No abstract available.
Aging* ; Anatomy, Comparative* ; Animals*

Animal shoulder models are important in the investigation of the natural history of various pathologic conditions and for evaluation of the effectiveness of different treatments and biomaterials. The characteristics of animal shoulder models that may be used for rotator cuff related experiments are different with regard to the anatomy, behavioral pattern, advantages and disadvantages in application to each other. The lower primates and all the non-primate species, except the tree kangaroo, were neither functional overhead nor had a true rotator cuff. Utilizing more advanced primates, or perhaps even the tree kangaroo would be ideal and the most relevant to man as they possess a true rotator cuff. However, ethical concerns, costs, and many limitations in obtaining primates generally preclude the use of these animals for such research. Finally we should consider the differences in comparative anatomy and behavioral pattern of each animal model during performance or interpretation of rotator cuff experiments.
Anatomy, Comparative ; Animals ; Biocompatible Materials ; Macropodidae ; Models, Animal ; Natural History ; Primates ; Rotator Cuff* ; Shoulder*

Sheep are commonly used as a model for human spinal orthopaedic research due to their similarity in morphological and biomechanical features. This study aimed to document the volumes of vertebral bodies and compare the generated results as well as morphometry of the sheep lumbar spine to human published data. For this purpose, computed tomography scans were carried out on five adult Merino sheep under general anaesthesia. Transverse 5 mm thick images were acquired from L1 to L6 using a multi-detector-row helical CT scanner. Volume measurements were performed with dedicated software. Four spinal indices and Pavlov's ratio were calculated. Thereafter, the generated data were compared to published literature on humans. The mean vertebral body volume showed an increase towards the caudal vertebrae, but there were no significant differences between the vertebral levels (P>0.05). Compared to humans, sheep vertebral body volumes were 48.6% smaller. The comparison of absolute values between both species revealed that sheep had smaller, longer and narrower vertebral bodies, thinner intervertebral discs, narrower spinal canal, longer transverse processes, shorter dorsal spinous processes and narrower, higher pedicles with more lateral angulations. The comparison of the spinal indices showed a good similarity to human in terms of the vertebral endplates and spinal canal. The results of this study may be helpful for using the sheep as a model for human orthopaedic spinal research if anatomical differences are taken into account.
Adult ; Anatomy, Comparative ; Humans* ; Intervertebral Disc ; Sheep* ; Spinal Canal ; Spine* ; Tomography, Spiral Computed

Although Aristotle is commonly known as a theoretical philosopher and a logician, he was also a great natural scientist. Actually in modern terms he was the first ever anatomist who originated anatomy. Despite the fact that he didn't directly dissect humans, he observed parts of fetus and tried systematic analysis of animal bodies. The achievements he has accomplished in human anatomy and animal comparative anatomy are countless. He accurately described organs and built a foundation for presenting scientific reasons in anatomical research. Furthermore, he made modern nomenclature which is still being used today and his observational skills were so precise it was hard to even believe. Even though there were a lot of errors in his physiological concepts, his structural descriptions about organs and body parts were the best at that time. The aim of this article is to discuss how Aristotle's anatomy and philosophy are closely related. It's aim is to take a look at his anatomical achievements, errors and Aristotelian philosophy in its bearing on anatomical thoughts. In addition, the goal is to knowledge today's anatomists about Aristotle's astonishing achievements as a great pioneer in anatomy.
Anatomists ; Anatomy, Comparative ; Animals ; Biology ; Embryology ; Fetus ; Human Body ; Humans ; Philosophy* ; Physiological Phenomena

The three-dimensional (3D) structure of the brain needs to be understood for accurate diagnosis and treatment of brain diseases. The brain of a cadaver may not always be available for dissection when it is needed. To overcome this problem, we attempted to create a 3D image and virtual dissection program of the brain using a Korean cadaver. The brain extracted from a Korean male cadaver was embedded in gelatin solution. 130 MRI of the brain were taken and 130 serially-sectioned specimens were made. All of MRI and specimens were inputted into the computer, and 10 brain components were manually segmented. A 3D image and virtual dissection program of the brain was made. Various virtual dissection functions were established, such as 1) sectioning the 3D image of the brain at free angles to represent its plane as a real image, segmented image, and MRI, 2) identifying the brain components represented in the sectioned plane, and 3) rotating the 3D image of the whole brain or the selected brain components at free angles. The resulting virtual dissection program of the brain is helpful in better understanding the 3D location and shape of the brain components and it is expected to be used as a CD-title or through Internet as an educational tool for medical students and doctors.
Brain/anatomy & histology* ; Comparative Study ; Diagnostic Imaging* ; Dissection* ; Human ; Male ; Middle Age ; Software* ; User-Computer Interface*

Variations of the dural folds and the dural venous sinuses are infrequently reported in the existing medical literature. Such variations in the posterior cranial fossa may pose difficulties in various analytical and surgical procedures of this region. We present a rare concurrent variation of the falx cerebelli and tentorium cerebelli that was detected during routine dissection of an adult male cadaver. While removing the brain, a partial duplication of tentorium cerebelli was observed below the left half of the tentorium cerebelli and above the left cerebellar hemisphere. This fold did not have any dural venous sinus in it. Further, a complete duplication of falx cerebelli with a single occipital venous sinus within its attached border was also observed. We present the review of literature and discuss the comparative anatomy of this case.
Adult ; Anatomy, Comparative ; Brain ; Cadaver ; Cranial Fossa, Posterior ; Dura Mater ; Humans ; Male ; Meninges ; Spinal Cord

Animal shoulder models are important in the investigation of the natural history of various pathologic conditions and for evaluation of the effectiveness of different treatments and biomaterials. The characteristics of animal shoulder models that may be used for rotator cuff related experiments are different with regard to the anatomy, behavioral pattern, advantages and disadvantages in application to each other. The lower primates and all the non-primate species, except the tree kangaroo, were neither functional overhead nor had a true rotator cuff. Utilizing more advanced primates, or perhaps even the tree kangaroo would be ideal and the most relevant to man as they possess a true rotator cuff. However, ethical concerns, costs, and many limitations in obtaining primates generally preclude the use of these animals for such research. Finally we should consider the differences in comparative anatomy and behavioral pattern of each animal model during performance or interpretation of rotator cuff experiments.
Anatomy, Comparative ; Animals ; Biocompatible Materials ; Macropodidae ; Models, Animal ; Natural History ; Primates ; Rotator Cuff ; Shoulder

PURPOSE: The purpose of this study was to evaluate the anatomical similarity of three-dimensional (3D) morphometric parameters between right and left knees. MATERIALS AND METHODS: Ten fresh-frozen paired cadaveric knees were tested. Following dissection, footprint areas of the anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL) were measured. Surface scanning was performed using a 3D scanner. Scanned data were reproduced and morphometric parameters were measured on specialized software. After making mirror models, we compared footprint center positions of the ACL and PCL of both sides and calculated the average deviation of 3D alignment between the right- and left-side models. RESULTS: No significant side-to-side differences were found in any morphometric parameters. Bony shapes displayed a side-to-side difference of < 1 mm. Distal femoral and proximal tibial volumes did not present side-to-side differences, either; the average 3D deviations of alignment between the right and left sides were 0.8±0.4/1.1±0.6 mm (distal femur/proximal tibia). Center-to-center distances between the right and left ACL footprints were 2.6/2.7 mm (femur/tibia) for the anteromedial bundle and 2.4/2.8 mm for the posterolateral bundle. They were 1.9/1.5 mm for the anterolateral bundle and 2.2/1.8 mm for the posteromedial bundle of the PCL. CONCLUSIONS: There was a remarkable 3D morphometric similarity between right and left knees. Our results might support the concept of obtaining morphologic reference data from the uninvolved contralateral knee.
Anatomy, Comparative ; Anterior Cruciate Ligament ; Cadaver ; Imaging, Three-Dimensional ; Knee Joint ; Knee ; Posterior Cruciate Ligament

We conducted an investigation of the relation between RNFL thickness and optic disc size along with an interocular comparison of optic disc size, RNFL thickness, and RNFL density in healthy subjects. A total of 64 normal eyes from 32 Korean volunteers were enrolled in this study. A GDx Nerve Fiber Analyzer with software version 2.0.09 was used to image all subjects. Optic disc size was measured by pi x (horizontal radius) x (vertical radius). The RNFL density of each quadrant was calculated by dividing each quadrant integral by the total integral. Optic disc size was positively correlated with the total RNFL thickness (r = 0.615, p < 0.01). Optic disc size and RNFL density were inversely related in the superior quadrant (r = -0.248, p < 0.05). There was a significant positive correlation between optic disc size and RNFL density in the nasal quadrant (r = 0.439, p < 0.01) and the temporal quadrant to a certain degree. A significant positive correlation was found between the right and left eyes in terms of total RNFL thickness in and that of each quadrant. Interocular RNFL density was positively correlated in both the temporal and nasal quadrants. These findings must be considered when one evaluates and compares RNFL measurements between two eyes as is often the case where both eyes are usually affected in the course of glaucomatous RNFL damage.
Adult ; Comparative Study ; Female ; Human ; Lasers/diagnostic use ; Male ; *Nerve Fibers ; Optic Disk/*anatomy & histology ; Optic Nerve/*anatomy & histology ; Perimetry ; Weights and Measures

Although various animals have been used as models of cardiac valvular diseases in humans, the structural characteristics of cardiac valves in animals remain unclear. In this study, we investigated cardiac valves in representative animal models for the purpose of comparative anatomy. Adult hearts from three dogs, four goats, six rabbits, and six fowls were fixed with 10% neutral-buffered formalin and analyzed gross-anatomically. Cardiac appearance was spherical or oval in dogs, goats, and rabbits, whereas it had a long conical shape in fowls. Left atrioventricular (AV) valve was composed of membranous septal and parietal cusps connected to two papillary muscles in all animals. The right AV valve was composed of membranous septal, parietal, and angular cusps with three papillary muscles in dogs and goats, membranous septal and parietal cusps attached to four papillary muscles in rabbits, and a single muscular plate without any papillary muscles and chorda tendinae in fowls. Aortic valves with thin membranous right, left, and septal semilunar cusps in dogs, goats, and rabbits had a thick membrane with a bended free border in fowls. Pulmonary valve (PV) with membranous right, left, and intermediate semilunar cusps made a large central hole by being closely attached to the surrounding wall in dogs, goats, and rabbits, whereas it protruded into half of the lumen as a thick membrane in fowls. The membranous cusp of the PV was composed of several layers in dogs and goats but was a single layer in rabbits and fowls. These findings indicate that even if animals have two completely separated atria and ventricles each, cardiac valves have species-specific morphological characteristics, especially between mammals and fowls.
Adult ; Anatomy, Comparative ; Animals ; Aortic Valve ; Dogs ; Formaldehyde ; Goats ; Heart ; Heart Valves* ; Humans ; Mammals ; Membranes ; Models, Animal ; Papillary Muscles ; Pulmonary Valve ; Rabbits ; Rabeprazole