our qualitative observations revealed that polyribosomes appeared primarily in two locations within the dendrite : ( 1 ) beneath the base of identified spines just subjacent to the intersection of the spine neck with the main dendritic shaft and ( 2 ) beneath mounds in the dendritic membrane which had the appearance of the base of a spine which extended out of the plane of section .
C0728985
spine neck
C0037949
spine