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There are some abundant questions advancing in to Ask a Scienceblogger! If you (or your kids?) accept a catechism you appetite answered by a scienceblogger bead by Page 3.14 (the blog of the SB overlordz) and leave your catechism in the comments on this post.

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Tyler asked:

It’s said that the larboard hemisphere of the academician controls the appropriate bisected of the anatomy and carnality versa. Does this administer to the processing of audio and beheld bang of the aerial and eyes as well? Does the larboard bisected of the academician action what the appropriate eye sees and carnality versa?

There’s absolute a few questions in here, so let’s breach this afar into what I apperceive the questions (and assumptions) to be:

Let’s abode anniversary of these separately.

When it comes to initiating motor actions, does anniversary hemisphere of the academician ascendancy the adverse ancillary of the body?

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and

When it comes to concrete sensations (i.e. touch), does anniversary hemisphere of the academician accept signals from the adverse ancillary of the body?

If you’ve anytime looked at account of a academician afore (or, if you’re lucky, a absolute brain), you apparently apperceive that aback there’s a lot of academician to fit into the skull, it’s all bankrupt into itself. By actuality so folded, the apparent breadth of the academician can access after essentially accretion the all-embracing aggregate of the brain. The arched genitalia of the folds are alleged gyri (singular, gyrus). The gyri are afar by attenuated grooves alleged sulci (singular, sulcus).

The precentral gyrus is additionally accepted as the motor case or primary motor area, because its action is the beheading of autonomous movements. The motor case controls the added than six hundred anatomy complex in autonomous movements, and can be begin at the rear of the aboveboard lobe, aloof in advanced of the axial sulcus. Those six hundred anatomy are controlled by 31 analgesic nerves.

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The postcentral gyrus is additionally accepted as the somatosensory cortex, or primary acoustic area, because it receives acoustic ascribe from the body. The somatosensory case can be begin at the advanced of the parietal lobe, aloof abaft the axial sulcus.

The acoustic and motor cortices are absolutely awful organized – anniversary allotment of it corresponds to a specific allotment of the body, and the admeasurement of the breadth adherent to anniversary allotment of the anatomy depends on the complication of the movements that are agitated out, or the sensations processed, by that anatomy part. What that agency is that the allotment of the motor case that controls the fingers is way bigger than the allotment of the motor case adherent to the torso, alike the your anatomy is way bigger than your fingers. Likewise, the breadth of the acoustic case that processes awareness from your aperture is bigger than the allotment that processes awareness from your feet, alike admitting your anxiety are bigger than your lips.

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So if you adjudge you appetite to move your appropriate arm, or your appropriate leg, the arresting would leave the motor case of the larboard hemisphere, biking bottomward appear your brainstem, and afresh at the akin of the medulla, it would decussate, or cantankerous over to the appropriate ancillary of the brainstem, and afresh abide into your analgesic cord. Additionally if you capital to move your larboard arm, the arresting would leave your appropriate hemisphere’s motor cortex, bisect at the akin of the medulla, and afresh abide in the larboard ancillary of your analgesic cord. So if you burst a assumption array beneath the akin of the medulla that you knew to be complex in the beheading of motor commands, afresh the ancillary of your anatomy that would become bedridden would be ipsilateral – the aforementioned ancillary of the anatomy in which the bane occurred. However, if you had a bane college in your brainstem, aloft the akin of the medula, or if you suffered a achievement that afflicted allotment of your motor cortex, afresh the afflicted allotment of the anatomy would be contralateral – the adverse ancillary of the anatomy as the lesion. The aforementioned arrangement is accurate for the somatosensory case as well.

So broadly, Tyler was correct, the appropriate motor and acoustic strips ascendancy the larboard ancillary of the body, and carnality versa. But, there are some exceptions, aback it comes to the twelve cranial nerves.

Almost all of the cranial fretfulness accept mutual innervation. This agency that both the larboard and appropriate associates of a brace of cranial fretfulness are innervated by the motor case of both the larboard and appropriate hemispheres. The back-up is a assurance mechanism. If there was a bane on alone the larboard ancillary of the brain, both abandon of the anatomy areas affiliated to cranial fretfulness would abide to accept motor letters from the appropriate hemisphere. The arresting would not be as able as it was before, but this prevents abounding paralysis.

There are additionally two exceptions to this exception: cranial assumption 12 that controls the anatomy that acquiesce you to stick out your tongue, and allotment of cranial assumption 7 that controls the anatomy of your lower face both accelerate and accept signals to the adverse hemisphere, like the blow of the body.

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Does the audition ascribe into the larboard ear get candy by the appropriate hemisphere? Does the ascribe into the appropriate ear get candy by the larboard hemisphere?

In general, as with the blow of the body, it is accurate that the primary audition case of anniversary hemisphere processes ascribe from the adverse ear. So sounds advancing into the larboard ear are candy by the appropriate hemisphere, and carnality versa. The primary audition case can be begin on the apparent of the banausic lobes.

However, that’s alone a simplified diagram. If you go aback and appraise amount 5, above, you’ll apprehension that the signals from the aerial are agitated by cranial assumption eight, the vestibulocochlear nerve, which controls the close ear, and cranial assumption ten, the vagus nerve, which controls, amid added things, the alien ear. Aback cranial fretfulness acquaint with both the larboard and appropriate hemispheres, afresh the primary audition cortices do accept ascribe from both ears, admitting best of the ascribe is from the contralateral ear. Again, this is advised as a assurance mechanism. If there was a bane affecting alone the larboard audition cortex, the appropriate ear would not become absolutely deaf.

Does the beheld ascribe from the larboard eye get candy by the appropriate hemisphere? Does the ascribe from the appropriate eye get candy by the larboard hemisphere?

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Here is area I anticipate things get interesting. If you’ve been advantageous attention, you’ll bethink that anniversary of the cranial fretfulness (with exceptions) acquaint with both the appropriate and larboard hemispheres, clashing the analgesic nerves, which acquaint with adverse hemispheres. So the quick acknowledgment is that beheld advice from anniversary of the optic fretfulness (cranial assumption 2), gets candy by both hemispheres.

But let’s attending a little afterpiece at the optic nerves.

If you audit the image, you’ll apprehension that anniversary eye sends abstracts from the retina aback to both hemispheres, so that the appropriate beheld case processes abstracts from both the appropriate and larboard eyes, as does the larboard beheld cortex. Some of the fretfulness bisect (cross) at the optic chiasm, but some of them don’t. It absolutely gets a little bit added complicated.

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Each of your eyes, and appropriately anniversary of your retinas (which is the allotment of the eye that receives the beheld input), can be breach in half: the banausic part, which is on the outside, (the appropriate allotment of your appropriate retina, and the larboard allotment of your larboard retina), and the nasal part, which is on the inside, a your adenoids (the larboard allotment of your appropriate retina, and the appropriate allotment of your larboard retina).

Notice that the ablaze advancing into your eyes from the larboard bisected of the arena interacts with the banausic allotment of the appropriate retina, and the nasal allotment of the larboard retina. The ablaze advancing at your eyes from the appropriate bisected of the arena stimulates the banausic allotment of the larboard retina, and the nasal allotment of the appropriate retina.

When the fretfulness partially bisect beyond the optic chiasm, the acoustic ascribe from the larboard bisected of the beheld acreage combines and continues into the appropriate hemisphere. The acoustic ascribe from the appropriate beheld acreage combines and continues into the larboard hemisphere. So anniversary hemisphere doesn’t action beheld ascribe from the adverse retina, but from the adverse beheld field. The appropriate beheld field, initially breach beyond both of your eyes, combines and gets candy by the larboard beheld cortex. The larboard beheld acreage additionally gets candy by the appropriate beheld cortex.

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