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Separate populations of neurons in the oculomotor nucleus project to the cerebellum and the abducent nucleus. A retrograde fluorescent double-labelling study in the cat. 1990

G K Røste
Anatomical Institute, University of Oslo, Norway.

Retrograde transport of fluorescent substances was used in order to investigate possible branching of axons from neurons in the oculomotor nucleus in the cat. Rhodamine-B-isothiocyanate (RITC) was injected into the cerebellar hemisphere, while Fluoro-Gold was implanted into the abducent nucleus. Neurons single-labelled with either of the dyes were found in the oculomotor nucleus in all cases, but no double-labelled neurons were found. The labelled cells were smaller than motoneurons and located in partly overlapping areas along the dorsal border of the oculomotor nucleus, with the RITC labelled cerebellar projecting cells concentrated medially and the Fluoro-Gold labelled neurons projecting to the abducent nucleus concentrated laterally. The RITC labelled cells were found throughout the rostrocaudal extent of the nucleus, while the Fluoro-Gold labelled cells were mainly found caudally. The present findings demonstrate that oculomotor neurons projecting to the feline cerebellum and abducent nucleus represent separate cell populations.

UI MeSH Term Description Entries
D009802 Oculomotor Nerve The 3d cranial nerve. The oculomotor nerve sends motor fibers to the levator muscles of the eyelid and to the superior rectus, inferior rectus, and inferior oblique muscles of the eye. It also sends parasympathetic efferents (via the ciliary ganglion) to the muscles controlling pupillary constriction and accommodation. The motor fibers originate in the oculomotor nuclei of the midbrain. Cranial Nerve III,Third Cranial Nerve,Nerve III,Nervus Oculomotorius,Cranial Nerve IIIs,Cranial Nerve, Third,Cranial Nerves, Third,Nerve IIIs,Nerve, Oculomotor,Nerve, Third Cranial,Nerves, Oculomotor,Nerves, Third Cranial,Oculomotor Nerves,Oculomotorius, Nervus,Third Cranial Nerves
D002415 Cats The domestic cat, Felis catus, of the carnivore family FELIDAE, comprising over 30 different breeds. The domestic cat is descended primarily from the wild cat of Africa and extreme southwestern Asia. Though probably present in towns in Palestine as long ago as 7000 years, actual domestication occurred in Egypt about 4000 years ago. (From Walker's Mammals of the World, 6th ed, p801) Felis catus,Felis domesticus,Domestic Cats,Felis domestica,Felis sylvestris catus,Cat,Cat, Domestic,Cats, Domestic,Domestic Cat
D002531 Cerebellum The part of brain that lies behind the BRAIN STEM in the posterior base of skull (CRANIAL FOSSA, POSTERIOR). It is also known as the "little brain" with convolutions similar to those of CEREBRAL CORTEX, inner white matter, and deep cerebellar nuclei. Its function is to coordinate voluntary movements, maintain balance, and learn motor skills. Cerebella,Corpus Cerebelli,Parencephalon,Cerebellums,Parencephalons
D005456 Fluorescent Dyes Chemicals that emit light after excitation by light. The wave length of the emitted light is usually longer than that of the incident light. Fluorochromes are substances that cause fluorescence in other substances, i.e., dyes used to mark or label other compounds with fluorescent tags. Flourescent Agent,Fluorescent Dye,Fluorescent Probe,Fluorescent Probes,Fluorochrome,Fluorochromes,Fluorogenic Substrates,Fluorescence Agents,Fluorescent Agents,Fluorogenic Substrate,Agents, Fluorescence,Agents, Fluorescent,Dyes, Fluorescent,Probes, Fluorescent,Substrates, Fluorogenic
D000010 Abducens Nerve The 6th cranial nerve which originates in the ABDUCENS NUCLEUS of the PONS and sends motor fibers to the lateral rectus muscles of the EYE. Damage to the nerve or its nucleus disrupts horizontal eye movement control. Cranial Nerve VI,Sixth Cranial Nerve,Abducent Nerve,Nerve VI,Nervus Abducens,Abducen, Nervus,Abducens, Nervus,Abducent Nerves,Cranial Nerve VIs,Cranial Nerve, Sixth,Nerve VI, Cranial,Nerve VIs,Nerve VIs, Cranial,Nerve, Abducens,Nerve, Abducent,Nerve, Sixth Cranial,Nerves, Sixth Cranial,Nervus Abducen,Sixth Cranial Nerves
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013266 Stilbamidines STILBENES with AMIDINES attached.

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