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Sexual differences in the numerical density of synaptic profiles of developing rat visual cortex

✍ Scribed by Muñoz-Cueto, José Antonia ;Ruiz-Marcos, Antonio

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
995 KB
Volume
25
Category
Article
ISSN
0022-3034

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✦ Synopsis

Axo-dendritic synaptic profiles were quantified along the whole depth of the visual cortex of 10-day-old male and female rats. In both sexes the numerical density of synaptic profiles on spine-like structures was greater than the numerical density of synapses on dendritic shafts. Females had a significantly greater numerical density of synaptic profiles on spine-like structures, than did males at a distance of 200-400 and 500-600 wm from the pia surface, which corresponds to layers 11-111 and IV of the cortex, respectively. A small percentage (2%-4%) of spine-like structures received two presynaptic terminals. This type of double synapses was three times more abundant in females. No sex differences were found in the numerical density of synapses on dendritic shafts in any Cortical layer.

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