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.
Sign up. Illustrated anatomical parts with images from e-Anatomy and descriptions of anatomical structures. Function: Provides motor innervation to the muscles of facial expression, posterior belly of the digastric muscle, stylohyoid muscle, andstapedius muscle.
CN VII is responsible for the movement of the facial muscles. Voluntary facial movements originate along with other motor activity in the precentral gyrus. White matter tracts pass through the internal capsule and cerebral peduncles along with the other corticobulbar fibers.
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 nerve arises in the ponsan area of the brainstem.
Facial nerve 7th cranial nerve palsy is often idiopathic formerly called Bell palsy. Idiopathic facial nerve palsy is sudden, unilateral peripheral facial nerve palsy. Symptoms of facial nerve palsy are hemifacial paresis of the upper and lower face.
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.
The facial nerve is one of the key cranial nerves with a complex and broad range of functions. Although at first glance it is the motor nerve of facial expression which begins as a trunk and emerges from the parotid gland as five branches see facial nerve branches mnemonicit has taste and parasympathetic fibers that relay in a complex manner. The facial nerve is the only cranial nerve that may show normal post-contrast enhancement, although this applies only to the labyrinthine segment up to the stylomastoid foramen.
Selected Topics in Facial Nerve Disorders. It innervates all superficial muscles of the face and scalp, the contraction of which is responsible for all our numerous facial expressions like anger, pain, fear, smile, etc. Facial disfigurement resulting from facial nerve disorders can affect the physical, psychological, and emotional integrity of an individual. This might result in social, occupational, and educational handicap.
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.