What are GVA fibers?
Anatomical terminology. The general visceral afferent (GVA) fibers conduct sensory impulses (usually pain or reflex sensations) from the internal organs, glands, and blood vessels to the central nervous system.
What is GSE and GVE?
GSE fibers carry motor signals to skeletal muscles derived from embryonic somites. GVA fibers carry general sensation from the viscera. GVE fibers provide motor (parasympathetic) innervation to the viscera. SSA fibers carry special sensation from the eye and ear.
What Fibres are carried in the facial nerve?
The facial nerve is the seventh cranial nerve. It contains the motor, sensory, and parasympathetic (secretomotor) nerve fibers, which provide innervation to many areas of the head and neck region.
Does facial nerve have GVA?
After synapsing on the geniculate ganglion, the facial nerve gives rise to the first branch; the greater petrosal nerve, which carries visceromotor parasympathetic fibers (GVE) to the lacrimal gland and GVA from the nasal cavity, paranasal sinuses and part of the soft palate.
What Innervates GVA?
Glossopharyngeal GVA fibers innervate the mucosal membranes that line the internal surface of the middle ear and cover the posterior third of the tongue, the tonsils, the posterior and upper surfaces of the pharynx, and the Eustachian tube.
What GSE means?
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What are GSE Fibres?
The general (spinal) somatic efferent neurons (GSE, somatomotor, or somatic motor fibers), arise from motor neuron cell bodies in the ventral horns of the gray matter within the spinal cord. They exit the spinal cord through the ventral roots, carrying motor impulses to skeletal muscle through a neuromuscular junction.
What is the function of visceral nerves?
A peripheral nerve that contains axons of the autonomic nervous system, either transmitting afferent signals from mucous membranes, glands, and vessels (visceral sensory nerves) or transmitting efferent signals to smooth muscles and glands (visceral motor nerves).
What are the functional components of the facial nerve?
Functional components. The facial nerve also carries axons of type GVE, general visceral efferent, which innervate the sublingual, submandibular, and lacrimal glands, also mucosa of nasal cavity. Axons of type SVE, special visceral efferent, innervate muscles of facial expression, stapedius, the posterior belly of digastric, and the stylohyoid.
Where does the facial nerve join the vagus nerve?
The facial nerve is joined by the auricular branch of the vagus nerve. This leaves the vagus nerve at the level of the jugular foramen and constitute the lateral internal auricular nerve (a branch of the facial nerve) that innervates the external ear canal.
How do the dorsal and ventral buccal branches receive GSA fibers?
The dorsal and ventral buccal branches receive GSA fibers through communicating branches of the auriculotemporal nerve and mylohyoid nerves respectively (these nerves are branches of the mandibular nerve). The auriculopalpebral nerve divides into palpebral and rostral auricular branches.
Where does the major petrosal nerve leave the facial nerve?
The major petrosal nerve (GVE and GVA) leaves the facial nerve at the level of the geniculate ganglion. It is joined by sympathetic postganglionic fibers from the cranial cervical ganglion via the internal carotid plexus. These sympathetic fibers form the deep petrosal nerve.