Which are the two main divisions of the nervous system?

Is used to refer to the nervous tissue that has a darker appearence, this area contains a large number of neuronal bodies and few myelinated fibers.

Is mainly formed by myeliminated nerve fibers. This area is found in the depth of the brain or on the surface, in the case of the spinal cord.

They have a great diversity of shapes and sizes. The fundamental parts of the neurons are soma or cellular body, and its prolongations, which can be axons or dendrites.

This are the prolongations of the neurons, they can be unique, but some neurons can host hundreads of them.

Are specialized sites that mediate communication between neurons, and there are two types, chemical and electrical.

It's main function is to connect the central nervous system with the lymbs and organs.

Is the most frequent cause of dementia worldwide, and is characterized by the progressive loss of memory for recent events. It is common in individuals older than 65.

Is made up of groups of cells that form glands isolated in the epithelium of the respiratory and digestive system.

It is located in the sella turcica, a cavity at the base of the skull. This gland is connected to the hypothalamus. It consists of an anterior lobe and a posterior lobe.

It receives nervous innervation that connects the gland with the photoreceptor cells of the retina.

They are small glands located in the upper part of each kidney; they produce essential hormones for life, including sex hormones and cortisol.

Is a heterocrine gland, has about 14 centimeters long and is located in the abdomen. It helps with the digestion of fats , carbohydrates and protein in food, and finally, it produces insulin for the regulation of blood sugar concentration.

It is a disease in which the sugar levels in the blood (glucose) are too high or too low.

Is responsible for producing the gametes or sex cells that will give rise to a new being.

Are even organs with the size of an almond that are responsible for the production of female gametes, as well as for the synthesis and secretion of female sex hormones, estrogen, and progestorone.

Are even organs located in the anterior part of the thorax. Milk-proding cells are organized here.

Are even organs located in the scrotal bags that keep them out of the abdominal cavity. These organs are covered by a fibrous layer called tunica albuginea, and testosterone is also produced here.

Is caused by the bacterium "Treponema pallidium", and its contagion is not only by sexual transmission but also by blood transfussions from infected donors.