Diseases

Facial paralysis: when the face freezes

The face is not only the seat of all the expressions but it is also the first thing that one notices in his interlocutor. This is why facial paralysis impresses and worries as much. Yet in the majority of cases, she is cured without leaving behind.

There are different conditions that can lead to facial paralysis, but before we review them, let's see how the face is the scene of such diverse expressions.

It is the brain that is the conductor. It is assisted by other structures, including the brainstem just below it, from which twelve pairs of nerves, called peripheral nerves (or cranial pairs), leave. The seventh pair, VII or facial nerve, reaches the level of the face. It controls for each side, the muscles that control the expressions but also other events such as the production of tears or the taste of food.

Two forms of facial paralysis are mentioned:

  • Peripheral facial palsy (related to the nerves leaving the brainstem)
  • Central facial paralysis (linked to the brain)

PFP or peripheral facial palsy occurs when one of the nerves of pair VII undergoes injury. Since there are two nerves VII, one of them goes from the brain stem to the left side while the other goes to the right side. This explains why facial paralysis is on the side of the damaged nerve.

Central facial palsy is a result of an attack of part of the brain. Knowing that the latter is composed of two hemispheres, each one controls the opposite part of the body. In this case, if it is the left side of the brain that is damaged, it is the right side of the face that will undergo facial paralysis and vice versa.

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Read also :

> The nervous system: anatomy and functioning
> The brain tumor
> All about neurological diseases

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