QUESTION 46 The cell bodies of upper motor neurons are found in the ______. thal

Question

QUESTION 46

The cell bodies of upper motor neurons are found in the ______.

thalamus

ventral grey horn

dorsal grey horn

postcentral gyrus

precentral gyrus

QUESTION 47

Somatic sensory information from tactile discs, tactile corpuscles, and hair follicle receptors travels to the ______ side of the cerebral cortex in the _____ tract.

ipsilateral; spinocerebellar

ipsilateral; spinothalamic

contralateral; dorsal column-medial lemniscal

contralateral; corticospinal

QUESTION 48

Select the statement that is most correct.

Ganglia are collections of neuron cell bodies within the spinal cord.

Ganglia associated with afferent nerve fibers contain cell bodies of sensory neurons.

The dorsal root ganglia contain motor neurons.

The cell bodies of primary sensory neurons are located in the spinal cord.

QUESTION 49

Schwann cells are functionally similar to ________ in that both are responsible for myelinating axons.

ependymal cells

microglia

oligodendrocytes

astrocytes

QUESTION 50

Numerous presynaptic neurons synapse on one postsynaptic neuron simultaneously. The resulting cumulative effect is a depolarization that is larger in magnitude than the depolarization normally caused by an individual synapse. This cumulative effect would be called ______.

An all-or-none phenomena

Spatial summation

Temporal summation

A threshold stimulus

A subthreshold stimulus

QUESTION 51

Innervates blood vessels throughout the body.

Parasympathetic

Sympathetic

Neither

QUESTION 52

Information from proprioceptors receptors travels to the ______ side of the cerebellum in the _____ tract.

ipsilateral; spinocerebellar

ipsilateral dorsal column-medial lemniscal

contralateral; dorsal column-medial lemniscal

contralateral; spinocerebellar

QUESTION 53

Increases heart rate and causes bronchodilation.

Parasympathetic

Sympathetic

Neither

QUESTION 54

If the binding of a neurotransmitter to its receptor causes the postsynaptic membrane become ______, this is called an inhibitory postsynaptic potential (IPSP).

depolarized by only a small magnitude

more permeable to K+

depolarized, but not enough to stimulate an action potential

hyperpolarized enough to stimulate an action potential

QUESTION 55

Axons of lower motor neurons synapse _______.

in the ventral grey horn of the spinal cord

in the dorsal root ganglia

in the thalamus

at neuromuscular junctions in the periphery

QUESTION 56

A Golgi tendon organ would sense _______.

tension in the tendon caused by muscle contraction

length changes in the muscle-tendon system

the rate at which the muscle length is changing

sudden stretch of the muscle

QUESTION 57

" If the ventral root of a spinal nerve were cut, what would be the result in the region that nerve supplies?"

complete loss of sensation

a complete loss of voluntary movement

loss of neither sensation nor movement but only of autonomic control

a complete loss of sensation and movement

QUESTION 58

" A patient who received a blow to the side of the skull exhibits the following signs and symptoms on the ipsilateral side of the face: he is unable to close his eye, and the corner of his mouth droops. Which cranial nerve has been damaged?"

facial

glossopharyngeal

hypoglossal

accessory

QUESTION 59

Which of the following is not characteristic of neurons?

They conduct impulses.

They have extreme longevity.

They frequently undergo mitosis.

They have an exceptionally high metabolic rate.

QUESTION 60

Collections of nerve cell bodies outside the central nervous system are called ________.

nuclei

nerves

ganglia

tracts

QUESTION 61

Channels that open in response to a change in membrane potential and are responsible for conducting action potentials are ________ channels.

mechanically gated

voltage-gated

leakage

ligand-gated

Explanation / Answer

Ans 46) The cell bodies of upper motor neurons are found in the post central gyrus. It is present in the lateral parietal lobe of the human brain and is the main sensory area for sense of touch.

Ans 47) b) Ipsilateral, Spinothalamic

The spinothalamic tract is a sensory pathway that is present from the skin to the thalamus and it helps in relaying information upward to the somatosensory cortex of the post-central gyrus.

Ans 48) a) Ganglia are collections of neuron cell bodies that are present within the spinal cord. They are nerve cell cluster or group of nerve cell bodies which holds cell bodies of afferent and efferent nerves.

Ans 49) c) OIigodendrocytes – They are similar to Schwann cells which are responsible for myelinating axons. They myelinate the axons of the CNS.

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