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Sensory and Motor Pathways Overview

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Questions and Answers

What is the primary function of ascending pathways?

To relay sensory information (correct)

To carry motor commands

To inhibit sensory processing

To facilitate reflex actions

In the somatic sensory pathways, what term is used to describe the series of neurons involved?

Conduction line

Neurotransmitter line

Labeled line (correct)

Pathway line

Which of the following accurately describes the decussation of pathways?

It is a type of sensory information processing

It denotes the cross-over of pathways to the opposite side of the brain (correct)

It describes the reduction of sensory signals

It refers to the pathways that do not cross over

Which statement about the anterior spinothalamic tract is true?

It carries signals regarding crude touch and pressure Signup and view all the answers

What characterizes an ipsilateral pathway?

It remains on the same side of the body Signup and view all the answers

What is the primary role of motor pathways?

To carry motor commands from the brain Signup and view all the answers

Which order neuron in the somatic sensory pathways runs from the thalamus to the sensory cortex?

3rd order neuron Signup and view all the answers

What does contralateral mean in the context of sensory pathways?

Pathway crosses over to the other side of the brain. Signup and view all the answers

What type of sensations does the anterior spinothalamic tract primarily transmit?

Crude touch and pressure Signup and view all the answers

What does the term 'labeled line' refer to in the context of somatic sensory pathways?

The series of neurons involved in transmitting sensory information Signup and view all the answers

Study Notes

Sensory and Motor Pathways

Sensory pathways: Ascending pathways carry sensory information.
Motor pathways: Descending pathways carry motor commands.
Decussation: Pathways cross over to the other side of the brain.
- Ipsilateral: pathway does not cross over.
- Contralateral: pathway crosses over.
Somatic sensory pathways: Series of neurons called the labeled line.
- 1st order neuron: receptor to brainstem or spinal cord.
- 2nd order neuron: brainstem or spinal cord to thalamus.
- 3rd order neuron: thalamus to sensory cortex.
- Neurons collectively known as a labeled line, usually named for their origin or termination.

Sensory Pathways (Conscious Awareness)

Conscious awareness: Sensations we are consciously aware of.
Anterior spinothalamic tract: Carries information about crude touch, pressure, itch, and tickle.
- Contralateral destination: cerebral cortex.

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Description

Explore the key concepts of sensory and motor pathways in the nervous system. Understand the differences between ascending and descending pathways, and learn about the decussation and the labeling of somatic sensory pathways. This quiz will test your knowledge on the conscious awareness of sensory pathways.