Upper motor neurons originate from the pyramidal cells of the precentral gyrus, with their fibers projecting caudally; a significant portion terminates in brainstem nuclei, while others form corticospinal tracts, most of which decussate in the lower medulla to form the lateral corticospinal tracts.
1. pyrimidal cells of precentral gyrus<div>2. Fibers project caudally</div><div>3. 19 million fibers ending in nuclei of the brainstem</div><div>4. 1 million forming the corticospinal tracts</div><div>5. most fibers decussate in lower medulla oblongata</div><div>6. form lateral corticospinal tracts on each side of the spinal cord</div>
| Front | What is the function of the upper motor neurons? |
|---|---|
| Back | 1. pyrimidal cells of precentral gyrus 2. Fibers project caudally 3. 19 million fibers ending in nuclei of the brainstem 4. 1 million forming the corticospinal tracts 5. most fibers decussate in lower medulla oblongata 6. form lateral corticospinal tracts on each side of the spinal cord |
Learn with these flashcards. Click next, previous, or up to navigate to more flashcards for this subject.
Next card: Motor lower neurons neurons? brainstem spinal cord fibers
Previous card: Region brain responsible sending commands muscles? precentral gyrus
Up to card list: Anki Anatomy, physiology, microbiology