The choroid comprises the largest part of the middle eye skin and is located between the retina and the sclera. The main function of the skin, which is rich in small and large blood vessels, is to supply the eye, especially the retina, with blood and oxygen. Typical diseases of the choroid include inflammation of … Choroid: Structure, Function & Diseases
The human eye, unlike some animal eyes, is dependent on light for its function. The less light that surrounds us, the less shapes and outlines can be perceived. The more light that enters our eye, the more colorful and clear the world around us becomes. For this reason, the human eye has the mechanism of … Bright Adaptation: Function, Tasks, Role & Diseases
Synonyms in a broader sense visual hole Definition The pupil forms the black center of the colored iris. It is through this iris that light enters the eye and travels to the retina, where it leads to the signal transduction that is responsible for the creation of a visual impression. The pupil is variable in … Pupil
How big are the human pupils? The size of the human pupil is relatively variable. One of the most important influencing factors is the brightness of the environment. During the day, the pupil has a diameter of about 1.5 millimeters. At night or in darkness the pupil widens to a diameter of eight to even … How big are the human pupils? | Pupil
Pupillary Reflex The adaptation of the pupil to the prevailing light situation is achieved by the so-called pupillary reflex. A distinction is made between the part that receives the information about the exposure and transmits it to the central nervous system (afference) and the part that, after processing this information, leads to the activation of … Pupillary Reflex | Pupil
What can dilated pupils indicate? In darkness, the pupils are dilated to allow as much light as possible to enter the eye. The so-called sympathetic nervous system dilates the pupils. It is particularly active during stress reactions and also increases pulse and blood pressure, for example. In stressful situations, the pupils can dilate accordingly. A … What can dilated pupils indicate? | Pupil
What does “isokor” mean at the pupil? Pupils are called isocor if their diameter is about the same on both sides. Slight side differences of up to one millimeter are still called isocor.Larger differences are no longer isocor, such a state is called anisocor. Since anisocor is an important symptom in a number of diseases, … What does “isokor” mean at the pupil? | Pupil
Synonyms in a broader sense Medical: Corpus vitreum Definition The vitreous body is a part of the eye. It fills a large part of the posterior chamber of the eye and is primarily responsible for maintaining the shape of the eyeball (bulbus oculi). Changes to the vitreous body can lead to visual disturbances in the … Glass body
What is meant by histogenesis? What is its purpose? What ailments or diseases can result from misdirected histogenesis? This question will be answered in the following article. What is histogenesis? Histogenesis describes the embryonic development of differentiated tissues with various tasks and functions by a genetically anchored program. This differentiated tissue arises from the undifferentiated … Histogenesis: Function, Tasks, Role & Diseases
The blood-ocular barrier consists of the blood-retinal barrier as well as the blood-aqueous barrier and corresponds to a physiological barrier for defense against pathogens and maintenance of biochemically different milieus. Disorders of the blood-retinal barrier cause fluid accumulation in the retinal area, which can lead to retinal detachment. Most commonly, diabetes mellitus causes blood-ocular barrier … Blood-ocular Barrier: Function, Role & Diseases
The ciliary ganglion is located on the optic nerve at the back of the eyeball. Parasympathetic fibers innervate the ciliary muscle, the pupil constricting sphincter pupillae muscle, and the inner eye muscles. Lesions in the ciliary ganglion can lead to failure of the eyelid closure reflex; ganglion blockers act nonspecifically to counteract overexcitation in the … Ciliary Ganglion: Structure, Function & Diseases
In medicine, melanocytes are the pigment-producing cells in the basal cell layer of the skin. They synthesize melanins, which give skin and hair their color. The best-known disease related to melanocytes is black skin cancer. What are melanocytes? Melanocytes migrate out of the neural crest during the embryonic developmental phase and thus into the skin … Melanocytes: Structure, Function & Diseases
