What Is Cn Vii?

Facial Nerves

The facial nerve goes from the brain stem to the fossa and then to the temporal bone. The nerve runs through the facial canal into the labyrinthine, tympanic, and mastoid segments. The second bend in the facial nerve is called the pyramidal eminence.

The nerve that goes to the stapedius muscle and the tympani goes in the temporal part of the facial canal. The taste fibers of the anterior two thirds of the tongue are supplied by the tympani. The submandibular ganglion has postsynaptic fibers.

The facial nerve has cell bodies in the nucleus or ganglia. The taste sensation is caused by the cell bodies for the afferent nerves. The superior salivatory nucleus contains the cell bodies for the parasympathetic efferent nerves.

The facial nerve and the orbicularis oculi muscle

The facial nerve has general sensory fibers that transmit signals to the brain from the external acoustic meatus and the skin over the mastoid and pinna. The facial nerve has special sensory fibers that send taste information from the anterior two-thirds of the tongue. The nerve that leaves the facial nerve above the foramen is called the tympani and it is responsible for sending taste sensation from the two-thirds of the tongue.

It crosses the malleus and emerges at the end of the fissure. It is part of the lingual nerve at an acute angle and carries taste fibers for the anterior two-third of tongue. The orbicularis oculi muscle is one of the muscles in the orbital group.

The corrugator supercilii muscle pulls the eyebrows downward. The orbicularis oculi muscle has two parts. The palpebral part is responsible for closing the eyes.

The anterior, superior, and posterior auricular muscles are the ones innervated by the facial nerve. The anterior, superior, and posterior auricular muscles lift the ear. Weakness or paralysis of the muscles on the entire ipsilateral side of the face are caused by weakness at the level of the Geniculate ganglion.

The anterior two-thirds of the tongue are likely to be affected because the facial nerve has not yet branched off. Young children are more likely to have facial nerve paralysis. The most common cause of otitis media is the gram-positive Streptococcus pneumoniae, and most cases resolve with antibiotics.

Tic Douloureux and Weak Tongue Movement

The signals are sent to the superior ganglion of the glossopharyngeal nerve when stimulation of A-delta and C fibers is occurring. The signals are transmitted via interneurons to the nucleus ambiguus, the origin of the limb of the reflex. The stypharyngeus muscle and the pharyngeal constrictor muscles are innervate by the stypharyngeus nerve and the vagus nerve.

tic douloureux is a painful condition caused by irritation of the trigeminal nerve. It can happen due to a variety of reasons. The trigeminal nerve branch that is associated with trigeminal neuralgia tends to be located on the ipsilateral side of the face.

The constellation of symptoms is dependent on whether the lesion is in the rostral or caudal regions of the pons. The symptoms of the pons and their associated clinical presentations are often referred to as Gubler syndrome, or Miller- Gubler syndrome, but basilar pontine lesions specifically involving the trigeminal root may also be referred to as mid pontine base syndrome. Weak tongue muscles can be caused by pressure to the hypoglossal nucleus or nerve, leading to deviation of the tongue toward the side of the lesion.

The pharyngeal muscles, the muscles of the palate, and the vocal muscles can be weakened by pressure or damage to the nucleus ambiguus. If the vestibular nuclei are damaged, and the pressure on the spine is increased, it can cause a loss of pain and temperature sensation the ipsilateral face. The trigeminal ganglia can be affected by the virus in people with a history of chickenpox.

The shingles can be caused by the virus periodically reactivateing. It appears in a distribution. Those who are elderly or have immune compromised are more likely to have shingles.