(a) A cell similar to a myofibroblast present in human dura mater. (b) Macrophage located among nerve roots in the cauda equina. Transmission electron microscopy, magnification: ×15,000 (a); ×8,000 (b)

(a) View of the cytoplasm of a macrophage located within the pia mater from a nerve root from the cauda equina. Transmission electron microscopy. (b) Macrophage cell present in a nerve root from the cauda equina. Electron microscopy (From Reina et al. [8]; with permission) Magnification: ×10,000 (a); ×20,000 (b)

Macrophage in a nerve root from the cauda equina. (a) Cytoplasmic pseudopodia are identified. (b) The same image at higher magnification. Transmission electron microscopy, magnification: ×4,400 (a); ×12,000 (b)

Macrophage in a nerve root from the cauda equina. (a) Detail of lysosomes, smooth endoplasmic reticulum, and mitochondria. (b) Two pseudopods during phagocytosis of a cell particle (From Reina et al. [8]; with permission) Transmission electron microscopy, magnification: ×20,000 (a); ×50,000 (b)

Macrophage. (a) Detail of a macrophage in a nerve root from the cauda equina. Lysosomes are identified. (b) Macrophage located inside a human spinal subdural compartment. Transmission electron microscopy, magnification: ×12,000 (a); ×7,000 (b)

Free cell filled with numerous lysosomes, located inside the human spinal subdural compartment. Transmission electron microscopy, magnification: ×7,000

Macrophage located between dural laminas from human spinal dura mater. (a) Several elongated pseudopods lacking organelles. (b) Two adjacent cells in close contact. Above, a macrophage shows pseudopods. Transmission electron microscopy, magnification: ×12,000 (a); ×10,000 (b)