The cerebral ganglia ofMilnesium tardigradumDoyère (Apochela, Tardigrada): Three dimensional reconstruction and notes on their ultrastructure
作者:
HOLGER WIEDERHÖFT,
HARTMUT GREVEN,
期刊:
Zoological Journal of the Linnean Society
(WILEY Available online 1996)
卷期:
Volume 116,
issue 1‐2
页码: 71-84
ISSN:0024-4082
年代: 1996
DOI:10.1111/j.1096-3642.1996.tb02334.x
出版商: Blackwell Publishing Ltd
关键词: Eutardigracla;supraoesophageal mass;neuropil pericarya;synapses
数据来源: WILEY
摘要:
Differential interference contrast micrographs from stretched animals, serially sectioned semi‐thin and ultrathin sections revealed that the cerebral ganglia (supraoesophageal mass) of the eulardigradeMilnesium tardigradumlie above the buccal tube and adjacent tissue like a saddle. It has an anterior indentation which is penetrated by two muscles that arise from the cuticle of the forehead. The cerebral ganglia consist of lateral outer lobes bearing an eye on each side, and two inner lobes which extend caudally. Between the inner lobes a cone‐like projection tapers into a nerve bundle. Each outer lobe is joined with the first ventral ganglion. From the outer lobe near the eye the ganglion for a posterolateral sensory field extends to the epidermis. Anterior to the supraoesophageal mass are three dorsal ganglia for the upper three peribuccal papillae. Two additional ganglia attached to the cerebral mass supply the lateral cephalic papillae. The cerebral ganglia are covered by a thin neural lamella. The pericarya which surround the neuropil have large nuclei. Near the axons in the centre of the supraoesophageal mass the cytoplasm is crowded with vesicles of different size and appearance. Some of them resemble synaptic vesicles while others resemble dense core bodies. Structurally different types of synapses and axons can be distinguished within the neuro
点击下载:
PDF
(3833KB)
返 回