LOCALIZATION OF MOTOR NEURONS IN THE OCULOMOTOR NUCLEUS INNERVATING THE INFERIOR OBLIQUE MUSCLE AND THEIR DENDRITIC ARCHITECTURE IN THE RABBIT——A STUDY USING CT-HRP
- VernacularTitle:家兔下斜肌运动神经元在动眼神经核内的分布及其树突构筑学——CT-HRP法研究
- Author:
Siyun SHU
;
Gong JU
- Publication Type:Journal Article
- Keywords:
Inferior oblique muscle;
Oculomotor nucleus;
Dendritic architecture;
CT-HRP method;
Rabbit
- From:
Acta Anatomica Sinica
1955;0(03):-
- CountryChina
- Language:Chinese
-
Abstract:
The localization of the neurons which control the inferior oblique muscle in the oculomotor nucleus and their dendritic architecture were studied by injecting the conjugated cholera toxin-horseradish peroxidase (CT-HRP) into the inferior oblique muscle of 7 rabbits.The oculomotor nucleus could be divided into oral, middle and caudal parts. The middle part was further divided into dorsomedial and ventrolateral parts, and the caudal part divided into dorsal and ventral parts. The labeled neurons innervating the inferior oblique muscle were mainly distributed ipsilaterally and occupying two thirds. of the rostrocaudal extent of the oculomotor nucleus, a few were scattered contralaterally.The labeled cells were found in the dorsomedial part of the nucleus orally, and shifted in successive caudal sections to the medial and then to the ventral part. No labeled cells in the oral and caudal ends of the nucleus could be identified.The dendritic branches of the labeled neurons covered the whole nucleus, but densest in its dorsomedial part. Many of them extended beyond the boundary of the nucleus into the central gray matter dorsally, some even approacheding the aqueduct, or through the medial longitudinal fasciculus into the reticular formation laterally and ventrally. A few dendrites crossed the midline into the contralateral nucleus. Therefore the receptive field of the oculomotor nucleus is presumably much larger than the area of the nucleus itself.
