Search

The aim of this study is to present the variations of nervus abducens in localization and number as it pierces the clival dura mater. The calvaria of 16 cadaveric heads were removed by making horizontal incisions from Glabella to Inion in both sides of the head. The dura mater was dissected. Cerebrum and cerebellum were taken out by obtuse dissection. Dissections of cavernous sinus were made under the stereomicroscope and the findings were photographed. Out of 16 specimens, one of them was excluded. Fifteen heads were bilaterally analyzed. Analysis of these nerves presented four different variations. Variation types a classified CN VI as a single trunk and entering a single dural pore with 77% occurrence. Variation type b classified CN VI with two branches running in the petroclival region and entering a single dural pore with 10% occurrence. Variation type c classified CN VI as 2 trunks and entering 2 separate but close dural pores with 10% occurrence. Variation type d classified CN VI with 2 distinct trunks and 2 branches entering 2 separate but close dural pores with 3% occurrence. CN VI plays a major role in the clinic of the eye. Due to its intracranial and extracranial course, injuries to the head and to the nerve may result in malfunctioning of the lateral muscles of the eye. Therefore, the variations of branching, relations and its course were analyzed.

Background Variations seen on the aortic arch can have certain implications for some clinical conditions, including when performing invasive procedures on the superior mediastinum and neck region. Methods We herein report a variant aortic arch branching pattern observed on dissection of an 82-year-old white male whose primary cause of death was reported as cardiovascular disease. We collected 25 anatomic specimens’ (4%) during routine dissection in our anatomy laboratory. Results The left vertebral artery directly arose from the aortic arch medial to the left subclavian artery and lateral to the left common carotid artery. In addition, the left vertebral artery had a long prevertebral course before ascending deeply to enter the transverse foramen of the cervical vertebrae at the level of the laryngeal prominence, which corresponds to the C5 vertebral level. Conclusion In this study, we aimed to determine whether knowledge of the aberrant branching pattern of the aortic arch would be useful during cardiothoracic surgery and radiological procedures in the thoracic area.

In the developing cerebellum, generation times of macroneurons and microneurons occur during pre- and postnatal period, respectively. In this study, to investigate the effects of prenatal stress exposure on cerebellar neuronal development, the granule-to-Purkinje cell ratio of stressed animals was compared with their age-matched controls. In the experimental group, pregnant dams were immobilized on their gestational day 7 and 14, for 6 h. The cerebella of the offspring were removed at postnatal day (P) 30, and granule-to-Purkinje cell ratios, obtained by dividing the numerical density of granule cells (NVg) by that of Purkinje cells (NVP), were found significantly reduced (24%) in the stressed animals. Since volume fraction of granular to molecular layer or white matter to whole cortex was not affected from stress exposure, the deficit seen in this ratio reflects an existent increase in the numerical density of Purkinje cells, rather than a decrease in the number of granule cells. In parallel, the linear density of Purkinje cells (NBP) and the percentage of proliferating cells, immunolabeled with BrdU, were also found significantly higher in stressed animals. Taken together, our results demonstrate that intrauterine stress changes the morphology and numerical density of cerebellar neurons by primarily affecting the actively dividing cells during the selected stress period.

Summary Medical schools have a long history in Ottoman-Turkish medical education. At Ottoman medical schools (medreses), education has been given to students regularly. But because of social dogma and oppression of religion on the science of human anatomy they could not get a chance to improve for centuries. Traditionally, Ottoman-Turkish medical education was shaped under the influence of Galenos (129–200) and Avicenna (980–1037). These influences continued until the beginning of the 19 th century. In this period, Avicenna's most famous medical book “Kanun-i fit-tip” was a main anatomy textbook in medical education of the eleventh century. Modernization of educational systems in the Ottoman Empire started during the reign of Sultan Selim the 3 rd (1789–1807) and modern anatomy in Ottoman-Turkish Medicine has flourished following the Austrian physicians. Today's Department of Anatomy at Istanbul Medical School of the Istanbul University is a continuation of Galatasaray Medical School which was the first medical school achieving the western educational level.

This work presents a new device, developed and constructed for the determination of the masticatory forces. Our new apparatus worked well in measuring maximal bite force and masticatory efficiency of incisor and molar teeth, respectively. The obtained results related to intraoral forces were very similar to the values previously given in the literature.