Neuroanatomy Of The Killer Whale (Orcinus Orca) From Magnetic Resonance Images,
Emory University
Neuroanatomy Of The Killer Whale (Orcinus Orca) From Magnetic Resonance Images, Lori Marino, Chet C. Sherwood, Bradley N. Delman, Cheuk Y. Tang, Thomas P. Naidisch, Patrick R. Hof
Veterinary Science and Medicine Collection
This article presents the first series of MRI-based anatomically labeled sectioned images of the brain of the killer whale (Orcinus orca). Magnetic resonance images of the brain of an adult killer whale were acquired in the coronal and axial planes. The gross morphology of the killer whale brain is comparable in some respects to that of other odontocete brains, including the unusual spatial arrangement of midbrain structures. There are also intriguing differences. Cerebral hemispheres appear extremely convoluted and, in contrast to smaller cetacean species, the killer whale brain possesses an exceptional degree of cortical elaboration in the insular cortex, temporal …
The Spinal Nerves And Spinal Cord Of The Frog,
Marquette University
The Spinal Nerves And Spinal Cord Of The Frog, Laverne A. Penn
Bachelors’ Theses
The common grass frog, Rana pipiens as wall as the bull frog, Rana catesbiana have served during many decades as material from which both the student of zoology and the investigator in biological problems have gathered valuable information about the anatomy and physiology of the common systems. Among these systems the central, peripheral, and sympathetic nervous system plays a coordinating role, because of the ramifying nature of its organization. It is the purpose of this thesis to investigate the gross and histological structure of these branches known as spinal nerves. When one inspects the literature on the nervous system of …
Normal Thymus Evaluation Using Radiographs And Computed Tomographic Images In Young And Adult Dogs,
College of Veterinary Medicine, Kyungpook National University
Normal Thymus Evaluation Using Radiographs And Computed Tomographic Images In Young And Adult Dogs, Yoenhee Park, Sang-Kwon Lee, Sooyoung Choi, Hojung Choi, Youngwon Lee, Kija Lee
The Thai Journal of Veterinary Medicine
The thymus generally presents as a sail-shaped soft-tissue opacity on thoracic radiographs in young, pre-pubescent dogs. After puberty, lymphatic tissue is replaced by adipose tissue and can usually no longer be identified on radiographs; however, thymic remnants have often been observed in adult dogs. The objective of this retrospective descriptive study was to investigate the incidence of thymic remnants using thoracic radiographs and to analyze the incidence in dogs by age, sex and breed. We analyzed the data from 1,464 dogs that underwent both thoracic ventrodorsal and right lateral radiography, of which 40 underwent both radiography and computed tomography (CT). …
Hair Whorls In The Dog (Canisfamiliaris). I. Distribution,
University of Sydney
Hair Whorls In The Dog (Canisfamiliaris). I. Distribution, Lisa M. Tomkins, Paul Mcgreevy
Anatomy Collection
Hair whorl characteristics were assessed in the domestic dog (Canis familiaris) in the regions of cephalic, cervical (dorsal, ventral, and lateral), thoracic and brachial axillary regions, the chest, shoulders, elbows, ventral abdominal region, and on the caudal thighs (ischiatic). They were classified as simple or tufted, and their position was recorded as the distance between their centers and bony landmarks within each region. The distribution of whorls was explored in a cohort of domestic dogs (N = 120) comprising a variety of breeds and cross‐breeds, sourced from shelters (N = 60) and the general public (N = 60). …
Diagnosis, Treatment, Genetic Basis, And Prevention Of Canine Hip Dysplasia,
Liberty University
Diagnosis, Treatment, Genetic Basis, And Prevention Of Canine Hip Dysplasia, Nathaniel R. Woody
Senior Honors Theses
Canine Hip Dysplasia (CHD) is a genetic disorder that results in an improper formation of the hip joint. This results in joint laxity, which eats away at the cartilage of the acetabulum. CHD causes arthritis, making normal walking painful for dogs. CHD is the result of many different genes and mutations working together. The best way to prevent CHD in dogs is to selectively breed animals who are not genotypic for the mutation. For dogs that already carry the mutation responsible for CHD the earlier the diagnosis and treatment the better chance they have of a full pain free life …
Cetacean Brains: How Aquatic Are They?,
Emory University
Cetacean Brains: How Aquatic Are They?, Lori Marino
Anatomy Collection
The adaptation of cetaceans to a fully aquatic lifestyle represents one of the most dramatic transformations in mammalian evolutionary history. Two of the most salient features of modern cetaceans are their fully aquatic lifestyle and their large brains. This review article will offer an overview of comparative neuroanatomical research on aquatic mammals, including analyses of odontocete cetacean, sirenian, pinniped, and fossil archaeocete brains. In particular, the question of whether a relationship exists between being fully aquatic and having a large brain is addressed. It has been hypothesized that the large, well‐developed cetacean brain is a direct product of adaptation to …
The Lungs And Respiration In The Frog,
Marquette University
The Lungs And Respiration In The Frog, Peter P. Strassburg
Bachelors’ Theses
In a wide sense, respiration is sometimes defined as the gaseous exchange constantly taking place between an organism and its environment. Essentially it is concerned with the intake of oxygen and the output of carbon dioxide but it also includes any other gas exchange that might occur. Small organisms take oxygen directly from the air or from the watery medium surrounding them into all parts of their structures. They also give off carbon dioxide from all their parts directly into the surrounding medium. They can do this successfully because they are small enough to have every cell in direct or …
The Evolutionary History Of Cetacean Brain And Body Size,
University of Cambridge
The Evolutionary History Of Cetacean Brain And Body Size, Stephen H. Montgomery, Jonathan H. Geisler, Michael R. Mcgowen, Charlotte Fox, Lori Marino, John Gatesy
Veterinary Science and Medicine Collection
Cetaceans rival primates in brain size relative to body size and include species with the largest brains and biggest bodies to have ever evolved. Cetaceans are remarkably diverse, varying in both phenotypes by several orders of magnitude, with notable differences between the two extant suborders, Mysticeti and Odontoceti.We analyzed the evolutionary history of brain and body mass, and relative brain size measured by the encephalization quotient (EQ), using a data set of extinct and extant taxa to capture temporal variation in the mode and direction of evolution. Our results suggest that cetacean brain and body mass evolved under strong directional …
Expression Of Follicle Stimulating And Luteinizing Hormone Receptors In Porcine Testes After Timing The First Vaccination For Immunocastration,
Faculty of Veterinary Science, Chulalongkorn University
Expression Of Follicle Stimulating And Luteinizing Hormone Receptors In Porcine Testes After Timing The First Vaccination For Immunocastration, Sayamon Srisuwatanasagul, Rungrueang Yodsheewan, Amornthep Archawakulathep, Suvaluk Seesupa, Kongkiat Srisuwatanasagul, Atthaporn Roongsitthichai, Siriluck Juntautsa
The Thai Journal of Veterinary Medicine
This study aimed to examine the expression of follicle stimulating hormone receptor (FSHR) and luteinizing hormone receptor (LHR) in the testes of male fattening pigs based on the timing of the first immunocastration dose. A total of 24 male pigs were randomly assigned to 3 groups: C (n=8) consisted of only intact pigs, T1 (n=8) contained those immunocastrated at 15 and 19 weeks of age, and T2 (n=8) was composed of those immunocastrated at 9 and 19 weeks of age. The expression of FSHR and LHR was evaluated using H-score from immunohistochemistry and protein band intensity from Western blotting. Immunohistochemistry …
The Anatomy Of The Oyster,
Marquette University
The Anatomy Of The Oyster, M.J. Rohlinger
Bachelors’ Theses
The phylum Mollusca manifests the following characteristics: bilateral symmetry; three primary germ layers; free-living and sessile; marine and fresh-water; a shell modified to form either a bivalve or a univalve which gives an appearance of segmentation due to rings of growth or arrangement of certain parts of the shell as is seen in the class Amphineura, this is only apparent metamerism because the Mollusca are considered to be unsegmented animals; a coelom poorly developed; a foot; a mantle cavity; well developed digestive, circulatory, excretory, and reproductive systems. When one inspects a Chiton, an oyster, a snail, an octopus, or a …
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