Abstract:
:An electron microscopical examination has been made of the fine structure and disposition of pancreatic polypeptide immunoreactive cells associated with the egg-forming apparatus in Diclidophora merlangi. The cell bodies are positioned in the parenchyma surrounding the ootype and taper to axon-like processes that extend to the ootype wall. The terminal regions of these processes branch and anastomose and, in places, the swollen endings or varicosities form synaptic appositions with the muscle fibres in the ootype wall. The cells are characterized by an extensive GER-Golgi system that is involved in the assembly and packaging of dense-cored vesicles. The vesicles accumulate in the axons and terminal varicosities, and their contents were found to be immunoreactive with antisera raised to the C-terminal hexapeptide amide of pancreatic polypeptide. It is concluded that the cells are neurosecretory in appearance and that, functionally, their secretions may serve to regulate ootype motility and thereby help co-ordinate egg production in the worm.
journal_name
Parasitologyjournal_title
Parasitologyauthors
Halton DW,Brennan GP,Maule AG,Shaw C,Johnston CF,Fairweather Idoi
10.1017/s0031182000064404subject
Has Abstractpub_date
1991-06-01 00:00:00pages
429-36eissn
0031-1820issn
1469-8161journal_volume
102 Pt 3pub_type
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