Sensational Somatosensory System Quiz
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Questions and Answers

Which type of receptor functions over a broad range of temperatures with some overlap in the moderate temperature range?

  • Warm receptors (correct)
  • Mechanoreceptors
  • Cold receptors
  • Polymodal nociceptors

What is the basis for the reduced threshold for pain, known as hyperalgesia?

  • Local edema
  • Redness of the skin
  • Release of substances sensitizing the nociceptors to stimuli (correct)
  • Blood vessel permeability

Which type of pain is poorly localized and characterized as aching, burning, or throbbing?

  • Referred pain
  • Slow pain (correct)
  • Polymodal nociceptor pain
  • Fast pain

What is the phenomenon that explains why people describe the taste of chili peppers as 'hot'?

<p>Activation of transient receptor potential (TRP) channels by capsaicin (B)</p> Signup and view all the answers

Which type of nociceptor is supplied by myelinated A-delta afferent nerve fibers and responds to mechanical stimuli such as sharp, pricking pain?

<p>Thermal or mechanical nociceptors (TRPV or TRPM8 channels) (A)</p> Signup and view all the answers

What type of pain is carried on C fibers and is characterized as aching, burning, or throbbing pain that is poorly localized?

<p>Slow pain (B)</p> Signup and view all the answers

What is the phenomenon that gives a cold sensation and involves the activation of TRPM8 channels by compounds like menthol?

<p>Transduction of cold temperatures (C)</p> Signup and view all the answers

What type of nociceptor is supplied by unmyelinated C fibers and responds to high-intensity mechanical or chemical stimuli and hot and cold stimuli?

<p>Polymodal nociceptors (D)</p> Signup and view all the answers

What type of pain is carried on A delta, group II, and group III fibers, has a rapid onset and offset, and is precisely localized?

<p>Fast pain (D)</p> Signup and view all the answers

What type of pain is of visceral origin that is misperceived as pain arising from a somatic location?

<p>Referred pain (A)</p> Signup and view all the answers

What is the phenomenon where pain is misperceived as arising from a somatic location according to the dermatomal rule?

<p>Referred pain (C)</p> Signup and view all the answers

What is the name of the map of the body that is called the somatosensory homunculus?

<p>Somatosensory homunculus (B)</p> Signup and view all the answers

Which type of information is processed by the somatosensory system?

<p>Touch, position, pain, and temperature (D)</p> Signup and view all the answers

Which type of information is processed by the dorsal column system?

<p>Fine touch, pressure, two-point discrimination, and vibration (D)</p> Signup and view all the answers

Which type of nerve fibers are mainly found in the anterolateral system (Spinothalamic pathway)?

<p>Group III and group IV fibers (B)</p> Signup and view all the answers

Where do the axons of the second-order neuron in the anterolateral system (Spinothalamic pathway) cross the midline?

<p>In the spinal cord (D)</p> Signup and view all the answers

Where is the third-order neuron located in the somatosensory pathway?

<p>In the thalamus (D)</p> Signup and view all the answers

What does the somatotopic arrangement in the thalamus mean?

<p>It means that somatosensory information from one side of the body is received in the contralateral thalamus (A)</p> Signup and view all the answers

Where is the fourth-order neuron located in the somatosensory pathway?

<p>In the somatosensory cortex (B)</p> Signup and view all the answers

What type of representation does the somatosensory cortex have?

<p>Somatotopic representation (B)</p> Signup and view all the answers

Which type of information is mainly processed by the dorsal column system?

<p>Fine touch and pressure (D)</p> Signup and view all the answers

Where do the axons of the second-order neuron in the dorsal column system cross the midline?

<p>In the brain stem (D)</p> Signup and view all the answers

What is the function of the fourth-order neuron in the somatosensory pathway?

<p>Located in the somatosensory cortex and integrates complex information (C)</p> Signup and view all the answers

What type of information is processed by the anterolateral system (Spinothalamic pathway)?

<p>Pain, temperature, and light touch (A)</p> Signup and view all the answers

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