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Anat Embryol (Berl)
1987 Jan 01;1772:105-14. doi: 10.1007/bf00572534.
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The trochlear nerve of amphibians and its relation to proprioceptive fibers: a qualitative and quantitative HRP study.
Fritzsch B
,
Sonntag R
.
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The cells of origin of the trochlear nerve of urodeles, anurans and gymnophionans were labelled with HRP in order to compare the location and morphology of trochlear motoneurons and to find evidence for sensory fibers in the trochlear nerve of amphibians. Trochlear motoneuron perikarya were found in a ventral tegmental position predominantly on the contralateral side, but an ipsilateral cell was present in some specimens of urodeles and anurans. About 19 motoneurons were labelled in Ambystoma, about 60 motoneurons in Xenopus, and a maximum of 7 cells in Ichthyophis. Decussation of trochlear nerve fibers showed only in Xenopus a highly variable pattern. In urodeles, selective filling of the trochlear nerve labelled in addition to trochlear motoneurons a caudo-medical tectal group of about 20 neurons of the nucleus of the mesencephalic root of the trigeminal nerve. Gymnophionans showed also labelled cells of the mesencephalic trigeminal root in the caudal midbrain close to the trochlear nerve root. In some frogs, a few cells of the mesencephalic trigeminal root were labelled in the caudal tectum and occasionally in the velum medullare anterius. Comparison of the numbers of trochlear nerve fibers with HRP-labelled motoneurons revealed in Xenopus a proportion of 1.2:1, but of 2.7:1 in Ambystoma. However, counting both labelled motoneurons and cells of the mesencephalic trigeminal root resulted in a trochlear nerve fiber to labelled neuron proportion of 1.3:1 in Ambystoma much like in Xenopus. The numbers of superior oblique muscle fibers and of trochlear nerve fibers, but not of HRP-labelled motoneurons, increased significantly with size in Xenopus laevis. We suggest that increased peripheral branching of individual fibers within the trochlear nerve with size rather than differentiation of additional motoneurons takes place in growing postmetamorphic Xenopus. In contrast to other vertebrates studied so far, the trochlear nerve is a mixed nerve in Ambystoma and perhaps in Ichthyophis. Whether this reflects a primitive or a derived condition is at present unclear.
Daunicht,
Afferent innervation of extraocular muscles in the rat studied by retrograde and anterograde horseradish peroxidase transport.
1985, Pubmed
Daunicht,
Afferent innervation of extraocular muscles in the rat studied by retrograde and anterograde horseradish peroxidase transport.
1985,
Pubmed
Easter,
The growth and development of the superior oblique muscle and trochlear nerve in juvenile and adult goldfish.
1979,
Pubmed
Ebbesson,
A method for estimating the number of cells in histological sections.
1965,
Pubmed
Escher,
Detergent-soaked HRP-chips: a new method for precise and effective delivery of small quantities of the tracer to nervous tissue.
1983,
Pubmed
,
Xenbase
Finger,
Retrograde HRP labeling of the oculomotoneurons in adult lampreys.
1978,
Pubmed
Fritzsch,
Visual projections in larval Ichthyophis kohtaoensis (Amphibia: gymnophiona).
1985,
Pubmed
Fritzsch,
Projection patterns of lateral-line afferents in anurans: a comparative HRP study.
1984,
Pubmed
,
Xenbase
Gacek,
Localization of neurons supplying the extraocular muscles in the kitten using horseradish peroxidase.
1974,
Pubmed
Gomez Segade,
Location and quantitative analysis of the motoneurons innervating the extraocular muscles of the guinea-pig, using horseradish peroxidase (HRP) and double or triple labelling with fluorescent substances.
1983,
Pubmed
Graf,
Elasmobranch oculomotor organization: anatomical and theoretical aspects of the phylogenetic development of vestibulo-oculomotor connectivity.
1984,
Pubmed
Hiscock,
Peripheral and central terminations of axons of the mesencephalic trigeminal neurons in Xenopus.
1982,
Pubmed
,
Xenbase
Hiscock,
The formation of axonal projections of the mesencephalic trigeminal neurones in chick embryos.
1986,
Pubmed
Kollros,
Growth and death of cells of the mesencephalic fifth nucleus in Rana pipiens larvae.
1984,
Pubmed
Labandeira Garcia,
Localisation of motoneurons supplying the extra-ocular muscles of the rat using horseradish peroxidase and fluorescent double labelling.
1983,
Pubmed
Lang,
[Medical findings on the trochlear nerve].
1986,
Pubmed
Lowe,
The relation between soma position and fibre trajectory of neurons in the mesencephalic trigeminal nucleus of Xenopus laevis.
1984,
Pubmed
,
Xenbase
Luiten,
Proprioceptive reflex connections of head musculature and the mesencephalic trigeminal nucleus in the carp.
1979,
Pubmed
Luiten,
Extraocular muscle representation in the brainstem of the carp.
1978,
Pubmed
Maier,
The occurrence of muscle spindles in extraocular muscles of various vertebrates.
1974,
Pubmed
Matesz,
The dorsomedial nuclear group of cranial nerves in the frog.
1977,
Pubmed
Miyazaki,
Bilateral innervation of the superior oblique muscle by the trochlear nucleus.
1985,
Pubmed
Narayanan,
Determination of the embryonic origin of the mesencephalic nucleus of the trigeminal nerve in birds.
1978,
Pubmed
Naujoks-Manteuffel,
Localization of motoneurons innervating the extraocular muscles in Salamandra salamandra L. (Amphibia, Urodela).
1986,
Pubmed
Nieuwenhuys,
The brain of the lamprey in a comparative perspective.
1977,
Pubmed
Nikundiwe,
The cell masses in the brainstem of the South African clawed frog Xenopus laevis: a topographical and topological analysis.
1983,
Pubmed
,
Xenbase
Opdam,
Topological analysis of the brain stem of the axolotl Ambystoma mexicanum.
1976,
Pubmed
Oppenheim,
The absence of significant postnatal motoneuron death in the brachial and lumbar spinal cord of the rat.
1986,
Pubmed
Rosiles,
The organization of the extraocular motor nuclei in the Atlantic stingray, Dasyatis sabina.
1980,
Pubmed
Ruskell,
Spiral nerve endings in human extraocular muscles terminate in motor end plates.
1984,
Pubmed
Scherer,
Reinnervation of the extraocular muscles in goldfish is nonselective.
1986,
Pubmed
Scherer,
Degenerative and regenerative changes in the trochlear nerve of goldfish.
1984,
Pubmed
Sohal,
Development of the trochlear nerve: loss of axons during normal ontogen.
1978,
Pubmed
Sohal,
Development of the trochlear nucleus in quail and comparative study of the trochlear nucleus, nerve, and innervation of the superior oblique muscle in quail, chick, and duck.
1985,
Pubmed
Sohal,
Identification of the trochlear motoneurons by retrograde transport of horseradish peroxidase.
1978,
Pubmed
Sonntag,
The development of the amphibian trochlear nucleus. An HRP study.
1987,
Pubmed
,
Xenbase
Sperry,
Postmetamorphic changes in the lumbar lateral motor column in relation to muscle growth in the toad, Bufo americanus.
1983,
Pubmed
Walberg,
On the morphology of the mesencephalic trigeminal cells. New data based on tracer studies.
1984,
Pubmed
ZAKI,
[The trochlear nerve in man. Study relative to its origin, its intracerebral traject and its structure].
1960,
Pubmed
