Special visceral afferent fiber

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Special visceral afferent fibers (SVA) are afferent fibers that develop in association with the gastrointestinal tract.^[1] They carry the special sense of taste (gustation). The cranial nerves containing SVA fibers are the facial nerve (VII), the glossopharyngeal nerve (IX), and the vagus nerve (X).^[2] The facial nerve receives taste from the anterior 2/3 of the tongue; the glossopharyngeal from the posterior 1/3, and the vagus nerve from the epiglottis.^[3] The sensory processes, using their primary cell bodies from the inferior ganglion, send projections to the medulla, from which they travel in the tractus solitarius, later terminating at the rostral nucleus solitarius.^[4]

References

^ cranialnerves at The Anatomy Lesson by Wesley Norman (Georgetown University)
^ Standring, Susan, ed. (2016). "Overview of the nervous system". Gray's Anatomy: The Anatomical Basis of Clinical Practice (41 ed.). Elsevier. p. 232. ISBN 978-0-7020-5230-9.
^ Drake et al. (2010), Gray's Anatomy for Students, 2nd Ed., Churchill Livingstone.
^ Bhatnagar C. Subhash. Neuroscience for the study of communicative disorders. Philadelphia, Pennsylvania. Lippincott Williams & Wilkins, 2002

External links

Overview at mmi.mcgill.ca

Nervous tissue

CNS

Tissue Types

Cell Types

Neuronal	Pyramidal Purkinje Granule Von Economo Medium spiny Interneuron
Glial	Astrocyte Ependymal cells Tanycyte Oligodendrocyte progenitor cell Oligodendrocyte Microglia

PNS

General	Dorsal Root Ganglion Ramus Ventral Root Ramus Ramus communicans Gray White Autonomic ganglion (Preganglionic nerve fibers Postganglionic nerve fibers) Nerve fascicle Funiculus
Connective tissues	Epineurium Perineurium Endoneurium
Neuroglia	Myelination: Schwann cell Neurilemma Myelin incisure Node of Ranvier Internodal segment Satellite glial cell

Neurons/
nerve fibers

Parts

Soma	Axon hillock
Axon	Telodendron Axon terminals Axoplasm Axolemma Neurofibril/neurofilament
Dendrite	Nissl body Dendritic spine Apical dendrite/Basal dendrite

Types

Afferent nerve fiber/
Sensory neuron

Efferent nerve fiber/
Motor neuron

Termination

Synapse	Electrical synapse/Gap junction Chemical synapse Synaptic vesicle Active zone Postsynaptic density Autapse Ribbon synapse Neuromuscular junction
Sensory receptors	Meissner's corpuscle Merkel nerve ending Pacinian corpuscle Ruffini ending Muscle spindle Free nerve ending Nociceptor Olfactory receptor neuron Photoreceptor cell Hair cell Taste receptor

Anatomy of taste

Tongue

Path

medulla	Solitary tract VII IX X Solitary nucleus Gustatory nucleus
pons	Central tegmental tract Medial parabrachial nucleus Hypothalamus Amygdala
thalamus	Ventral posteromedial nucleus
cerebrum	Posterior limb of internal capsule Gustatory cortex

Other

Basic tastes
Special visceral afferent

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References

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