Dendritic Spines and Development: Towards a Unifying Model of Spinogenesis—A Present Day Review of Cajal's Histological Slides and Drawings

Figure 18

(a) Depicts three-dimensional reconstructions, granule cell, olfactory bulb, one-month-old dog, Cajal histological preparation, Golgi-method. (b) Filopodia, protospines and spines; 1–10: inner dendrites (above the soma); 11–15: peripheral dendrites (below the soma); 16–20: peripheral apical tuft. (c) Filopodia, protospines and spines of the peripheral apical tuft. Filopodia and protospines are color coded in green. The arrow in (b) 18 points to a very big head with long neck possibly a gemmule, a characteristic appendage of this type of cell.