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The density of spines on apical dendrites of pyramidal neurons of which the soma was located in layer III of area 17 of human visual cortex was measured. This was done in Golgi-impregnated sections from a series of brains from foetal age 33 weeks to 30 years postnatally by counting the number of spines on a segment of apical dendrite situated between 50 and 100 micron from the soma. In the late foetus, a mean of less than 30 spines was found in the 50 micron long segment. In the brain of a neonate about 50 spines were counted on the corresponding segment. At about 5 months postnatally the maximum number of spines is reached (approximately 80 in the segments measured), after which spine number decreases, reaching a level of about 50 again by 2 years of age, a figure that is maintained into adulthood.
A E Michel, and
L J Garey
March 2011,
Communicative & integrative biology,
A E Michel, and
L J Garey
July 2014,
The Journal of neuroscience : the official journal of the Society for Neuroscience,
A E Michel, and
L J Garey
January 1967,
Experimental brain research,
A E Michel, and
L J Garey
July 1987,
Arkhiv anatomii, gistologii i embriologii,
A E Michel, and
L J Garey
January 1978,
Verhandlungen der Anatomischen Gesellschaft,
A E Michel, and
L J Garey
January 1987,
Acta neuropathologica,
A E Michel, and
L J Garey
January 1972,
Neuroscience and behavioral physiology,
A E Michel, and
L J Garey
January 1969,
Experimental brain research,
A E Michel, and
L J Garey
August 1973,
Experimental neurology,
A E Michel, and
L J Garey
August 2014,
Neuroscience,
