Where do the axons that enter the cortico-spinal tract originate? (The complete answer should include more than one of Brodmann’
s areas.)
1 answer:
Answer:
<u>From the main motor cortex, Brodmann region 4 premotor areas and the primary somatosensory cortex .</u>
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Explanation:
The corticospinal tract originates in many regions of the brain, including
- the motor regions,
- main somatosensory cortex
- pre-motor regions
The corticospinal tract allows for voluntary control of motor functions.
30% of the neurons in the corticospinal regions are found in the primary motor cortex. 40% are split up in several regions; the parietal lobe, somatosensory cortex and the cingulate gyrus.
The axon is a tube enclosed in and insulated by the myelin sheath. It serves as a link to impulses for certain neurons that often comprise axon hillocks that are junctions between the axon and the cell body.
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The correct answer would be the harmless bacteria had been transformed.
Griffith used two different strains of the bacteria <em>Streptococcus pneumoniae - </em>type-III-S or smooth strain and type II-R or rough strain.
Smooth strain had protective covering around itself (protect itself from hosts's immune system) and was able to kill the mice.
Rough strain did not have any protective covering around itself and thus could be easily removed by the immune system Hence, it was not able to kill the mice.
In addition, heat killed smooth strain was also not able to kill the mice. However, when remains of it was added with rough strain then the blend was able to kill the mice.
Lastly, he was able to isolate living bacteria of both the strains.
He concluded that non-lethal type II-R strain was transformed into lethal type II-S strain by "transforming principle" (which we know today as DNA) that was supposed to be the part of dead III-S strain bacteria.
