Light microscopy: flat, multi-cylindrical, weakly basophilic cytoplasm, large nuclei, light coloration, and obvious nucleoli

Electron microscopy: Abundant rough endoplasmic reticulum RER and well-developed Golgi complex Gc

Function: Secrete fibers and matrix

Shape: Many irregular shapes

Light microscope: irregular, pseudopodia; small nucleus, dark color: eosinophilic, may contain foreign particles and vacuoles.

Electron microscope: a large number of lysosomes, phagosomes, phagophore, microtubules, microfilaments, and pseudopods.

Source: Monocytes

Widely distributed, located in LCT

Function: Phagocytosis, antigen presentation, secretion

Light microscopy: round/oval, basophilic cytoplasm, light staining area next to the nucleus, nuclear deviation, and nuclear chromatin in a radial shape (carriage shape)

Electron microscope: rough endoplasmic reticulum RER, free ribosomes, centrosomes, Golgi complex

Source: B lymphocytes

Function: Synthesize and secrete immunoglobulins (antibodies) and participate in humoral immunity

Light microscope: round/oval; thick, uniform metachromatic granules.

Electron microscopy: membrane-coated particles

Distribution: Widely distributed along small blood vessels

Function

Intragranular: heparin, histamine, eosinophilic chemoattractant Intracytoplasm: leukotrienes

Light microscope: The body is large, round or polygonal; the nucleus is oblate and tilted to one side; the cytoplasm contains a large lipid droplet.

Function: synthesize and store fat; participate in lipid (energy) metabolism

stem cells

Distribution: around small blood vessels

Shape: Fibrocyte-like, small, spindle-shaped

Function: It has multi-directional differentiation potential and can proliferate and differentiate into fibroblasts, endothelial cells, smooth muscle cells, etc.

Source: blood, including neutrophils, eosinophils, lymphocytes, etc.

Function: immune defense

collagen fibers

spandex

mesh fiber

Amorphous gel composed of biological macromolecules

composition

tissue fluid

Collagen fibers are arranged parallel to the direction of stress

tendon, aponeurosis