Assertion: thalamus | /r/HasProperty | cortex
Facets:
Source sentences:
text: While evidence exists of pain receptors appearing as early as five weeks after conception and the child responding to touch as early as week six, even those who hold out for the development of the whole fetal sensory system--pain receptors, nerve tracts, spinal cord, thalamus , cortex--had to grant that all these were in place by the child's twentieth week of life.