Journal article
The trochlear motoneurons of lampreys (Lampetra fluviatilis): location, morphology and numbers as revealed with horseradish peroxidase
Cell and tissue research, Vol.252(2), pp.223-229
05/1988
DOI: 10.1007/BF00214364
PMID: 3383208
Abstract
The cells of origin of the trochlear nerve of Lampetra fluviatilis have been labelled with horseradish peroxidase (HRP) in order to compare the location and morphology of trochlear motoneurons with those of other vertebrates and to gain insight into the phylogenetic changes of the trochlear system. About 126 bipolar and tripolar trochlear motoneuron perikarya are found in a dorsal tegmental position close to the trochlear root. Only approximately 16% of the labelled cells are on the ipsilateral side of the brain, i.e. they lie predominantly contralateral as in gnathostome vertebrates. Dorsally directed dendrites reach the area of lateral-line and retinofugal fibres, and may establish functional contacts. In addition, each motoneuron has a ventral dendrite that extends towards the fasciculus longitudinalis medialis and to the ventral tegmentum. The dendrites branch close to the oculomotor root. Lampreys show a low muscle fibre to motoneuron ratio (4.5:1), i.e., they resemble amniotic vertebrates more than other anamniotic vertebrates. These data demonstrate both closer resemblance and larger differences of cyclostome and gnathostome trochlear motoneurons than previously suggested.
Details
- Title: Subtitle
- The trochlear motoneurons of lampreys (Lampetra fluviatilis): location, morphology and numbers as revealed with horseradish peroxidase
- Creators
- Bernd FritzschRonald Sonntag
- Resource Type
- Journal article
- Publication Details
- Cell and tissue research, Vol.252(2), pp.223-229
- DOI
- 10.1007/BF00214364
- PMID
- 3383208
- NLM abbreviation
- Cell Tissue Res
- ISSN
- 0302-766X
- eISSN
- 1432-0878
- Language
- English
- Date published
- 05/1988
- Academic Unit
- Iowa Neuroscience Institute; Biology; Craniofacial Anomalies Research Center
- Record Identifier
- 9984070757702771
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