Cranial nerve VII is the facial nerve. It supplies motor, sensory and parasympathetic innervation to various structures of the head and neck. In this article, we discuss the embryology, structure and course of the facial nerve and the brainstem nuclei associated with it.
Skip to main content. It is important to note that while the facial nerve branches within the parotid gland, it does not provide autonomic innervation to the gland This is supplied by the auriculotemporal division of V3. CN VII is often tested during physical examination and its function can be reported using the House-Brackmann Scale Hint: 1 is normal, 6 is completely non-functional.
It emerges from the pons of the brainstemcontrols the muscles of facial expression, and functions in the conveyance of taste sensations from the anterior two-thirds of the tongue. It arises from the brainstem from an area posterior to the cranial nerve VI abducens nerve and anterior to cranial nerve VIII vestibulocochlear nerve. The facial nerve also supplies preganglionic parasympathetic fibers to several head and neck ganglia.
In this article, we shall look at the anatomical course of the nerve, and the motor, sensory and parasympathetic functions of its terminal branches. The course of the facial nerve is very complex. There are many branches, which transmit a combination of sensory, motor and parasympathetic fibres.
The facial nerve and its branches regulate a number of functions of the mouth and face. Most of its divisions stimulate muscles that allow eyelids to open and close, as well as facial movements. This nerve also mediates the production of tears and saliva and perception of taste in the tongue, and receives some sensory input from the face as well.
The facial nerve is also known as the seventh cranial nerve CN7. This nerve performs two major functions. It conveys some sensory information from the tongue and the interior of the mouth.
Facial nervenerve that originates in the area of the brain called the pons and that has three types of nerve fibres: 1 motor fibres to the superficial muscles of the face, neckand scalp and to certain deep muscles, known collectively as the muscles of facial expression; 2 sensory fibres, carrying impulses from the taste sensors in the front two-thirds of the tongue and general sensory impulses from tissues adjacent to the tongue; and 3 parasympathetic fibres part of the autonomic nervous system to the ganglia groups of nerve cells governing the lachrymal tear glands and certain salivary glands. Facial nerve. Info Print Cite.
Definition The facial nerve seventh cranial nerveCN VIIlatin: nervus facialis is a mixed cranial nerve consisting of motor, sensory, and visceromotor fibers. The main functions of the facial nerve include controlling the muscles of facial expression, and providing taste sensations from the anterior part of the tongue. Functionally, the facial nerve consists of two parts: somatosensory and visceromotor part.