Cranial Nerve VII – The Facial Nerve and How to Test Its Function

The 7th cranial nerve is primarily an electric motor nerve providing the muscle mass of face. The sensory element is little, it lugs preference feelings from the former 2/3rds of the tongue as well as cutaneous feelings from the former wall surface of the exterior acoustic canal.

The preference fibers are lugged by the linguistic nerve, which is a branch of the mandibular nerve as well as these fibers sign up with the chorda tympani. The electric motor center of the 7th nerve exists former as well as side to the abducens center in the reduced pons. The intrapontine fibers hook around the 6th nerve center to arise at the cerebellopontine angle, side to the corticospinal system. In addition to the acoustic canal via the interior acoustic neatus. Anterioly it flexes dramatically onward as well as downward, as well as at this angle exists the geniculate ganglion. Distally, the nerve departures via the stylomastoid foramen. Right away after its departure from the head, the nerve travels through the parotid gland, as well as triggers 5 branches to provide the orbicularis oculi, orbicularis oris, frnatalis, zygomatic muscle mass, buccinator, platysma as well as various other muscle mass of face. Within the face canal, simply distal to the geniculate ganglion, via the higher superificial petrosal nerve it provides the sphenopalantine ganglion which innervates the lacrimal glands as well as offers an additional branch to the stapedius muscular tissue, prior to being signed up with by the chorda tympani.


The individual needs to be asked to frown, crease his temple, climb his brows, shut his eyes securely versus resistance, withdraw the angle of his mouth, reveal his teeth, blow his cheeks as well as whistle, If there is trouble in any one of the above features, maybe compared to the healthy and balanced side. Additionally note for any type of crookedness of palpebral crevice as well as the nasolabial layer in the relaxing placement.

The experience of the former element of the exterior acoustic canal is examination wit cotton. Preference from the former 2/3rds of the tongue is checked making use of 4 typical tastes, as well as quinine. The tongue needs to be sticking out throughout the examination as well as the individual be sticking out throughout the examination as well as the individual need to not be permitted to talk. Words, wonderful, salt, sour as well as bitter are composed on a paper, as well as the topic is asked to indicate words that represents the preference he views. For the posterior third of the tongue, the very same products can be made use of for screening. As a different stimulation, galvanic current can be made use of. Face paralysis (Palsy) might be of the reduced electric motor nerve cell kind or top electric motor nerve cell kind.

Resource by Funom Makama

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