The intervertebral foramen is formed by two adjacent vertebrae and an intervertebral disc. Previous studies examining the foramen have been performed using various methods. The author obtained characteristics of the intervertebral foramen based on silicon mold. The author used 18 cadavers and dissected the lumbar intervertebral foramen. First, positional levels of the spinal nerve in the intervertebral foramen were measured. Second, after being removed all tissues covering the intervertebral, bony foramen was filled with melted silicon to mold the cross section. Subsequently, the solidified silicon mold was removed and stamped on a paper. The paper was scanned and analyzed area, perimeter, height and width of the intervertebral foramen on a computer. Area (average, 9.43 mm²) and perimeter (average, 48.02 mm) did not show any statistical significant pattern for any lumbar vertebral levels. However, the height and width significantly differed at the fifth lumbar vertebra, which had the shortest height (the fifth, 13.00 mm; average, 15.78 mm) and longest width (the fifth, 8.61 mm; average, 7.87 mm), although there were similar patterns in case of area and perimeter of the first to fourth lumbar vertebra. Height had a decrease tendency while width had an increase tendency both from the second to fifth lumbar vertebra. Spinal nerves went through near the intervertebral disc level from the first to fourth lumbar vertebra, although they passed below the disc at the fifth level. This study provides a different view of methodology for the 3-dimensional aspect for the intervertebral foramen. Results of this study may indicate that height and width of the intervertebral foramen changed along all lumbar vertebral levels; nevertheless, area and perimeter of the intervertebral foramen remained constant.
Cadaver* ; Fungi* ; Intervertebral Disc ; Silicon* ; Spinal Nerves* ; Spine

Corpus striatum is subcortical nuclei composed of caudate nucleus and putamen. It has been considered to be associated with motor control and learning. Dysfunction of the striatum is related to Huntington's disease, Tourette's syndrome, obsessive-compulsive disorder and schizophrenia. Nevertheless, standard Korean striatum volume was not set yet. Here, we report the striatum volume in healthy Korean youths. The subjects were composed of 57 youths (male, 28; female, 29). The MRI study was undertaken after a brief history taking and neurological examination. The DICOM files were imported into V-Works program. Volume models of the intracranial cavity, whole brain, caudate nucleus, and putamen were made and their volumes were calculated by the program. The average caudate volume was 7.23±1.18 cm³ in male group and 6.23±0.96 cm³ in female group. The average volume of putamen was 7.19±1.25 cm³ in male group and 6.38±0.86 cm³ in female group. Interestingly the right caudate volume is significantly larger in both group, although there is no difference in putamen volume. This study reports Korean corpus striatum volume in healthy volunteers. These results would provide an important standard reference for further study.
Adolescent* ; Brain ; Caudate Nucleus* ; Corpus Striatum ; Female ; Healthy Volunteers ; Humans ; Huntington Disease ; Learning ; Magnetic Resonance Imaging* ; Male ; Neurologic Examination ; Obsessive-Compulsive Disorder ; Putamen* ; Schizophrenia ; Tourette Syndrome

The spinal cord is part of the central nervous system, and its caudal end is named as the conus medullaris. Many researchers have reported the tip level of the conus medullaris by magnetic resonance imaging studies; others by cadaver dissection. The tip level of magnetic resonance imaging studies seemed to be higher than that of cadaver studies. We evaluated the tip level the conus medullaris with magnetic resonance imaging and cadaver dissection in Korean adult population. MR data were scanned with T1-weighted, mid-sagittal magnetic resonance imaging of 248 living persons (mean age, 42.3±16.0 years; range, 12-85 years) and cadaver data were collected by dissections of 118 cadavers (mean age, 56.0±14.9 years; range, 16-94 years). The mean level of conus tip was found to be at the middle third of 1st lumbar vertebra (range, lower third T12 - lower third L2) from magnetic resonance imaging study and the upper third of 2nd lumbar vertebra (range, lower third T12 - lower third L3) from cadaver dissection study. The tip level of conus medullaris from magnetic resonance imaging study was higher than that from cadaver dissection study (p<0.05).
Adult* ; Cadaver* ; Central Nervous System ; Conus Snail* ; Humans ; Magnetic Resonance Imaging* ; Spinal Cord* ; Spine

Epstein-Barr virus (EBV) causes a variety of central nervous system infections, including encephalitis. EBV encephalitis accounts for approximately 5.8% of all viral encephalitis, with fever, headache, convulsions, and decreased consciousness as common symptoms. Brain magnetic resonance imaging (MRI) in EBV encephalitis shows high signal intensity mainly in the parieto-occipital cortex, subcortical white matter, and deep gray matter nuclei with reversibility. In this report, we present a case of bilateral corticospinal tract involvement (wineglass sign) identified on brain MRI in a patient with diagnosed with EBV encephalitis.

Epstein-Barr virus (EBV) causes a variety of central nervous system infections, including encephalitis. EBV encephalitis accounts for approximately 5.8% of all viral encephalitis, with fever, headache, convulsions, and decreased consciousness as common symptoms. Brain magnetic resonance imaging (MRI) in EBV encephalitis shows high signal intensity mainly in the parieto-occipital cortex, subcortical white matter, and deep gray matter nuclei with reversibility. In this report, we present a case of bilateral corticospinal tract involvement (wineglass sign) identified on brain MRI in a patient with diagnosed with EBV encephalitis.

Epstein-Barr virus (EBV) causes a variety of central nervous system infections, including encephalitis. EBV encephalitis accounts for approximately 5.8% of all viral encephalitis, with fever, headache, convulsions, and decreased consciousness as common symptoms. Brain magnetic resonance imaging (MRI) in EBV encephalitis shows high signal intensity mainly in the parieto-occipital cortex, subcortical white matter, and deep gray matter nuclei with reversibility. In this report, we present a case of bilateral corticospinal tract involvement (wineglass sign) identified on brain MRI in a patient with diagnosed with EBV encephalitis.

PURPOSE: The purpose of this study was to investigate the reactions of medical students to cadaver dissection and their preferred learning methods in studying anatomy. METHODS: Participants were 110 first-year medical students 57 from a pre-medical course and 53 from the graduate entry level. A self-reported questionnaire survey was used to assess students' emotional and physical reactions to their encounters with cadavers in the dissecting room and their preferred teaching and learning methods and materials. Frequency, paired t-test, and cross-sectional analyses were conducted. RESULTS: Most students experienced negative physical symptoms, such as eye soreness (72%), mile headache or dizziness (40%), headache (18%), decrease in appetite (17%), nausea (15%), and disgust (10%), in the first encounter with a cadaver in the dissection room. They also experienced adverse emotional responses, such as surprise (38%), depression (37%), sadness (23%), fear (23%) and feelings of guilt (19%), anxiety (17%), and crying (2.7%). However, most of these reactions decreased significantly 8 weeks later, except for nausea. Regarding teaching and learning methods, students reported that lectures and cadaver dissections were the most helpful methods in studying anatomy. CONCLUSION: The results shows that initial encounters with a cadaver in the dissecting room caused emotional and physical distress to first-year medical students, but most students adapted gradually to the stressful learning environment. In addition, students regarded cadaver dissection as one of the most helpful learning experiences in studying anatomy.
Anxiety ; Appetite ; Cadaver ; Cross-Sectional Studies ; Crying ; Depression ; Dizziness ; Eye ; Guilt ; Headache ; Humans ; Learning ; Lectures ; Nausea ; Students, Medical ; Surveys and Questionnaires

Recent neuroimaging studies indicate that learning a novel motor skill induces plastic changes in the brain structures of both gray matter (GM) and white matter (WM) that are associated with a specific practice. We previously reported an increased volume of vermian lobules VI-VII (declive, folium, and tuber) in elite basketball athletes who require coordination for dribbling and shooting a ball, which awakened the central role of the cerebellum in motor coordination. However, the precise factor contributing to the increased volume was not determined. In the present study, we compared the volumes of the GM and WM in the sub-regions of the cerebellar vermis based on manual voxel analysis with the ImageJ program. We found significantly larger WM volumes of vermian lobules VI-VII (declive, folium, and tuber) in elite basketball athletes in response to long-term intensive motor learning. We suggest that the larger WM volumes of this region in elite basketball athletes represent a motor learning-induced plastic change, and that the WM of this region likely plays a critical role in coordination. This finding will contribute to gaining a deeper understanding of motor learning-evoked WM plasticity.
Athletes* ; Basketball* ; Brain ; Cerebellum* ; Humans ; Learning ; Magnetic Resonance Imaging ; Motor Skills ; Neuroimaging ; Plastics*

BACKGROUND AND PURPOSE: The etiologies and frequencies of cerebellar ataxias vary between countries. Our primary aim was to determine the frequency of each diagnostic group of cerebellar ataxia patients in a Korean population. METHODS: We reviewed the medical records of patients who were being followed up between November 1994 and February 2016. We divided patients with cerebellar ataxias into familial and non-familial groups and analyzed the frequency of each etiology. Finally, we categorized patients into genetic, sporadic, secondary, and suspected genetic, but undetermined ataxia. RESULTS: A total of 820 patients were included in the study, among whom 136 (16.6%) familial patients and 684 (83.4%) non-familial cases were identified. Genetic diagnoses confirmed 98/136 (72%) familial and 72/684 (11%) nonfamilial patients. The overall etiologies of progressive ataxias comprised 170 (20.7%) genetic, 516 (62.9%) sporadic, 43 (5.2%) secondary, and 91 (11.1%) undetermined ataxia. The most common cause of ataxia was multiple-system atrophy (57.3%). In the genetic group, the most common etiology was spinocerebellar ataxia (152/170, 89.4%) and the most common subtype was spinocerebellar ataxia-3.38 of 136 familial and 53 of 684 sporadic cases (91/820, 11.1%) were undetermined ataxia. CONCLUSIONS: This is the largest epidemiological study to analyze the frequencies of various cerebellar ataxias in a Korean population based on the large database of a tertiary hospital movement-disorders clinic in South Korea. These data would be helpful for clinicians in constructing diagnostic strategies and counseling for patients with cerebellar ataxias.
Ataxia ; Atrophy ; Cerebellar Ataxia* ; Counseling ; Diagnosis ; Epidemiologic Studies ; Friedreich Ataxia ; Humans ; Korea ; Medical Records ; Spinocerebellar Ataxias ; Tertiary Care Centers

Objective: Although neuroimaging studies have shown volumetric reductions, such as the anterior cingulate, prefrontal cortices, and hippocampus in patients with major depressive disorder (MDD), few studies have investigated the volume of or shape alterations in the subcortical regions and the brainstem. We hypothesized that medication-naïve female adult patients with MDD might present with shape and volume alterations in the subcortical regions, including the brainstem, compared to healthy controls (HCs). Methods: A total of 20 medication-naïve female patients with MDD and 21 age-matched female HCs, underwent 3D T1-weighted structural magnetic resonance scanning. We analyzed the volumes of each subcortical region and each brainstem region, including the midbrain, pons, and medulla oblongata. We also performed surface-based vertex analyses on the subcortical areas and brainstem. Results: Female patients with MDD showed non-significant volumetric differences in the subcortical regions, whole brainstem, and each brainstem region compared to the HCs. However, in the surface-based vertex analyses, significant shape contractions were observed in both cerebellar peduncles located on the lateral wall of the posterior brainstem [threshold-free cluster enhancement, corrected for family-wise error (FWE) at p<0.05] in patients with MDD. Conclusion We revealed shape alterations in the posterior brainstem in female patients with MDD.