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Healthopedia

The eye and brain
Oct 31 '11

The Parts of the Eyes, Its Specific Roles and Locations

imageOur eyes do amazing things. It is through the different parts of the eyes that we can see the beautiful things that surround us every day of our lives. Do you ever wonder why we can see things like this? The eyes, no matter how small they can be are composed also of several different parts like which includes pupil, lens, vitreous humor, sclera, cornea, anterior and posterior chambers, iris, pupil, lens, fovea, and macula, and retina. Having a good vision means that these different functions play a very unique role in making us see things clearly and in order to maintain this we have to know each function to know how to protect our eyes from things that can be harmful.

The common parts of the eyes to most people are the cornea, pupil, retina, iris andimage lens.  These parts are always heard most of the time.  The cornea is the outer portion of the eyes which is transparent, clear and bulging.  The light enters the eyes through the cornea.   The retina on the other hand is found at the back of the lens and it serves as the screen wherein the images are actually formed.   The retina is made up of very sensitive cells which are directly connected to the optic nerves.   The part in which the light passes through to the lens is the pupil. It is at the center of the iris.

At the back of the cornea is the retina, one of the many parts of the eyes that direct the constriction and the dilation of the pupil.  The lens is transparent and elastic as well as convex which helps in the formation of the image in retina.  The vitreous humor, sclera, anterior and posterior chambers, fovea and macula are other parts of the eyes which are not so familiar with.   The sclera is the white portion of our eyes which is behind the cornea. The main function of the sclera is to protect the inner portion of the eyes. The transparent jelly-like space between the lens and the retina is the vitreous humor.

imageThe anterior and posterior chambers are also other parts of the eyes.  The anterior chamber which means front is the space between the cornea and the iris while the posterior chamber, which means the back, is the space between the iris and the lens.  The central fixation or the central of visual field is the when the retinal locus focuses on something.  The fovea is composed of cones with no rods, which means it is where you can see the responsible for color vision. It is thin, elongated and tightly packed.  The macula is a pigment that covers the fovea which serves a filter that absorbs blue and ultraviolet radiation.

The Essential Benefits of Maintaining Hypothalamus Proper Functioning

Our body is basically controlled by one main organ located on top, that is, ourimage brain. It is comprised of so many complex and delicate parts in order for the entire nervous system to work well. The hypothalamus proper functioning determines the proper functioning of the other parts of the brain, thus it should be taken care of and we must know how it generally affects our being.  The brain is composed of three very important parts and each part has several sub-parts which has also different functions and all of which are very important in our body. The hypothalamus basically belongs to the limbic system which is also called the “emotional brain”.

In order to know the hypothalamus proper functioning, we must first know where itimage is located in our brain.   The hypothalamus is an “almond size” part of the brain which is below the thalamus but above the brain stem.   Being the most important part of the limbic system, hypothalamus is considered as the brain’s brain because of the kind of functioning it possesses.   Indeed, it is a fact that it is because of the hypothalamus which makes us humans. It maintains the homeostasis in our body, it is in direct connection with our pituitary glands, it determines and controls our sleep and wake cycle, and other bodily desires such as thirst, emotions, appetite, and other autonomic and motor functions.

Our bodies’ wholesome disposition depends how well the hypothalamus proper functioning maintain its homeostasis is.  It is the hypothalamus that controls our body temperature, blood pressure, fluid balance and body weight.  Thus, once our hypothalamus is not functioning well, it will lead to the changing or imbalance of our body temperature and weight as well as in the occurrence of high blood pressure.  Since we simply do not know when the hypothalamus is experiencing some sort of malfunctioning that is why such imbalances occur, thus we often do not blame our hypothalamus for having such imbalances.  And since we already know it now then this can let us think that being an “emotional brain”, these imbalances will occur once our emotions are not stable.

Hypothalamus proper functioning could also be disrupted due to some instances in our life wherein the hypothalamus could interpret incorrectly some neuro-signals.   Once the hypothalamus is not functioning well, we can always feel such feelings as confusions, dissatisfactions, and emptiness within us that we can never fathom as to the reason why, and which to the extent will lead to depression.   Weak persons who cannot tolerate such emotional turmoil may end up being insane.   The heart, which we thought was responsible for our feeling, is not the one to let us recognize pain, love, and being angry but it is our hypothalamus. It is the one which tells us that we feel hungry, tired and sleepy.