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hypoglossal nerve |
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hypoglossal nerve [¦hī·pə¦gläs·əl ′nərv] (neuroscience) The twelfth cranial nerve; a paired motor nerve in tetrapod vertebrates innervating tongue muscles; corresponds to the hypobranchial nerve in fishes. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The fistulous tract ascends along the carotid sheath, then posterior to the common carotid artery, then superior to the superior laryngeal, hypoglossal, and vagus nerves; it finally opens into the piriform sinus. For example, nanosized ferritin and iron-dextran, after injection into the tongue of mice, labeled the neurons of the hypoglossal nuclei, and injection of both of these NSPs into facial muscles of mice also resulted in synaptic uptake; cationized ferritin was also detected in cell bodies of facial neurons, indicating that electrical charge is of importance for incorporation into axons and axonal transport (Arvidson 1994; Malmgren et al. The hypoglossal canals, a pair of bony tubes located on the left and right sides of the skull's base, were nominated just last year as skeletal signposts of speech. |
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