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The structural maturation of the stato‐acoustic nerve in the cat
Author(s) -
Romand Raymond,
Sans Alain,
Romand Marie Rose,
Marty Robert
Publication year - 1976
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.901700102
Subject(s) - vestibular nerve , cochlear nerve , anatomy , biology , myelin sheath , vestibular system , gestation , myelin , cochlea , pregnancy , central nervous system , neuroscience , genetics
Abstract The maturation of the stato‐acoustic nerve in the cat was studied by light and electron microscopy from the fetal stage to the adult. Measurement of the outer diameter of the fibers and the study of the myelination process revealed that myelination begins earlier for the vestibular nerve than for the cochlear nerve: by the fifty‐third day of gestation 64% of the vestibular fibers have already passed the promyelin stage whereas for the cochlear nerve this promyelin stage begins for the majority of fibers on the fifty‐seventh gestation day. Afterward, maturation proceeds more rapidly for the cochlear nerve. In the case of both nerves, maturation is still incomplete at two months of age. Concerning the relationship between the thickness of the myelin sheath and the axoplasmic diameter, there is already a good correlation by the fifty‐seventh day of gestation in the vestibular nerve, whereas it appears several days after birth in the cochlear nerve.