Tectospinal Tracts Anatomy

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Questions and Answers

What is the function of the lateral tectospinal tract?

  • Controlling voluntary muscle movements in the arms
  • Directing the eye and turning the head towards a light source (correct)
  • Directing the eye and turning the head towards a sound source
  • Regulating heart rate and respiration

Where does the ventral tectospinal tract originate from?

  • Globus pallidus
  • Inferior colliculus (correct)
  • Basal ganglia
  • Superior colliculus

Which structure provides projection fibers to the mentioned tract system?

  • Cerebellum
  • Globus pallidus (correct)
  • Hippocampus
  • Substantia nigra

What is the main function of the ventral tectospinal tract?

<p>Turning the head to direct the ears towards a sound source (D)</p> Signup and view all the answers

Which part of the spinal cord does the lateral tectospinal tract terminate in?

<p>Cervical segments (B)</p> Signup and view all the answers

Which reticular nuclei mainly excite the antigravity muscles?

<p>Pontine reticular nuclei (A)</p> Signup and view all the answers

Which reticulospinal tract inhibits the gamma motor neurons, thus inhibiting the stretch reflex?

<p>Lateral reticulospinal tract (C)</p> Signup and view all the answers

Where do most fibers of the lateral reticulospinal tract descend in?

<p>Same side of the spinal cord (B)</p> Signup and view all the answers

Which tract arises in the cells of the inferior olive of the medulla and is found only in the cervical region of the spinal cord?

<p>Olivospinal tract (A)</p> Signup and view all the answers

What is the function of the ventral reticulospinal tract?

<p>Facilitate gamma motor neurons (A)</p> Signup and view all the answers

Which set of nuclei function mainly antagonistically, where one excites antigravity muscles and the other relaxes them?

<p>Pontine and medullary reticular nuclei (C)</p> Signup and view all the answers

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Study Notes

Tectospinal Tracts

  • The lateral tectospinal tract terminates in the cervical region of the spinal cord.
  • The ventral tectospinal tract originates from the ipsilateral superior colliculus.

Reticulospinal Tracts

  • The pontine reticular nuclei mainly excite the antigravity muscles.
  • The medullary reticulospinal tract inhibits the gamma motor neurons, thus inhibiting the stretch reflex.

Lateral Reticulospinal Tract

  • Most fibers of the lateral reticulospinal tract descend in the ventrolateral funiculus.

Olivospinal Tract

  • The olivospinal tract arises in the cells of the inferior olive of the medulla and is found only in the cervical region of the spinal cord.

Ventral Reticulospinal Tract

  • The function of the ventral reticulospinal tract is to relax antigravity muscles.

Reticular Nuclei

  • The pontine and medullary reticular nuclei function mainly antagonistically, where one excites antigravity muscles and the other relaxes them.

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