the cs axons of neurons situated in the medial prefrontal cortex have reached the first thoracic segment ( t1 ) at postnatal day 3 ( p3 ) and reach their most caudal extension in the spinal cord sixth thoracic segment ( t6 ) at postnatal day 7 ( p7 ) and then gradually disappear during the second postnatal week .
C0004461
axons
C0027882
neurons