Medicine

Midbrain

Located at the base of the brain we can find a small but very important region known as the midbrain, which serves as a vital connection point between the other major regions of the brain, the anterior brain and the posterior brain. The midbrain is the highest part of the brainstem, the central connection between the brain and the spinal cord. There are three main parts of the midbrain: the colicle, the segment, and the brain peduncles. Of the 12 cranial nerves, two join directly from the midbrain: the oculomotor motor and the trochlear nerves, which are responsible for the movement of the eyes and eyelids.

What is the midbrain?

It is a part of the brain known as the middle brain, made up of the brainstem, cerebellum, and diencephalon. It is located in the lower part of the brain mass and is responsible for the mechanical stability of the body.

Characteristics of the midbrain

The main characteristics of the midbrain are as follows:

Location

The midbrain is one of the main parts of the brain. It is located in the upper area, over the Varolio Bridge, and just below the diencephalon, and is a structure composed mainly of the thalamus and hypothalamus. It is the part of the brainstem that is closest to the center of the brain, while the bulge and the spinal bulb are more oriented toward the spinal cord.

Parts

The two parts that make up the midbrain are the following: the tectum and the tegmentum.

Tectum

It is located in the dorsal part of the midbrain, channeled towards the nape of the neck. The term etymologically means “roof”. All its functions are closely related to the automatic reactions to auditory and sonorous stimuli.

It is made up of two pairs of lumps, one on top of the other. These lumps are known as colliculus. The superiors play a very important role in the vision and orientation of the eyes with respect to visual stimuli. The lower ones are related to involuntary reactions to sounds

Tegmentum

It’s located in the ventral part of the midbrain. It contains three main zones, each of which is associated with a color: the black substance, the periacueductal grey substance and the red nucleus.

The black substance is a substance located in the upper part of the midbrain and its function is mainly associated with movements and muscle tone. The red nucleus has important functions in the body’s motor system and the grey substance is located around Silvio’s duct and participates in analgesic processes in general.

Function

The main function of the midbrain is to conduct and control motor impulses from the cerebral cortex to the junction of the spine and brain. It is responsible for generating all sensory impulses that are shown through the spinal cord.

There is a part in the midbrain known as the upper quadrigeminal tubers, which function is to generate the movements made by the ocular balls and which arise as a sensory response to stimuli originated by sight. The inner quadrigeminal tubers are in charge of recording the auditory stimuli and the different movements that we carry out with the head and that are related to them.

Diseases and injuries of the midbrain

Any type of injury to the human body that affects the brain can also damage the midbrain. When it is affected, it usually leads to coma and death. This is because it is related to the basic physiological functions of the organism and the nerve impulses of the neurons.

The main pathologies related to the midbrain are:

Written by Gabriela Briceño V.
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