The temporal branch enters the undersurface of the frontalis muscle and lies superficial to the deep temporalis fascia. In cases in which the lateral canal is difficult to identify eg, cholesteatoma, tumor , the use of other landmarks, along with cautious exploration, is advised. The average distance between the point where the nerves exit the brainstem and the place where they enter into the internal acoustic meatus internal auditory canal [IAC] is approximately It is here that three branches originate:. In some cases, removing part of the promontory bone with a microdrill allows additional access. There was an error submitting your subscription.
The Facial Nerve (CN VII)
Of these, the facial nerve innervates 14 of the 17 paired muscle groups of the face on their deep side. The facial motor nuclei then send signals to the orbicularis oculi muscles of both eyes to contract via the temporal and zygomatic branches of the facial nerve. Brain Tumors Third Edition , Related terms: Injury to this branch will result in paralysis of mouth depressors. Within the petrous temporal bone, the following are the major branches relevant to clinical practice: Damage to any of these five branches would result in weakness or paralysis of the muscles supplied.
Facial Nerve - Anatomy Pictures and Information
The sensory fibers of the nerves draw alongside the chorda tympani via the intermedius part into the nucleus of the solitary tract. Rescue for Diabetes-Feet Treatment typically consists of steroids and antivirals. This is because a facial weakness is, rarely, the first indication of Lyme disease. The surgeon who relies inordinately on the facial nerve monitor is one who puts the patient and himself or herself at risk. The submandibular and sublingual salivary glands receive their parasympathetic innervation via the submandibular ganglion.
Immediately distal to this, motor branches are sent to the posterior belly of the digastric muscle and to the stylohyoid muscle. Two small branches innervate the stylohyoid muscle and posterior belly of the digastric muscle. Intracranial lesions occur during the intracranial course of the facial nerve proximal to the stylomastoid foramen. Also, you need to protect your eye if your eyelids cannot close see below. You have a facial nerve also called the seventh cranial nerve on each side of your face.