Podcast
Questions and Answers
What is the primary function of the temporal branch of the facial nerve?
What is the primary function of the temporal branch of the facial nerve?
- Supplies the stylopharyngeus muscle
- Innervates the auricular muscles and frontalis (correct)
- Provides sensation to the upper jaw
- Controls movements of the cervical muscles
What does damage to the facial nerve potentially lead to?
What does damage to the facial nerve potentially lead to?
- Improved muscle control of the face
- Loss of taste and xerostomia (correct)
- Increased saliva production
- Enhanced hearing ability
Which branch of the facial nerve passes above the orbit?
Which branch of the facial nerve passes above the orbit?
- Temporal branch
- Cervical branch
- Zygomatic branch (correct)
- Buccal branch
Where does the cervical branch of the facial nerve primarily supply muscle?
Where does the cervical branch of the facial nerve primarily supply muscle?
The buccal branch of the facial nerve is responsible for innervating which of the following muscles?
The buccal branch of the facial nerve is responsible for innervating which of the following muscles?
How many branches does the facial nerve terminate into after passing through the parotid gland?
How many branches does the facial nerve terminate into after passing through the parotid gland?
Which of the following is NOT a cause of facial nerve damage?
Which of the following is NOT a cause of facial nerve damage?
Which function is primarily associated with the marginal mandibular branch of the facial nerve?
Which function is primarily associated with the marginal mandibular branch of the facial nerve?
What is the primary motor function of the Facial nerve (VII)?
What is the primary motor function of the Facial nerve (VII)?
Which of the following is NOT a function of the Facial nerve?
Which of the following is NOT a function of the Facial nerve?
What anatomical landmark does the facial nerve exit the skull through?
What anatomical landmark does the facial nerve exit the skull through?
Which muscles does the zygomatic branch primarily innervate?
Which muscles does the zygomatic branch primarily innervate?
Which branch of the Facial nerve is responsible for taste sensations?
Which branch of the Facial nerve is responsible for taste sensations?
Where does the Facial nerve primarily arise from in the brainstem?
Where does the Facial nerve primarily arise from in the brainstem?
Which gland receives parasympathetic innervation from the Facial nerve?
Which gland receives parasympathetic innervation from the Facial nerve?
What structure does the Facial nerve travel through before exiting the skull?
What structure does the Facial nerve travel through before exiting the skull?
What is the role of the greater petrosal nerve?
What is the role of the greater petrosal nerve?
What role does the stapedius muscle play in the ear?
What role does the stapedius muscle play in the ear?
Which anatomical course is associated with the Facial nerve first?
Which anatomical course is associated with the Facial nerve first?
Which structure is innervated by parasympathetic fibers from the Facial nerve?
Which structure is innervated by parasympathetic fibers from the Facial nerve?
Flashcards
Facial Nerve (VII) Function
Facial Nerve (VII) Function
The Facial Nerve (VII) is responsible for controlling the muscles of facial expression, providing taste sensation to the anterior two-thirds of the tongue, and supplying parasympathetic innervation to various glands.
Facial Nerve (VII) Motor Function
Facial Nerve (VII) Motor Function
The Facial Nerve (VII) controls the muscles responsible for creating facial expressions, like smiling, frowning, and raising your eyebrows.
Facial nerve exit point
Facial nerve exit point
The facial nerve exits the skull through the stylomastoid foramen, marking the transition from intracranial to its extracranial course.
Facial nerve branches
Facial nerve branches
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Temporal branch
Temporal branch
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Zygomatic branch
Zygomatic branch
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Buccal branch
Buccal branch
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Mandibular branch
Mandibular branch
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Cervical branch
Cervical branch
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Facial nerve damage
Facial nerve damage
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Facial nerve paralysis
Facial nerve paralysis
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Causes of facial nerve damage
Causes of facial nerve damage
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Study Notes
Facial Nerve (VII) Function
- Motor function: Controls muscles of facial expression (e.g., platysma, stylohyoid, posterior belly of digastric, stapedius).
- Sensory function: Taste for the anterior two-thirds of the tongue.
- Minor sensory role: For sensation in the external ear.
- Parasympathetic functions: Innervates submandibular and sublingual salivary glands, nasal, palatine, and pharyngeal mucous glands, and lacrimal glands.
Anatomical Course
- Intracranial:
- Originates in the pons (brainstem).
- Two roots: a larger motor root and a smaller sensory root.
- Enters the facial canal via the internal acoustic meatus.
- Branches into three before exiting the canal:
- Greater petrosal nerve: Parasympathetic fibers to nasal, paranasal sinus, palatine mucous glands and lacrimal gland.
- Nerve to stapedius: Motor fibers to stapedius muscle (middle ear).
- Chorda tympani: Special sensory (taste) fibers to anterior 2/3 of the tongue, and parasympathetic fibers to submandibular and sublingual glands. This nerve travels with the lingual nerve (branch of trigeminal).
- Extracranial:
- Exits the cranium via the stylomastoid foramen.
- Branches into posterior auricular nerve, posterior belly of digastric muscle, stylohyoid muscle.
- Travels through the parotid gland.
- Divides into five terminal branches: temporal, zygomatic, buccal, marginal mandibular, and cervical.
Branches and Their Function
- Temporal branch: Supplies auricular muscles, frontalis, orbicularis oculi, and corrugator supercilii muscles. It emerges superiorly in the parotid gland and travels across the zygomatic arch.
- Zygomatic branch: (Usually two branches; upper and lower), supplies frontal belly of occipitofrontalis, orbicularis oculi, and muscles of upper lip and nose.
- Buccal branch: Supplies orbicularis oris, buccinator, and zygomaticus muscles, and contributes to the innervation of upper lip and nose muscles. (Typically two branches).
- Mandibular branch: Supplies depressor labii inferioris, depressor anguli oris, and mentalis muscles (lower lip muscles).
- Cervical branch: Supplies platysma muscle (neck muscle).
Facial Nerve and Dentistry
- Damage consequences: Loss of taste, xerostomia (dry mouth), difficulty talking, and paralysis or weakness of facial muscles.
- Causes of damage: Parotid gland pathology (tumors, parotitis, surgical procedures), infection (especially herpes viruses), and (rarely) local anesthetics can harm the facial nerve.
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