cord crossat the medullar
forming a structure known pyramidal
decussation. The other (/3) of fibers
descend in same side of their
cerebral hemisphere and cross
within the spinal cord the level
where their motor spinal root
exit.The that command the
inferior neurons of the cranial
cross to the other just
before the connection the nuclei of
these .

The motor fibers that from the
superior motor to the inferior
motor of the spinal cord
the pyramidal tract. Injuries this
tract, for example, by spinal
sections or central or spinal tumors
lead to paraplegia and .