Facial Nerve Quiz (ODS Learning Outcomes)

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

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?

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?

Temporal branch

Cervical branch

Zygomatic branch (correct)

Buccal branch

Where does the cervical branch of the facial nerve primarily supply muscle?

Platysma muscle Signup and view all the answers

The buccal branch of the facial nerve is responsible for innervating which of the following muscles?

Zygomaticus Signup and view all the answers

How many branches does the facial nerve terminate into after passing through the parotid gland?

5 branches Signup and view all the answers

Which of the following is NOT a cause of facial nerve damage?

Hearing loss Signup and view all the answers

Which function is primarily associated with the marginal mandibular branch of the facial nerve?

Muscles of expression in the lower lip Signup and view all the answers

What is the primary motor function of the Facial nerve (VII)?

Motor supply to muscles of facial expression Signup and view all the answers

Which of the following is NOT a function of the Facial nerve?

Sensory innervation to the abdominal cavity Signup and view all the answers

What anatomical landmark does the facial nerve exit the skull through?

Stylomastoid foramen Signup and view all the answers

Which muscles does the zygomatic branch primarily innervate?

Lower part of orbicularis oculi and muscles of upper lip Signup and view all the answers

Which branch of the Facial nerve is responsible for taste sensations?

Chorda tympani Signup and view all the answers

Where does the Facial nerve primarily arise from in the brainstem?

Pons Signup and view all the answers

Which gland receives parasympathetic innervation from the Facial nerve?

Sublingual gland Signup and view all the answers

What structure does the Facial nerve travel through before exiting the skull?

Internal acoustic meatus Signup and view all the answers

What is the role of the greater petrosal nerve?

Parasympathetic fibers to mucous glands Signup and view all the answers

What role does the stapedius muscle play in the ear?

Dampens loud noises Signup and view all the answers

Which anatomical course is associated with the Facial nerve first?

Intracranial route Signup and view all the answers

Which structure is innervated by parasympathetic fibers from the Facial nerve?

Lacrimal glands Signup and view all the answers

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.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

This quiz explores the anatomy and functions of the Facial Nerve (VII), covering its motor, sensory, and parasympathetic roles. Understand its course through the cranial structures and its branches. Test your knowledge on this crucial nerve's implications in facial expression and taste sensations.