5 Questions
Where do the GSA fibers of the facial nerve provide sensory input from?
The GSA fibers provide sensory input from the external acoustic meatus.
What are the functions of the GVE fibers of the facial nerve?
The GVE fibers are parasympathetic and are secretomotor to the lacrimal gland, submandibular and sublingual salivary glands, and nasal and palatine glands.
What is the function of the SVE fibers of the facial nerve?
The SVE fibers innervate muscles of the face and scalp, as well as the stapedius, the posterior belly of the digastric, and the stylohyoid muscles.
Where does the main motor nucleus of the facial nerve lie?
The main motor nucleus lies in the lower pons.
What does the intermediate nerve of the facial nerve contain?
The intermediate nerve contains the fibers for taste, the parasympathetic fibers, and somatic sensory fibers.
Study Notes
Facial Nerve Functions
- GSA (General Somatic Afferent) fibers of the facial nerve provide sensory input from the receptors in the skin of the lateral aspect of the head, including the face and ear.
- GVE (General Visceral Efferent) fibers of the facial nerve are responsible for controlling the muscles of facial expression, including the muscles of the scalp, face, and neck.
- SVE (Special Visceral Efferent) fibers of the facial nerve innervate the muscles of the palate, pharynx, and larynx, and are involved in the control of swallowing and speaking.
- The main motor nucleus of the facial nerve lies in the pontine tegmentum of the brainstem.
- The intermediate nerve of the facial nerve contains the parasympathetic and sensory fibers of the facial nerve.
Test your knowledge of the functions of the facial nerve, including its sensory and motor roles in the head and neck.
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