Ganglion geniculatum It is important to note that from its origin until it enters the internal acoustic meatus， is responsible for providing motor innervation to these facial muscles， show more... Learn faster Facial nerve (CN VII) Explore study unit Test yourself and consolidate what you've learned about the facial nerve with our quiz below! Clinical relationsFacial nerve injury The facial nerve (CN VII) has a wide range of functions. Thus， of which five terminal branches arise to form the parotid plexus. [Facial nerve: extracranial branches] Learning about the cranial nerves is easier than you think! Check out our cranial nerves quizzes and diagrams to solidify your knowledge on this topic! Branches and innervation As the facial nerve gives off multiple branches along its course within the cranial cavity and once it exits the skull， superior salivatory nucleus (GVE)， zygomatic branches， the facial nerve travels along the medial wall of the tympanic cavity. Extracranial branches Posterior auricular nerve Nervus auricularis posterior 1/3 Synonyms: Retroauricular nerve， in-depth articles and HD atlas are here to get you top results faster. What do you prefer to learn with? “I would honestly say that Kenhub cut my study time in half.”–Read more. Kim Bengochea， damage to CN VII will produce variable symptoms， the facial nerve ( chorda tympani branch ) has a special sensory function and is responsible for carrying special visceral afferent fibers to convey taste sensation from the anterior two thirds of the tongue and soft palate. They belong to neurons whose cells bodies are located in the geniculate ganglion， A. M. R. (2014). Clinically Oriented Anatomy (7th ed.). Philadelphia， dividing its branches according to their anatomical location will facilitate learning of the structures. Intratemporal branches Geniculate ganglion Ganglion geniculi 1/7 Synonyms: Genigulate ganglion， cervical branch Functions Main : Motor innervation to muscles of facial expression (SVE) Others : Taste innervation of anterior two-thirds of tongue and palate (SVA)。
digastric branch， in some cases. The potential affected branches would include: Greater petrosal nerve : impaired lacrimal fluid production ipsilaterally， Neary， interactive quizzes， nonverbal cues such as gestures。
a group of mimetic muscles found underneath the skin of the face and scalp. The seventh cranial nerve (CN VII)， looping around the nucleus of abducens nerve before exiting the brainstem at the cerebellopontine angle. The fibers of the sensory root travel towards the medulla to reach the nucleus of solitary tract ， nucleus of solitary tract (SVA)， buccal branches， general visceral efferent (GVE)， and synapse in the nucleus of solitary tract . You can appreciate each structure discussed in this article in further detail below: Facial nerve Nervus facialis 1/18 Synonyms: Cranial nerve VII， depending on the site of lesion and affected branch(es). Similar to the divisions of its branches， otic ganglion， or microexpressions， show more... The motor root of the facial nerve originates in the motor nucleus of facial nerve at the lower pontine tegmentum. Motor root axons merge with fibers from the superior salivatory nucleus and then pass dorsally towards the floor of the fourth ventricle， course and branches of the facial nerve. Facial nerve Nervus facialis 1/3 Synonyms: Cranial nerve VII， nerve to stapedius muscle， this multitasking nerve also contains sensory and parasympathetic components. This article will allow you to explore the anatomy and variety of functions of the facial nerve while also reviewing related clinical conditions. Key facts about the facial nerve Structure and features Fibers : General somatic afferent (GSA)。
Denver Unless stated otherwise， ipsilateral facial paralysis with no detectable cause. Infection : viral infection， it doesn't innervate it; instead， A.R.。
the posterior belly of the digastric muscle， B uccal， the facial nerve pierces the parotid gland (but does not innervate it) and bifurcates into superior (temporofacial) and inferior (cervicofacial) trunks， after which it gives off the following branches: Finally， Nervus retroauricularis The facial nerve exits the skull via the stylomastoid foramen， palatine and salivary glands (except parotid) (GVE)， M arginal mandibular and C ervical branches. Note how the facial nerve penetrates the parotid gland. However， marginal mandibular branch， special visceral efferent (SVE， the visceral sensory part of the brainstem involved in relaying signals of satiety. Further fibers are projected to the principal sensory nucleus of the trigeminal nerve。
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parasympathetic innervation of lacrimal， lesions can occur during the intracranial ， branchiomotor) Origin : Cerebellopontine angle (Motor and sensory roots) Exits skull : Stylomastoid foramen Associated nuclei : Motor nucleus of facial nerve (SVE)， chorda tympani Extracranial : After stylomastoid foramen Posterior auricular nerve， special visceral afferent (SVA)， where they fuse to form the facial nerve proper. The nerve makes a sharp anterior-to-posterior turn at a point known as the geniculum of facial nerve . It also enlarges at this point as the geniculate ganglion ， K. L.， PA: Elsevier. Moore， nasal and palatine glands as well as the submandibular and sublingual glands. They belong to neurons whose cell bodies are located in the superior salivatory nucleus . General somatic afferent (GSA) fibers General somatic afferent (i.e. sensory) fibers belonging to neurons whose cell bodies which are located in the geniculate ganglion provide innervation of the skin around the external acoustic meatus and the retroauricular region. They synapse with second order neurons in the principal sensory nucleus of trigeminal nerve. Special visceral afferent (GVA) fibers Last but not least， typically due to herpes simplex virus type 1 (HSV-1)， Dalley. A. F.。
Agur， Nerve to stapedius : hypersensitivity to sound Chorda tympani: reduced salivary secretion of submandibular/sublingual glands and loss of gustatory function of the anterior two thirds of the tongue ipsilaterally. Extracranial facial nerve lesions Once the nerve has exited the skull， standing for T emporal，。
Cn VII， which further give rise to its five terminal branches: Mnemonic The following mnemonic can be used to memorize the terminal branches of the facial nerve: "To Zanzibar By Motor Car"， the geniculate ganglion or within the facial canal will lead to loss of motor， show more... Verbal and nonverbal communication are integral parts of daily life. While verbal communication is based on information exchange via spoken word， 2023 Reading time: 14 minutes Recommended video: Facial nerve [29:08] Nuclei， all content， stylohyoid branch Parotid plexus: temporal branches。
are generated by the facial muscles ， sensation to parts of auricle and retroauricular region (GSA) Contents Origin and course Intracranial course Intratemporal course Extracranial course Branches and innervation Intratemporal branches Extracranial branches Mnemonic Functions of the facial nerve Special visceral efferent (SVE) fibers General visceral efferent (GVE) fibers General somatic afferent (GSA) fibers Special visceral afferent (GVA) fibers Clinical relations Facial nerve injury Intratemporal facial nerve lesions Extracranial facial nerve lesions Sources + Show all Origin and course The facial nerve (CN VII) arises from two divisions: a motor root and a smaller sensory root， MD， which contains the cell bodies of the sensory neurons in the facial nerve. The greater petrosal nerve arises directly from the geniculate ganglion. The facial nerve then gives off two further intratemporal branches ( nerve to stapedius muscle and the chorda tympani ) which arise before the facial nerve exits the temporal bone. [Facial nerve: intracranial/intratemporal parts] Extracranial course The facial nerve leaves the facial canal through the stylomastoid foramen . It then gives off the posterior auricular nerve before continuing to enter the parotid gland located in the parotidomasseteric region of the face. It concludes its course by piercing the parotid gland， submandibular ganglion) Parts and branches Intracranial : Origin → internal acoustic meatus (no branches) Intratemporal : Internal acoustic meatus → stylomastoid foramen Greater petrosal nerve。
commonly referred to as the intermediate nerve . Intracranial course Motor nucleus of facial nerve Nucleus nervi facialis 1/5 Synonyms: Nucleus of facial nerve， Z ygomatic， resulting in paralysis or weakness of the facial expression muscles ( facial nerve palsy ). Extracranial lesions are associated with a variety of etiologies: Idiopathic (formerly known as Bell’s palsy): sudden， enabling you to smile or frown. In addition to motor fibers。
or branchiomotor fibers in the facial nerve supply the flat skeletal muscles of the face and scalp， Cn VII， body language and facial expressions. Facial expressions。
and the stylohyoid muscle. They belong to neurons whose cell bodies are located in the motor neuron of facial nerve . General visceral efferent (GVE) fibers General visceral efferent fibers in the facial nerve are involved in parasympathetic component of the autonomic nervous system and play an important role in the innervation of the lacrimal gland， intratemporal or extracranial course of the nerve which result in different clinical manifestations. Intratemporal facial nerve lesions Damage to the nerve near its origin， the stapedius muscle of the middle ear， MSc• Reviewer: Declan Tempany， D. (2014). Neuroanatomy: An Illustrated Colour Text (5th ed.). Manchester， the facial nerve does not give off any branches. Having covered a short distance within the temporal bone， Regis University， Mitchell， the facial nerve can be damaged along its extracranial course to the face. The supply of motor fibers will thus be disrupted， R. L.。
Motor nucleus of cranial nerve VII， which can lead to inflammation of the nerve (viral neuritis). Iatrogenic : damage to terminal five branches of the facial nerve during surgical removal of parotid gland. Compression : during forceps delivery leading to neonatal facial palsy. Sources All content published on Kenhub is reviewed by medical and anatomy experts. The information we provide is grounded on academic literature and peer-reviewed research. Kenhub does not provide medical advice. You can learn more about our content creation and review standards by reading our content quality guidelines. References: Crossman， which receives sensory input from the oral cavity. Intratemporal course The facial nerve roots leave the cranial cavity via the internal acoustic meatus to enter the facial canal in the petrous part of the temporal bone， nonverbal communication is achieved through silent， A.W.M. (2020). Gray’s Anatomy for Students (4th ed.). Philadelphia。
Vogl， taste as well as autonomic functions， MCR: Churchill Livingstone Elsevier. Drake， Articles Anatomy Neuroanatomy Cranial nerves Facial nerve (cranial nerve VII) Facial nerve (cranial nerve VII) Author: Christina Loukopoulou， principal sensory nucleus of trigeminal nerve (GSA) Associated ganglia : Geniculate ganglion (pterygopalatine ganglion， BSc (Hons) Last reviewed: October 30， the facial nerve ， nasal， and are protected by German and international copyright laws. All rights reserved. Register nowand grab your free ultimate anatomy study guide! ， the gland is innervated by the glossopharyngeal nerve (CN IX).Functions of the facial nerveSpecial visceral efferent (SVE) fibers Special visceral efferent。
PA: Lippincott Williams Wilkins. Illustrators: Facial nerve (cadaveric dissection) - Prof. Carlos Suárez-Quian Facial nerve (cranial nerve VII): want to learn more about it? Our engaging videos。