Question

23) If Michael suffers a vertebral injury and is paralyzed from the waist down, this means that he has lost motor control but maintains sensation. What injured part of his central nervous system is most likely causing his paralysis? a) interneurons in his sacral region that have been damaged b) ascending tracts of nerves that have been damaged c) only the motor neurons that innervate his body from the waist down that have been damaged d) only the sensory motor neurons that innervate his body from the waist down that have been damaged 25) Why is it beneficial that sensory information received can synapse directly with a motor neuron? a) it’s not because it produces erratic and wild motion b) because it is faster communication and causes faster involuntary movement c) because it is faster communication and causes faster voluntary movement d) because it can stimulate the “fight or flight” response.Which of the following cranial nerves is NOT involved with eye movement

Answer 1

Question number 23 answer is option C ,because the person is paralyzed from the waist therefore the motor fibre which is supplying the waist region from spinal cord has been damaged,spinal cord caring both motor and sensory neurone motor neurone or descending neurone from the central nervous system in the central nervous system motor cortex is present ,motor cortex send signal to the spinal cord from the spinal cord the spinal neurones supplying the muscles and help in motor moment when paralysis because there is involvement of th these motor neurones while in case of sensory neurone they are the asending neurone from the spinal cord this neurone send fibre and goes to area of sensory cortex and this neurones carry the sensation ,

Motor area in the spinal cord are cortico bulbar tract while the sensory area spinothalamic tract and dorsal column fibre.

Question number 25 answer is option b because when the sensory neurone is directly in the connection with the motor neurone there is fast involuntary movement can be occur and monosynaptic reflex is better initiated in a fast way.

monosynaptic reflex is does not involve the voluntary movement because for the voluntary movement the upper motor neurones are always involved from the cerebral cortex.

in the Eye movement there are three cranial nerves are involved cranial nerves number 3 oculomotor nerve

and cranial nerve number four trochlear nerve

and cranial nerves number six abducense nerve.