• Login
    View Item 
    •   Repository Home
    • Brock Theses
    • Masters Theses
    • M.Sc. Biological Sciences
    • View Item
    •   Repository Home
    • Brock Theses
    • Masters Theses
    • M.Sc. Biological Sciences
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Relationship between photoperiod, plasma concentration of ionic calcium and the histology of the prolactin-secreting cells of the rostral pars distalis of the pituitary gland, the corpuscles of stannius and the ultimobranchial gland in the goldfish, Carassius auratus L. /

    Thumbnail
    View/Open
    Brock_Calarco_Ann-Marie_1980.pdf (11.81Mb)
    Date
    1980-06-09
    Author
    Calarco, Ann Marie.
    Metadata
    Show full item record
    Abstract
    The relationship between photoperiod, plasma concentration of ionic calcium and the histology of the prolactin-secreting cells of the rostral pars distalis of the pituitary gland, the Corpuscles of Stannius and the Ultimobranchial gland were investigated. Neither the plasma concentration of ionic calcium nor histologically apparent prolactin cell activity could be correlated with photoperiod. Some evidence of a photoperiodic effect on both the Corpuscles of Stannius and the Ultimobranchial gland was obtained. The expected reciprocal relationship between the activity of these glands was not obvious at the histological level . Quantitative and qualitative analysis at the light microscope level revealed, however, that the hormone prolactin-secreting eta cells of the rostral pars distalis and the hypocalcin-secreting cells of the Corpuscles of Stannius may be arranged in a lamellar pattern comprized of synchronous bands of cells in like-phase of a secretory cycle consisting of four stages - synthesis, storage, release and reorganization. Such synchronized cell cycles in these glands have not heretofore been described in literature. It is suggested that the maintenance of at least 255? of the cells in any one phase of the cycle ensures a supply of the required hormone at all times.
    URI
    http://hdl.handle.net/10464/1580
    Collections
    • M.Sc. Biological Sciences

    Brock University | Copyright © 2006-2015 
    Contact Us | Send Feedback
     

     

    Browse

    All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    Brock University | Copyright © 2006-2015 
    Contact Us | Send Feedback