Exam 15: Sensory Pathways and the Somatic Nervous System

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Figure 15-1 Spinothalamic Tracts Use Figure 15-1 to answer the following questions: -Where in the spinal cord is the structure labeled "2" located?

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Question 1

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In-Text Figure Based Questions -Which tactile receptors are located in the dermis? (Figure 15-4)

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Question 2

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What are differences and similarities between "crude" touch and "fine" touch sensations?

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Crude touch refers to sensations from stimulation of tactile receptors of low sensitivity with large receptive fields. In contrast, fine touch refers to tactile receptors of high sensitivity with small receptive fields. Crude touch ascends in the anterior spinothalamic pathway whereas fine touch ascends in the posterior column pathway. The spinothalamic pathway crosses the neural axis in the spinal cord but the posterior column pathway crosses in the medulla oblongata. Both ultimately project to the somatosensory cortex on the contralateral side of the stimulus in the same region of cortex.

A ________ potential is a depolarization of a sensory dendrite that can lead to an afferent nerve impulse if strong enough.

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Question 4

Figure 15-1 Spinothalamic Tracts Use Figure 15-1 to answer the following questions: -The third-order neuron in this pathway synapses in what structure labeled "7"?

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Question 5

The area of the motor cortex that is devoted to a particular region of the body is proportional to the

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Question 6

Sensory neurons that adapt quickly are called ________ receptors.

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Question 7

Upper motor neurons of the corticospinal tract synapse with neurons in

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Question 8

Ascending tracts in the spinal cord relay ________ information.

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Question 9

Descending (motor) pathways always involve at least ________ motor neuron(s).

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Question 10

Why is it that one cannot identify the location of internal organs, although joints and bone location can be identified?

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Question 11

A very large, fast-adapting tactile receptor that is composed of a single dendrite enclosed by concentric layers of collagen is a

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Question 12

The pyramidal system provides

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Question 13

A brain injury to a patient results in facial paralysis. Which descending tract is most likely affected?

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Question 14

Motor neurons whose cell bodies are within the spinal cord are called ________ neurons.

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Question 15

Gustatory receptors are sensitive to dissolved chemicals but insensitive to light. This is due to

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Question 16

The upper motor neurons of the medial pathway are located within any of the following except the

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Question 17

In motor pathways, the only portion of the pathway that is outside of the CNS is the

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Question 18

The neurons of the primary motor cortex are ________ cells.

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Question 19

The spinal tract that relays information concerning crude touch and pressure to the CNS is the

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Question 20

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Exam 15: Sensory Pathways and the Somatic Nervous System

Figure 15-1 Spinothalamic Tracts Use Figure 15-1 to answer the following questions: -Where in the spinal cord is the structure labeled "2" located?

In-Text Figure Based Questions -Which tactile receptors are located in the dermis? (Figure 15-4)

What are differences and similarities between "crude" touch and "fine" touch sensations?

A ________ potential is a depolarization of a sensory dendrite that can lead to an afferent nerve impulse if strong enough.

Figure 15-1 Spinothalamic Tracts Use Figure 15-1 to answer the following questions: -The third-order neuron in this pathway synapses in what structure labeled "7"?

The area of the motor cortex that is devoted to a particular region of the body is proportional to the

Sensory neurons that adapt quickly are called ________ receptors.

Upper motor neurons of the corticospinal tract synapse with neurons in

Ascending tracts in the spinal cord relay ________ information.

Descending (motor) pathways always involve at least ________ motor neuron(s).

Why is it that one cannot identify the location of internal organs, although joints and bone location can be identified?

A very large, fast-adapting tactile receptor that is composed of a single dendrite enclosed by concentric layers of collagen is a

The pyramidal system provides

A brain injury to a patient results in facial paralysis. Which descending tract is most likely affected?

Motor neurons whose cell bodies are within the spinal cord are called ________ neurons.

Gustatory receptors are sensitive to dissolved chemicals but insensitive to light. This is due to

The upper motor neurons of the medial pathway are located within any of the following except the

In motor pathways, the only portion of the pathway that is outside of the CNS is the

The neurons of the primary motor cortex are ________ cells.

The spinal tract that relays information concerning crude touch and pressure to the CNS is the

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