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Brain Structures Overview: Thalamus, Hypothalamus, & Limbic System

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Brain Structures Overview: Thalamus, Hypothalamus, & Limbic System

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Questions and Answers

What is the primary function of the spinothalamic pathway in the somatosensory system?

To transmit fine touch, pressure, vibration and proprioception
To transmit crude touch and pressure sensations
To transmit pain and temperature sensations (correct)
To transmit sensations of fast, sharp pain

What is the primary function of lateral inhibition in the somatosensory pathways?

To increase the intensity of stimulation in surrounding areas
To facilitate the localization of the site of stimulation (correct)
To decrease the sensitivity of the receptor pathway
To amplify the transmission of impulses in less intensely stimulated pathways

What type of neurotransmitter is typically released by nociceptors to signal pain?

GABA
Substance P or glutamate (correct)
Dopamine
Serotonin

Which of the following best describes the role of the second-order sensory neuron in the somatosensory pathways?

It crosses to the opposite side of the CNS and ascends to the thalamus (A) Signup and view all the answers

What is the primary function of the posterior column pathway in the somatosensory system?

To transmit highly localized touch, pressure, vibration and proprioception (D) Signup and view all the answers

How do the somatosensory pathways ultimately reach the level of conscious awareness?

Through the primary sensory cortex (B) Signup and view all the answers

Which type of nociceptor fibers are responsible for transmitting sensations of fast, sharp pain?

Myelinated A-delta fibers (B) Signup and view all the answers

What is the role of the first-order sensory neuron in the somatosensory pathways?

It is the afferent neuron with its peripheral receptor that first detects the stimulus (A) Signup and view all the answers

What is the primary function of pain perception in the somatosensory system?

To bring to conscious awareness tissue damage that is occurring or about to occur (B) Signup and view all the answers

How do the somatosensory pathways become 'labeled' according to modality and location?

Through the decoding of the stimulus by the CNS based on the specific pathway that carries it (A) Signup and view all the answers