Histological and some histochemical studies on the pineal organ in sockeye salmon oncorhynchus nerka (Walbaum).
department or school: Science, Faculty of
department or school: Zoology, Department of
data provider: DSpace
degree campus: UBCV
creator: Hafeez, Mohammad Abdul
issued: 2011-09-26T23:39:00Z
issued: 1964
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: The pineal organ in sockeye salmon and its relation with other epithalamic components has been studied. Histological and histochemlcal methods were used and the influence of experimental photoperiods on the histology and secretion in the juvenile pineals investigated. Photosensory and supporting ependymal cells have been identified. Lipofuchsin and melanin are absent in the pineal epithelium. Besides sensory fibres, efferent end-loops are present on the sensory and supporting cells. The dorsal pineal nerve tract is probably of a mixed type. Although the blood supply is profuse an endocrine or neuroendocrine activity is not indicated. It is proposed that the pineal organ in both juveniles and adults is photosensory and secretory. The apocrine secretory activity of the sensory and some supporting cells is probably associated with either the maintenance of constant chemical composition of the cerebrospinal fluid or supply of certain substances to the nervous tissue. The subcommissural organ is metabolically more active than the pineal. The secretion consists of glycogen, mucopolysaccharides, mucoproteins, glycoproteins and aldehyde-fuchsin positive granules. Chrome-alum positive granules are abundant in the subcommissural organ. Both the pineal organ and the subcommissural organ appear independent of light's influence on secretion and histology. It seems more plausible that apocrine secretory activity is controlled by some internal factors. It is suggested that the pineal organ might be of some advantage in the light dependent behaviour of this species in terms of intensity detection. Future work is necessary in this direction.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/37629
note: HISTOLOGICAL AND SOME HISTOCHEMICAL STUDIES ON THE PINEAL ORGAN IN SOCK EYE SALMON ONCORHYNCHDS NERKA (WALBAUM) by ' MOHAMMAD ABDUL HAFEEZ B«Sc Aligarh Muslim University, 1 9 5 5 M.Sc Aligarh Muslim University, 1 9 5 7 A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS! OF THE DEGREE OF MASTER OF SCIENCE in the Department of Zoology We accept this thesis as Conforming to the required standard The University of British Columbia August, 1 9 6 * + , In p r e s e n t i n g t h i s t h e s i s i n p a r t i a l f u l f i l m e n t of the requirements f o r an advanced degree at the U n i v e r s i t y of B r i t i s h Columbia, I agree that the L i b r a r y s h a l l make i t f r e e l y a v a i l a b l e f o r reference and study. I f u r t h e r agree that per-mission f o r extensive copying of t h i s t h e s i s f o r s c h o l a r l y purposes may be granted by the Head of my Department or by h i s r e p r e s e n t a t i v e s . I t i s understood that copying or p u b l i -c a t i o n of t h i s t h e s i s f o r f i n a n c i a l gain s h a l l not be allowed without my w r i t t e n permission* Department of Zoology The U n i v e r s i t y of B r i t i s h Columbia, Vancouver 8, Canada August, 196^ Date ABSTRACT The pineal organ i n sockeye salmon and i t s relation with other epithalamic components has been studied. Histo-logical and histochemlcal methods were used and the influence of experimental photoperiods on the histology and secretion i n the juvenile pineals investigated. Photosensory and sup-porting ependymal cells have been identified. Lipofuchsin and melanin are absent i n the pineal epithelium. Besides sensory fibres, efferent end-loops are present on the sensory and supporting c e l l s . The dorsal pineal nerve tract i s probably of a mixed type. Although the blood supply i s pro-fuse an endocrine or neuroendocrine activity i s not indicated. It i s proposed that the pineal organ i n both juveniles and adults i s photosensory and secret…
has type: Thesis/Dissertation
is shown at: 10.14288/1.0093731
language: eng
degree discipline: Zoology
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/37629