Fibrocytes—Fibroblasts , Purkinje Cells—Cerebellar Cortex, Vegetative Ganglion Cell
In connective tissue sections, the nonmotile (fixed) fibrocytes look like thin,
spindle-shaped elements. However, their true shape can be brought out in
thin whole-mount preparations. Fibrocytes are sometimes rounded, sometimes
elongated, flattened cells with membranous or thorn-like processes 1 .
The cell processes often touch each other and form aweb. Their large, mostly
oval nuclei feature a delicate chromatin structure (not visible in this preparation).
Here, the nuclei appear homogeneous.
Fibroblasts biosynthesize all components of the fibers and the extracellular
matrix (ground substances). Fibrocytes are fibroblasts that showmuch lower
rates of biosynthetic activity.
1 Fibrocytes with cytoplasmic processes
2 Nuclei from free connective tissue cells
Purkinje Cells—Cerebellar Cortex
Pear-shaped Purkinje cells, which are about 50–70μm high and 30–35μm
wide (cell soma, perikaryon) 2 , send out 2–3μm thick dendrites that branch
out like trellis trees. These delicate trees reach up to the cortical surface, extending
their fine branches espalier-like in only one plane. The axon (efference)
1 spans the distance between the basal axon hillock and the cerebellar
cortex. The elaborate branching can only be seen using metal impregnation
Oocyte from a sea urchin ovary. Large, heavily stained nucleolus 2 inside a
loosely structured nucleus 1 . The finely granulated cytoplasm contains yolk
materials. Cell organelles are not visible
Vegetative Ganglion Cell
Large vegetative ganglion cell from the Auerbach plexus (plexus myentericus)
from cat duodenum. A collateral branches from the upward extending axon.
The downward-pointing cell processes are dendrites. Note the large nucleus