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Questions and Answers
What is the function of the lateral tectospinal tract?
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?
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?
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?
What is the main function of the ventral tectospinal tract?
Which part of the spinal cord does the lateral tectospinal tract terminate in?
Which part of the spinal cord does the lateral tectospinal tract terminate in?
Which reticular nuclei mainly excite the antigravity muscles?
Which reticular nuclei mainly excite the antigravity muscles?
Which reticulospinal tract inhibits the gamma motor neurons, thus inhibiting the stretch reflex?
Which reticulospinal tract inhibits the gamma motor neurons, thus inhibiting the stretch reflex?
Where do most fibers of the lateral reticulospinal tract descend in?
Where do most fibers of the lateral reticulospinal tract descend in?
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?
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?
What is the function of the ventral reticulospinal tract?
What is the function of the ventral reticulospinal tract?
Which set of nuclei function mainly antagonistically, where one excites antigravity muscles and the other relaxes them?
Which set of nuclei function mainly antagonistically, where one excites antigravity muscles and the other relaxes them?
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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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