東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Comparative Anatomy of Orbital Struc...

Meshida, Keiko.

FindBook

Google Book

Amazon

博客來

Comparative Anatomy of Orbital Structures in Cetaceans.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Comparative Anatomy of Orbital Structures in Cetaceans./
作者:	Meshida, Keiko.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	256 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-05, Section: B.
Contained By:	Dissertations Abstracts International80-05B.
標題:	Morphology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10973709
ISBN:	9780438603998

Comparative Anatomy of Orbital Structures in Cetaceans.
Meshida, Keiko.

Comparative Anatomy of Orbital Structures in Cetaceans. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 256 p.

Source: Dissertations Abstracts International, Volume: 80-05, Section: B.

Thesis (Ph.D.)--Howard University, 2018.

This item must not be added to any third party search indexes.

This study examines extraocular (hereafter, EOM) and orbital muscles as well as orbital neurovascular structures of marine mammals to begin distinguishing oculomotor characters shared with phylogenetic outgroups from ones that are uniquely adapted to life in aquatic environments. The project has identified new structures, including circular muscle layers encircling the orbit and multiple insertions of the oblique muscles. This study seeks to determine the phylogenetic and functional significance of rectus EOMs, newly re-identified smooth circular muscle layers, and the retractor bulbi muscle in relation to the architecture of the bony orbit. In addition to microdissection of the orbital contents, histological analysis (H&E and Masson's Trichrome) and MRI including Diffusion Tensor Imaging techniques were used. The circular muscle has multiple layers (external and internal), with the external layers appearing to correspond to Muller's (1858) orbitalis muscle. The function of this muscle is to protrude the eyeball from the bony orbit as an antagonist to the retractor bulbi (RB) muscle. The rectus EOMs have two portions, scleral and palpebral. The palpebral portions are massive and fused together. They insert into the eyelid while the scleral bellies are rudimental except the medial rectus (MR) in some odontocete species. Judging from direct observation of captive dolphins (Tursiops truncatus), the function of the palpebral portion of rectus EOMs is to move the entire orbital contents. The rudimental and fibrous scleral bellies have little function in terms of moving the globe, except MR. Instead, both superior and inferior oblique muscles are muscular throughout their course up to the scleral insertion. This supports my hypothesis that the oblique muscles are mainly responsible for moving the eyeball, together with a muscular MR in some Odontoceti. This is entirely consistent with their locomotion style, which is up-and-down undulation. The superior oblique is in action when the animal's head turns downward, while the inferior oblique contracts when the head turns upwards. The scleral belly of MR is better developed in shallow-diving species than in deep divers, due to the formers' greater dependence on frontal vision. In addition to the ophthalmic retia mirabilia which surround the optic nerve, additional vascular networks were found between the RB and rectus EOMs. They may have the additional function in cetaceans of keeping the eyeball from cooling.

ISBN: 9780438603998Subjects--Topical Terms:

591167
Morphology.

Comparative Anatomy of Orbital Structures in Cetaceans.
LDR:03616nmm a2200337 4500 001 2207024
005 20190913102433.5
008 201008s2018 ||||||||||||||||| ||eng d
020 $a 9780438603998
035 $a (MiAaPQ)AAI10973709
035 $a (MiAaPQ)howard:11551
035 $a AAI10973709
040 $a MiAaPQ $c MiAaPQ
100 1 $a Meshida, Keiko. $3 3433953
245 1 0 $a Comparative Anatomy of Orbital Structures in Cetaceans.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2018
300 $a 256 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-05, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Domning, Daryl P.
502 $a Thesis (Ph.D.)--Howard University, 2018.
506 $a This item must not be added to any third party search indexes.
506 $a This item must not be sold to any third party vendors.
520 $a This study examines extraocular (hereafter, EOM) and orbital muscles as well as orbital neurovascular structures of marine mammals to begin distinguishing oculomotor characters shared with phylogenetic outgroups from ones that are uniquely adapted to life in aquatic environments. The project has identified new structures, including circular muscle layers encircling the orbit and multiple insertions of the oblique muscles. This study seeks to determine the phylogenetic and functional significance of rectus EOMs, newly re-identified smooth circular muscle layers, and the retractor bulbi muscle in relation to the architecture of the bony orbit. In addition to microdissection of the orbital contents, histological analysis (H&E and Masson's Trichrome) and MRI including Diffusion Tensor Imaging techniques were used. The circular muscle has multiple layers (external and internal), with the external layers appearing to correspond to Muller's (1858) orbitalis muscle. The function of this muscle is to protrude the eyeball from the bony orbit as an antagonist to the retractor bulbi (RB) muscle. The rectus EOMs have two portions, scleral and palpebral. The palpebral portions are massive and fused together. They insert into the eyelid while the scleral bellies are rudimental except the medial rectus (MR) in some odontocete species. Judging from direct observation of captive dolphins (Tursiops truncatus), the function of the palpebral portion of rectus EOMs is to move the entire orbital contents. The rudimental and fibrous scleral bellies have little function in terms of moving the globe, except MR. Instead, both superior and inferior oblique muscles are muscular throughout their course up to the scleral insertion. This supports my hypothesis that the oblique muscles are mainly responsible for moving the eyeball, together with a muscular MR in some Odontoceti. This is entirely consistent with their locomotion style, which is up-and-down undulation. The superior oblique is in action when the animal's head turns downward, while the inferior oblique contracts when the head turns upwards. The scleral belly of MR is better developed in shallow-diving species than in deep divers, due to the formers' greater dependence on frontal vision. In addition to the ophthalmic retia mirabilia which surround the optic nerve, additional vascular networks were found between the RB and rectus EOMs. They may have the additional function in cetaceans of keeping the eyeball from cooling.
590 $a School code: 0088.
650 4 $a Morphology. $3 591167
650 4 $a Aquatic sciences. $3 3174300
690 $a 0287
690 $a 0792
710 2 $a Howard University. $b Anatomy. $3 1025260
773 0 $t Dissertations Abstracts International $g 80-05B.
790 $a 0088
791 $a Ph.D.
792 $a 2018
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10973709