We appreciate your visit to Which of the following best indicates the location of lost contralateral facial muscle control after a corticobulbar tract stroke A Upper facial muscles B Lower. This page offers clear insights and highlights the essential aspects of the topic. Our goal is to provide a helpful and engaging learning experience. Explore the content and find the answers you need!
Answer :
The correct answer is option A. the location of lost contralateral facial muscle control after a corticobulbar tract stroke is primarily indicated by the affected upper facial muscles.
- The corticobulbar tract is a part of the motor pathway that controls movements of the face, mouth, and throat. It originates in the motor cortex and descends to synapse with cranial nerve nuclei in the brainstem.
- After a corticobulbar tract stroke, the pattern of facial muscle weakness depends on which part of the tract is affected.
- The upper facial muscles, including the frontalis and orbicularis oculi, receive bilateral innervation from both cerebral hemispheres.
- This means that even if one side of the corticobulbar tract is damaged, the upper facial muscles can still receive contralateral input from the undamaged side. Therefore, they typically retain some degree of function.
- In contrast, the lower facial muscles, including those around the mouth, receive contralateral innervation primarily from the corticobulbar tract of the opposite cerebral hemisphere.
- As a result, a stroke affecting the corticobulbar tract can lead to contralateral loss of control over the lower facial muscles.
- This results in weakness or paralysis on the opposite side of the face, affecting the ability to smile, pucker the lips, or perform other movements involving the lower face.
- The perioral and buccal muscles, which are involved in speech, are also typically affected on the contralateral side following a corticobulbar tract stroke, as they are controlled by the contralateral motor cortex.
- In summary, the corticobulbar tract stroke typically results in loss of contralateral control over the lower facial muscles (option B), while the upper facial muscles (option A) are less likely to be affected due to their bilateral innervation.
- Options C and D are incorrect because they do not accurately reflect the typical pattern of muscle weakness following a corticobulbar tract stroke.
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The area of decreased contralateral facial muscle control following a corticobulbar tract stroke is best indicated by the lower face muscles.
What is controlled by the corticobulbar tract?
The cranial nerves supplying the head and face get upper motor neuron innervation from the corticobulbar tract. A number of motor routes leave the primary motor cortex at the precentral gyrus, which is located in the back of the frontal lobe of the brain.
What symptoms might you have corticobulbar?
Muscular weakness, speaking difficulty, and difficulty moving the tongue show as upper motor neuron disease signs and symptoms when corticobulbar tract degeneration is present. The higher motor neurons of the cranial nerves make up the corticobulbar tract.
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