The Ultrastructure of Interacting Endocrine and Target Cells

  • Bonnie Joy Sedlak


A study of cell structure alone is inherently interesting, but it is far less informative than a study which attempts to elucidate the functions reflected in cellular morphology. In developmental biology, the focus is on cellular changes occurring with time. How does the ultrastructure of a cell change as it matures and what is the functional significance of these changes? Since the development of insects is controlled by hormonal cues, a study of the developing endocrine glands and their target tissues interpreted in the context of their own endocrine environment presents a unique opportunity to determine a structural basis for endocrine activity and to define interactions between these tissues. One of the best studied insects from this point of view is Manduca sexta. In this tobacco hornworm, the titers of various hormones have been carefully determined and the ultrastructures of certain endocrine glands and target tissues have been recorded. This review will concentrate on the work carried out with this insect, but will refer to work with other insects where appropriate.


Larval Instar Juvenile Hormone Tobacco Hornworm Corpus Allata Juvenile Hormone Titer 
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© Plenum Press, New York 1984

Authors and Affiliations

  • Bonnie Joy Sedlak
    • 1
  1. 1.Developmental Biology CenterUniversity of CaliforniaIrvineUSA

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