Segmental projection from muscle spindles: a perspective from the upper cervical spinal cord

The segmental connections of muscle spindle afferents originating from primary endings do not follow the same pattern at all levels of the spinal cord. This review is concerned with the characteristics of neck muscle spindle projections, which illustrate several differences between their segmental organization and the arrangement of hindlimb muscle spindle afferents in the lumbosacral spinal cord.     

Observations and Comments Concerning the Isolation of Group B β-Hemolytic Streptococci from Human Sources

A marked increase in the isolation of Group B streptococci from patients in the University Hospital, Saskatoon, has been noted over the past four years, and no change in technical methods has been found to explain this increase. Group B streptococci have been isolated from 242 patients, in 53 of whom the streptococcus was considered the cause of the infection. Infections occurred predominantly in the urinary tract, female genital tract and upper respiratory tract. There was a low incidence of infections in newborn infants, and only four infections were in patients under 1 year old. Infections were more frequent in women than men and in patients over 40 years of age. No particular affinity of Group B streptococci for diabetics was demonstrated.     

Calculated calibrations for ion chambers fabricated from plastics simulating air and muscle; determination of W and tauRa

An experiment is described utilizing two 16-liter ionization chambers, fabricated from electrically conducting plastics which closely simulate air and human muscle, designed to minimize most of the errors inherent in the use of cavity chambers. A careful calibration was done, using a 226Ra source in 0.5 mm platinum, in an almost scatter-free environment which permitted the derivation of accurate corrections for scatter and air attenuation. Calibrations calculated from the physical measurements of the ion chambers are compared with the experimental calibrations. Values of Wbeta for air, and muscle gas and of tauRa are derived.