Nerve 7th cranial - facial nerve and how its function test

By Funom Makama Funom Makama
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I am Dr. Funom Theophilus Makama (while still a student) pronounce I am a candidate for Cardio-thoracic surgeon and also I love to write. I write articles (especially...)

The seventh cranial nerve is a nerve predominantly engine provide the muscles of facial expression. The sensory component is small, brings taste sensations from the previous two-thirds of tongue and sensations skin of the anterior wall of the external ear canal.

Flavor fibers are transported by the lingual nerve, which is a branch of the mandibular nerve and these fibres to join the chorda timpani.The motor nucleus of the seventh nerve is anterior and lateral Abducens core Bridge lower Pons.Intrapontine hook the nucleus of sixth nerve fibres to emerge with the side to the corticospinal tract cerebellopontine angle. Along with the ear canal of the neatus auditory interna.Anterioly bends sharply forward downwards and in this angle is geniculado.Metacarpalia ganglion, nerve exits through the hole of stylomastoid.Immediately after his departure from the skull, the nerve passes through the parotid and gives rise to five branches to supply the orbicularis oculi, orbicularis oris frnatalis muscles zygomatic, buccinator, platysma and other muscles facial.En expression facial, only distal to the geniculate on superificial ganglion sphenopalantine which innervates the lacrimal glands and gives muscle estapedio, another branch that provides greater petrosal nerve ganglion channel before they joined the chorda timpani.

Testing

The patient must be ordered to frown, crush his brow, increasing their eyebrows, close their eyes firmly against the resistance, the angle of the mouth shrink, showing its teeth, blow his cheeks and whistle, if there is difficulty in any of the above functions, could compare with the healthy side. Also note any asymmetry of palpebral fissure and furrows in the rest position lid.

The sensation of the previous appearance of the external auditory canal is cotton proof ingenuity.Taste of the previous two-thirds of tongue is tested through 4 joint tastes and quinine.Language must be protrude throughout the test and the patient may protrude from the test and the patient should not be allowed to speak.Words, sweet, salt, sour and bitter are written on paper, and item is prompted to select the word meaning perceived taste.The third back of the tongue, the same material can be used for testing.As an alternative stimulus, you can use the current facial galvanica.Paralisis (paralysis) may be the type of motor neuron upper or lower motor neuron.

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Article sent on: November 11, 2010