the ontogenetic development of afferent ( supraspinal and propriospinal ) as well as efferent ( ascending ) fiber connections of the spinal cord was examined following the injection of horseradish peroxidase ( hrp ) or wheat germ agglutinin hrp ( wga-hrp ) into the cervical and lumbar spinal cords ( or brains ) of embryos ranging in age from 4 to 14 days of incubation .
C0037925
spinal cord
C0581621
lumbar spinal cords