Dr Gawad Physiology Course Online Exams – Mechanoreceptors, Thermoreceptors

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Quizzes Created: 4 | Total Attempts: 8,676

Questions: 7 | Attempts: 619 | Updated: Mar 21, 2023

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Dr Gawad Physiology Course Online Exams Mechanoreceptors, Thermoreceptors - Quiz

7 MCQs (Only one correct answer)
Each MCQ: 1 mark, Total mark: 7 (you will get the results immediately with correction by the web)
Allowed time: 7 min
Good Luck

Questions and Answers

1.

Regarding the ventral spinothalamic tract, which of the following is not true:
- A.
  
  Its afferent fiber is type C fiber.
- B.
  
  The crossing of the tract to the midline is mainly in the second order neuron.
- C.
  
  It transmits crude touch.
- D.
  
  The main centre of this tract is the thalamus.
Correct Answer
D. The main centre of this tract is the thalamus.

Explanation
The ventral spinothalamic tract is responsible for transmitting pain and temperature sensations. It is composed of type A-delta fibers, not type C fibers. The crossing of the tract to the midline occurs mainly in the first order neuron, not the second order neuron. It transmits crude touch, not pain and temperature sensations. The thalamus is not the main center for this tract; instead, the main center is the somatosensory cortex in the brain.

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2.

Regarding the spinocerebellar, which of the following is true:
- A.
  
  The dorsal tract transmits the impulse to both sides of cerebellum.
- B.
  
  The ventral tract is faster than the dorsal one.
- C.
  
  It controls function of the ipsilateral group of muscles
- D.
  
  It is the third fastest pathway regarding CNS conduction.
Correct Answer
C. It controls function of the ipsilateral group of muscles

Explanation
The statement "It controls function of the ipsilateral group of muscles" is true for the spinocerebellar pathway. This pathway is responsible for transmitting sensory information from the muscle spindles and Golgi tendon organs to the cerebellum. It primarily controls and coordinates the movement and function of the muscles on the same side of the body (ipsilateral). This allows for precise and coordinated movement of the limbs and trunk.

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3.

The gracile pathway:
- A.
  
  Transmits subconscious kinesthetic sensation.
- B.
  
  Its afferent is thin slow afferent.
- C.
  
  It runs in the spinal cord medially to the cuneat tract.
- D.
  
  Its transmission is perceived by the thalamus.
Correct Answer
C. It runs in the spinal cord medially to the cuneat tract.

Explanation
The gracile pathway is responsible for transmitting subconscious kinesthetic sensation. It is characterized by thin, slow afferents. This pathway runs in the spinal cord medially to the cuneate tract. The transmission of sensation through this pathway is perceived by the thalamus.

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4.

Stereogenesis depends on the following except:
- A.
  
  Touch sensation.
- B.
  
  Pressure sensation.
- C.
  
  Spinocerebellar tract, the uncrossed ventral one
- D.
  
  Integration of central sensory are.
Correct Answer
C. Spinocerebellar tract, the uncrossed ventral one

Explanation
Stereogenesis is the ability to perceive and interpret depth and spatial relationships. It relies on various sensory inputs, including touch and pressure sensations. The spinocerebellar tract is responsible for transmitting proprioceptive information from the body to the cerebellum, but it does not play a direct role in stereogenesis. Therefore, the spinocerebellar tract, specifically the uncrossed ventral one, is not involved in stereogenesis. The integration of central sensory areas, on the other hand, is crucial for processing and interpreting sensory information, including that required for stereogenesis.

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5.

Which of the following is not an unconscious kinesthetic sensation:
- A.
  
  Sense of muscle tone.
- B.
  
  Momentary state of muscle contraction.
- C.
  
  Muscle length.
- D.
  
  Sense of joint movement.
Correct Answer
D. Sense of joint movement.

Explanation
The sense of joint movement is not an unconscious kinesthetic sensation because it is a conscious sensation. It refers to the ability to perceive the movement and position of our joints, which requires conscious awareness and attention. In contrast, the other options - sense of muscle tone, momentary state of muscle contraction, and muscle length - are all examples of unconscious kinesthetic sensations, as they are related to the perception of our muscles and their activity without conscious effort.

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6.

Regarding the cuneate pathway, which of the following is true:
- A.
  
  It transmits vibration sense.
- B.
  
  It transmits impulses from the inner aspect of the thigh.
- C.
  
  The crossing of the pathway fibers is mainly in the third order neuron.
- D.
  
  None of the above.
Correct Answer
A. It transmits vibration sense.

Explanation
The cuneate pathway is a sensory pathway that transmits information related to fine touch, vibration, and proprioception from the upper body to the brain. It is responsible for transmitting vibration sense, which is the ability to perceive vibrations. This pathway does not transmit impulses from the inner aspect of the thigh, as that is the role of the gracile pathway. The crossing of the pathway fibers occurs mainly in the second order neuron, not the third order neuron. Therefore, the correct answer is that the cuneate pathway transmits vibration sense.

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7.

Regarding thermal sensation, all the following is true except:
- A.
  
  Cold receptors can be stimulated above 45C.
- B.
  
  Hot pain receptors stimulated above 45C.
- C.
  
  Transmitted by dorsal column leminiscal pathway
- D.
  
  Temperature regulation is through hypothalamus
Correct Answer
C. Transmitted by dorsal column leminiscal pathway

Explanation
The dorsal column lemniscal pathway is responsible for transmitting fine touch, proprioception, and vibration sensations, not thermal sensations. Thermal sensations are transmitted through the spinothalamic tract. Therefore, the statement "Transmitted by dorsal column lemniscal pathway" is incorrect.

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Current Version
Mar 21, 2023

Quiz Edited by
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Nov 06, 2016

Quiz Created by
Gawadgawadgawad

Dr Gawad Physiology Course Online Exams – Mechanoreceptors, Thermoreceptors

Regarding the ventral spinothalamic tract, which of the following is not true:

Regarding the spinocerebellar, which of the following is true:

The gracile pathway:

Stereogenesis depends on the following except:

Which of the following is not an unconscious kinesthetic sensation:

Regarding the cuneate pathway, which of the following is true:

Regarding thermal sensation, all the following is true except: