Full Text Available

Access Repository
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Cover Image

A comparative morphological and morphometric study of the Musculi bulbi oculi and Apparatus lacrimalis in the ostrich (Struthio camelus) and emu (Dromaius novaehallandiae)

Dissertation (MSc)--University of Pretoria, 2017.

Saved in:
Other Authors: Groenewald, Hermanus B.
Format: Thesis
Language:English
Published: University of Pretoria 2018
Subjects:
UCTD
Tags: Add Tag
No Tags, Be the first to tag this record!
_version_ 1867613575212695552
access_status_str Open Access
author2 Groenewald, Hermanus B.
author_browse Groenewald, Hermanus B.
author_facet Groenewald, Hermanus B.
collection Thesis
dc_rights_str_mv © 2018 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.
description Dissertation (MSc)--University of Pretoria, 2017.
format Thesis
id oai:repository.up.ac.za:2263/65488
institution University of Pretoria (South Africa)
language English
last_indexed 2026-06-10T12:38:19.381Z
license_str Other — see source repository
provenance_str_mv Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository
publishDate 2018
publishDateRange 2018
publishDateSort 2018
publisher University of Pretoria
publisherStr University of Pretoria
record_format dspace
source_str UPSpace — University of Pretoria Institutional Repository
spelling oai:repository.up.ac.za:2263/65488 A comparative morphological and morphometric study of the Musculi bulbi oculi and Apparatus lacrimalis in the ostrich (Struthio camelus) and emu (Dromaius novaehallandiae) Groenewald, Hermanus B. elly1@mweb.co.za Kleyn, Ellené UCTD Dissertation (MSc)--University of Pretoria, 2017. The unique adaptation of the avian eye is reflected in its ocular anatomy. The ostrich and emu are commercially important species and a comparative study of the M. bulbi, lacrimal apparatus and their innervation would provide important ophthalmological data. Both species have large eye globes to which four recti, two oblique and two nictitating membrane muscles insert. Greater similarities in the origins of these muscles are evident between the two species, compared to their respective insertions. Branches of cranial nerves II to VII course within the orbit of both species, with cranial nerves II to VI innervating the eye and M. bulbi. The route of CN VI differs from that of other avian species whereas that of CN V and VII differs between the ostrich and emu. The M. bulbi in both species differ in mass, volume, isometric force and power generation, indicating possible variations in the dynamics of ocular motility. Each eye has an associated Harderian and lacrimal gland which empty at the inner margin of the nictitating membrane and lower eye lid, respectively. Morphological variation is evident, with the ostrich lacrimal apparatus being more robust, distinctly lobulated and pigmented. In both species, the lacrimal apparatus is compound in nature. A single large secretory duct extends into the body of both glands in the ostrich and emu, before branching into two to three smaller ducts into which the simple branched tubular units constituting the glands open. The secretory epithelium is simple columnar in nature. Concentrations of lymphocytes are observed in both glands confirming the general observation that the Harderian gland in particular plays an important role in local ocular immunity. The morphology and innervation of the ostrich and emu M. bulbi and Apparatus lacrimalis follow the general avian pattern. However, the small interspecies variations noted should be considered during diagnostic or surgical procedures on the eye or associated structures. Anatomy and Physiology MSc Unrestricted 2018-07-13T06:48:21Z 2018-07-13T06:48:21Z 2018/04/20 2017 Dissertation Kleyn, E 2017, A comparative morphological and morphometric study of the Musculi bulbi oculi and Apparatus lacrimalis in the ostrich (Struthio camelus) and emu (Dromaius novaehollandiae), MSc Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/65488> A2018 http://hdl.handle.net/2263/65488 en © 2018 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria
spellingShingle UCTD
A comparative morphological and morphometric study of the Musculi bulbi oculi and Apparatus lacrimalis in the ostrich (Struthio camelus) and emu (Dromaius novaehallandiae)
title A comparative morphological and morphometric study of the Musculi bulbi oculi and Apparatus lacrimalis in the ostrich (Struthio camelus) and emu (Dromaius novaehallandiae)
title_full A comparative morphological and morphometric study of the Musculi bulbi oculi and Apparatus lacrimalis in the ostrich (Struthio camelus) and emu (Dromaius novaehallandiae)
title_fullStr A comparative morphological and morphometric study of the Musculi bulbi oculi and Apparatus lacrimalis in the ostrich (Struthio camelus) and emu (Dromaius novaehallandiae)
title_full_unstemmed A comparative morphological and morphometric study of the Musculi bulbi oculi and Apparatus lacrimalis in the ostrich (Struthio camelus) and emu (Dromaius novaehallandiae)
title_short A comparative morphological and morphometric study of the Musculi bulbi oculi and Apparatus lacrimalis in the ostrich (Struthio camelus) and emu (Dromaius novaehallandiae)
title_sort comparative morphological and morphometric study of the musculi bulbi oculi and apparatus lacrimalis in the ostrich struthio camelus and emu dromaius novaehallandiae
topic UCTD
url http://hdl.handle.net/2263/65488

Similar Items