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The Hōzuki Clan aren't susceptible to Genjutsu; Genjutsu Immunity. Thesis Hōzuki Clan affiliates, through their Hiden (Literally meaning: Secret Tradition) are capable of liquefying themselves wholly; transmuting both external and internal obstruction (i.e. organs - The brain).
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Genjutsu is induced by taking control of the victim's cerebral nerves; sight, hearing, smell, taste, and touch. Changing the properties of human structure (e.g. a liquefied brain), rejects the basis of Genjutsu stipulation; the brain
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Extrospect Our 5 senses have their respective organs with specific and special cellular structures that are receptors of respective stimuli. These cells are linked to the nervous system and further with the brain. Cells sense at the initial level and this sensing is consolidated in the nervous system to create sensations. However, the smallest of sensations requires a billion nerve cells to fire prompt messages through the linked pathways to the brain, which then shoots out the corresponding response. To understand how all our 5 sense organs work, you need to understand the role the brain plays as the control which coordinates them and makes them compliment each other. Sight The Eye enables and facilitates vision. In structure, it has a transparent lens to focus light on the retina. The retina is covered with two types of cells − rods and cones. The cone cells are color- sensitive and are located in a part of retina called the fovea. The rod cells are light-sensitive and are located around the fovea − these are responsible for peripheral and night vision. The optic nerve connects the eye to the brain. This connection is called the ‘blind spot’ because it is insensitive to light. When the input is received by the brain, from both eyes, it combines them into a single, three-dimensional image. The retina creates an inverted image because of the focusing action of the lens but the brain does a further job by providing the right-side-up perception. Eyes have an exceptional range of perception. In darkness, the rod cells increase the eyes’ sensitivity to such a level that it becomes capable of detecting even a faint dim light. Conversely, in strong light the iris contracts, to reduce the size of the aperture in order to allow a reduced amount of light into the eye, to protect the light sensitive cells. VIBGYOR is the spectrum of light to which our eyes are sensitive. Hearing Our ears enable us to hear. The outer part of the ear is a cup shaped structure, which stands out from the sides of the head. This routes the sounds to the tympanic membrane, commonly known as the ‘ear drum’. The sound vibrations are then further transmnitted, through a chain of small bones in the mid ear − namely the malleus, incus and stapes − to the inner ear. The inner ear or cochlea is a a spiral-shaped chamber, covered internally with the nerve fibers. These fibers react to the sound vibrations and send the impulses to the brain via the auditory nerve. The brain consolidates the inputs received from both the ears and determines the direction and distance of the sound. A human ear is sufficiently sensitive to perceive sound from 16 cycles of frequencies per second to 28,000 cycles per second. This is a huge range comprising of a very high pitch to a very deep bass. A pitch change as small as one 300th of 1% of the original frequency can be read by a human ear. It has been found that, after the age of 7, we do not demonstrate a great deal of improvement in the ability to recognize notes. This is why it is said that note and pitch recognition lessons should be taught to children before they reach 4 years of age. Taste The taste sensors are called ‘taste buds’. The majority of these are located in the tongue, but they are also found in the upper part of the mouth and near the pharynx. They can detect the 4 basic tastes − salt, sweet, bitter, and sour. The sensitivity of the taste buds to particular tastes is divided into specific areas on the tongue: the tip of the tongue is sensitive to sweet tastes, taste buds at the back of the tongue are sensitive to bitter tastes, those on the top are sensitive to salt and those on the side of the tongue are sensitive to sour tastes. Every taste bud has a nerve beneath it, which sends sensations to the brain. The sense of taste and smell work in coordination. The number of taste buds and their distribution varies from individual to individual − the higher the number greater the sensitivity. Women, typically, have a higher number of taste buds. Smell The nose facilitates the sense of smell. The cavity of the nose has an inner layer of mucous membranes consisting of smell receptors which are connected to the olfactory nerve. A smell is comprised of vapors emanating from different substances. When these vapors strike the smell receptors, they interact with these molecules and transmit sensations to the brain. There are 7 main types of odors to which the smell receptors are sensitive; these can be segregated into camphor, musk, flower, mint, ether, acrid, or putrid. Whilst suffering from a cold, the sense of smell is commonly lost, temporarily. Touch Nerve endings are scattered throughout the surface of the skin and transmit sensations to the brain, thus allowing contact to be felt anywhere throughout the body. However, some areas of the body have a larger number of nerve endings, making them more sensitive than others – for instance there is a very high concentration of nerve endings on the lips, making them extremely sensitive to contact. We can identify 4 kinds of touch sensations: cold, warmth, contact, and pain. Hair on the skin magnifies sensitivity and acts as a warning system for the body. The fingertips and the sexual organs possess the highest concentration of nerve endings. Further: Extrospect We interact with the external world, through our senses. The brain has separate, dedicated areas to receive, interpret and respond to the input received from the sense organs: Smell− Multiple brain areas are involved: Smelling is not done by the nose alone, its perception and interpretation involves multiple areas of the brain. After receiving the smell sensation, the nose sends the signals to the olfactory bulb, thalamus and amygdale; this area is called the limbic system. From here, the signals travel to the temporal and frontal lobes. These areas perform the task of odour memory and discrimination. So much functioning and involvement of brain parts makes us understand, the difference between an odour and a fragrance. Taste & Odor− Their perception is interrelated: Taste sensations, received by the taste buds in the tongue, roof of the mouth and throat, reach the brain via the brain stem. Just like smell sensations, taste signals also travel to the limbic system From there the information goes to the frontal and temporal lobes, similar to the smell signals. The similarity and proximity of the brain pathways processing the taste and smell signals, demonstrate the connection between the two senses. Vision − The Occipital Lobe is significant and critical: Visual inputs are processed by the occipital lobe, situated at the back of the brain, via the optic nerves from the eyes. The occipital lobe coordinates with various parts of the brain to assist in vision related functions such as remembering people, places or objects previously seen, as well as emotional association with visual input received. Hearing − The Temporal Lobe Receive Input: The auditory cortex in the temporal lobe receives the sound input from the ear and interprets it. This communication between the auditory cortex, the frontal and parietal lobes of the brain, result in the recollection of sounds and their association with particular circumstances, as well as identifying the direction from which the a sound is being received. Sensations − The Parietal Lobe receives all Physical Sensations: It's the responsibility of the parietal lobe in the brain to perceive, identify and interpret all physical sensations, such as touch, temperature, texture, pain, pleasure, pressure, etc. The touch discrimination capability of different body parts is also different. Parietal Lobe The parietal lobe carries out some very specific functions. As a part of the cortex, it has a lot of responsibilities and has to be able to process sensory information within seconds. The parietal lobe is where information such as taste, temperature and touch are integrated, or processed. Humans would not be able to to feel sensations of touch, if the parietal lobe was damaged. TL;DR
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Due to the Hōzuki Clan's Hiden, Genjutsu is rendered ineffective on the premise: Sensory disruption cannot be attained (e.i. liquidized brain; water, does not contain cerebral nerves) - Lack of disruption within the five senses disables illusionary scenarios to be experienced; Suigetsu, and his clansmen are immune to Genjutsu. |
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