1.4.1.21.



Fig. 1.4.1.21. Mushroom-shaped dendritic spine making perforated synapse with axon terminal (at). A very narrow tubule (arrows) runs through the spine neck and connects the endoplasmic reticulum of the dendritic stem (D) with cisternae of the spine apparatus (sa). Scale = 400 nm. (Mouse, neocortex.) Download the high resolution image.