--- title: "Anatomy of Facial Nerve – Branches" description: "Detailed ENT notes on the Branches of the Facial Nerve - ideal for MBBS and ENT students." source: "The ENT Resident" canonical_url: "https://www.theentresident.com/ent-notes-lectures/facial-nerve-branches" categories: ["Otology"] video: "https://www.youtube.com/watch?v=wL3gdqziF2M" image: "https://media.theentresident.com/og-images/facial-nerve-branches.png" --- # Anatomy of Facial Nerve – Branches Detailed ENT notes on the Branches of the Facial Nerve - ideal for MBBS and ENT students. Watch the full video lecture on YouTube: https://www.youtube.com/watch?v=wL3gdqziF2M ## Anatomy of the Facial Nerve - Branches The **facial nerve (cranial nerve VII)** is a mixed nerve that carries motor, sensory, and parasympathetic fibers. Its branches can be categorized based on their origin along the nerve's course: ### 1. Branch from the Geniculate Ganglion **a. Greater Superficial Petrosal Nerve (GSPN)** - **Origin**: Arises from the geniculate ganglion. - **Function**: Carries preganglionic parasympathetic fibers to the pterygopalatine ganglion. - **Course**: - Passes through the facial hiatus → middle cranial fossa - Joins the deep petrosal nerve at the foramen lacerum - Forms the nerve of the pterygoid canal (vidian nerve) → pterygopalatine ganglion --- ### 2. Branches within the Facial Canal **a. Nerve to Stapedius** - **Origin**: Arises from the facial nerve within the facial canal. - **Function**: Innervates the stapedius muscle, which stabilizes the stapes bone in the middle ear. **b. Chorda Tympani** - **Origin**: Branches ~5 mm proximal to the stylomastoid foramen. - **Function**: - Taste sensation from anterior 2/3rd of the tongue - Parasympathetic fibers to submandibular and sublingual glands - **Course**: - Enters tympanic cavity → crosses tympanic membrane - Exits via petrotympanic fissure → joins lingual nerve in infratemporal fossa --- ### 3. Branches after Exiting the Stylomastoid Foramen **a. Posterior Auricular Nerve** - **Origin**: Arises immediately after exiting the stylomastoid foramen. - **Function**: - Motor supply to: - Occipital belly of occipitofrontalis - Auricular muscles - Communicates with the auricular branch of the vagus nerve **b. Muscular Branches** - **Innervate**: - Posterior belly of digastric muscle - Stylohyoid muscle --- ### 4. Terminal Branches within the Parotid Gland After entering the parotid gland, the facial nerve divides into: - **Temporofacial Division** - **Cervicofacial Division** These give rise to **five terminal branches**: 1. **Temporal Branch** - Frontalis - Orbicularis oculi - Corrugator supercilii 2. **Zygomatic Branch** - Orbicularis oculi - Zygomaticus major and minor 3. **Buccal Branch** - Buccinator - Orbicularis oris 4. **Marginal Mandibular Branch** - Depressor anguli oris - Mentalis 5. **Cervical Branch** - Platysma --- ### 5. Communicating Branches **a. Auricular Branch of the Vagus Nerve (Arnold's Nerve)** - **Communication**: Posterior auricular nerve ↔ Auricular branch of vagus nerve - **Function**: Sensory innervation to: - External ear (concha) - External acoustic meatus --- ## About This Note This note on Anatomy of Facial Nerve – Branches is one of the free ENT study notes published by The ENT Resident. 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