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- W2507156770 endingPage "935" @default.
- W2507156770 startingPage "919" @default.
- W2507156770 abstract "This study explores two points related to the pattern of innervation of the extraocular muscles. First, species differences exist in the location of the motoneurons supplying multiply innervated fibers (MIFs) and singly innervated fibers (SIFs) in eye muscles. MIF motoneurons are located outside the extraocular nuclei in primates, but are intermixed with SIF motoneurons within rat extraocular nuclei. To test whether this difference is related to visual capacity and frontal placement of eyes, we injected retrograde tracers into the medial rectus muscle of the cat, a highly visual nonprimate with frontally placed eyes. Distal injections labeled smaller MIF motoneurons located ventrolaterally and rostrally within the oculomotor nucleus (III). More central injections also labeled a separate population of larger cells located dorsally in III. Thus, the cat shares with the nocturnal rat the feature of having MIF motoneurons located within the bounds of III. On the other hand, just as with monkeys, cats show segregation of the MIF and SIF medial rectus motoneuron pools, albeit in a different pattern. Second, extraocular muscles are divided into two layers; the inner, global layer inserts into the sclera, and the outer, orbital layer inserts into the connective tissue pulley. To test whether these layers are supplied by anatomically discrete motoneuron pools, we injected tracer into the orbital layer of the cat lateral rectus muscle. No evidence of either morphological or distributional differences was found, suggesting that the functional differences in these layers may be due mainly to their orbital anatomy, not their innervation. J. Comp. Neurol. 525:919–935, 2017. © 2016 Wiley Periodicals, Inc." @default.
- W2507156770 created "2016-09-16" @default.
- W2507156770 creator A5001238742 @default.
- W2507156770 creator A5069517358 @default.
- W2507156770 creator A5073830095 @default.
- W2507156770 creator A5076845406 @default.
- W2507156770 date "2016-11-07" @default.
- W2507156770 modified "2023-09-23" @default.
- W2507156770 title "Examination of feline extraocular motoneuron pools as a function of muscle fiber innervation type and muscle layer" @default.
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