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Nervus tenuis , a Hitherto Unknown Cranial Nerve of the Fourth Metamere
Author(s) -
Bjerring Hans C.
Publication year - 1970
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1111/j.1463-6395.1970.tb00422.x
Subject(s) - anatomy , biology , trunk , accessory nerve , glossopharyngeal nerve , vagus nerve , neuroscience , stimulation , ecology
In hynobiid urodele embryos there are three serially arranged muscles associated with the otic and occipital regions of the endocranium. These muscles are continuous posteriorly with the succession of trunk myomeres and most likely represent myotomic derivatives attributable to the third, fourth, and fifth metameres of the body. From front to back these muscles are designated: anterior basiotic, posterior basiotic, and occipital. A hitherto unknown cranial nerve is directed towards the posterior basiotic muscle in embryos of Hynobius retardatus . For this new somatic motor nerve the term nervus tenuis is proposed. Together with the glossopharyngeal nerve it constitutes the fourth cranionerval segment.