[The paracommissural regions (brain neurohemal formations) of diplopods. Preliminary note]

The paracommissural plates of Diplopods are neurohemal "organs" anatomically not individualized in bodies separate from the brain. They lie near the transverse commissure (tritocerebral commissure s.l.). They are composed of at least two distinct types of axon terminals, glial cells, tracheae and a neural lamella facing a blood sinus. The axons of paracommissural plates of originate in neurosecretory cells lying in the ganglions of the transverse commissure. The release of granules partly occurs by exocytosis.

[The concept of renal dysplasia. Apropos of 67 cases]

The aim of this study, based upon 130 nephrectomies in children, was to emphasise the importance of congenital lesions in comparison with inflammatory lesions. In the context of congenital abnormalities, the abundance of our material made it possible for us to review our anatomical findings in the context of clinical and radiological data. This had led us to propose an anatomical classification of renal dysplasias. Although overlap cases exist, this classification into four separate entities according to the nature and extent of the histological and topographical lesions is satisfactory by virtue of its clarity. It is an agreement with the most recent publications of authors interested in the vast problem of renal malformations.

[Discharge frequency of tendon organs evoked by the contraction of motor units in the cat]

Isolated contraction of several motor units can excite a single tendon organ. Although the rate of receptor discharge may be different for each motor unit, it is not related to the tension. During repetitive stimulation of a motor unit at increasing frequency the receptor discharge reaches a maximum at rates below fusion frequency for that motor unit.