Abstract
The earliest reflex activity elicited by light tactile stimulation in the albino rat has been described.1 Further investigations have been made upon the fetuses described as non-motile in that contribution. These fetuses do not respond to light tactile stimuli or to the fixative (chemical stimulation). The younger fetuses of this period are also irresponsive to ligation of the umbilical cord (endogenous stimulation). However, the majority of the fetuses of the non-motile stage responded to strong stimulation applied by means of a porcupine quill when stimulated in the neck and fore-limb region. The responses consisted of lateral flexion of the head towards the side stimulated and extension of the fore limbs respectively. Also, some of the older fetuses of this period responded to endogenous stimulation with lateral flexion of the head only. It is evident from these observations that somatic activity, other than that elicited by light tactile stimuli, develops at an earlier period than that described in my...
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