BACKGROUND AND PURPOSE Little information is available regarding the anatomy of the intracranial veins and sinuses that can be shown on MR venograms of children. The aim of this study was to determine the normal venous anatomy and anatomic variants. METHODS Fifty children who were referred for investigation of developmental delay and who had normal results of MR imaging of the brain were recr...

Early postreceptoral color vision is thought to be organized in terms of two principal axes corresponding to opposing L- and M-cone signals (LvsM) or to S-cone signals opposed by a combination of L- and M-cone signals (SvsLM). These cone-opponent axes are now widely used in studies of color vision, but in most cases the corresponding stimulus variations are defined only theoretically, based on ...

Variations of the quadrigeminal plate (mesencephalic tectum) were determined on midline sagittal MR images of the brain in 93 patients without known mesencephalic abnormalities and in 10 patients with known aqueductal stenosis or obstruction. Measurements of the thicknesses of the superior and inferior colliculi and the length of the tectum were made on the midline sagittal section. Images were...

We examined individual differences in the color appearance of nonspectral lights and asked how they might be related to individual differences in sensitivity to chromatic stimuli. Observers set unique hues for moderately saturated equiluminant stimuli by varying their hue angle within a plane defined by the LvsM and SvsLM cone-opponent axes that are thought to characterize early postreceptoral ...

purpose: to evaluate diurnal variations in intraocular pressure (iop) in normal adult residents of yazd city.  methods: this cross-sectional study was performed on 800 eyes of 400 subjects aged between 20-80 years selected by cluster random sampling from residents of yazd city during 2004-2005. iop was measured by goldman applanation tonometer in the morning (8-9 am) and evening (8-9 pm). the d...

The clavicle, being subcutaneous, is easily examined and presents a tempting target for biopsy. This may be of both diagnostic and therapeutic value, but on occasion normal anatomical variations may lead to unnecessary operations. Two such cases are presented. Case I. A fit 28-year-old man was seen two days after a fall, complaining of pain and tenderness in the region of the sternoclavicularjo...