Sensory Responses of Reinnervated Muscle Spindles

EXTENSIVE morphological, histochemical and electrophysiological studies have been made on skeletal muscles at varying stages of motor reinnervation. But in spite of the physiological significance of muscle receptors in controlling skeletal muscle activity, there have been no detailed studies of their reinnervation. We have therefore investigated the functional and structural characteristics of muscle spindles associated with their sensory reinnervation.     

Progesterone facilitates Implantation of Xenogenic Cultured Cells in Hamster Uterus

ATTEMPTS to explain the phenomenon of nidation on the basis of maternal immunological tolerance have recently made progress^1–4 through pre-sensitization of the mother by the tissue of the father-to-be, followed by studies of the antigenicity of fertilized ova and evaluation of the mother's antibody production. Other workers have stressed the importance of chorionic cells in nidation, based on the occurrence of intraabdominal pregnancy not involving the uterus. Chambon⁵ and Cochrane and Meyer⁶ recognized the influence of oestrogen and progesterone on uterine tissue during nidation and Psychoyos⁷ emphasized the importance of gonadal hormones in the preparation of endometrium for implantation based on delayed nidation. The role of progesterone in the formation of the decidual reaction as a prerequisite to nidation has been clearly established.