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. Author manuscript; available in PMC: 2022 May 1.
Published in final edited form as: Cell Tissue Res. 2021 Jan 26;384(2):367–387. doi: 10.1007/s00441-020-03379-3

Fig. 2. Histological analysis of PAT by H&E staining of cross and longitudinal tissue sections.

Fig. 2

The results show that the PAT at least has three different components: paratenon, IFM, and fascicles. The tendon surface is covered by the paratenon (black arrows in a, d), with the loose net-mesh of the IFM between the collagen fiber bundles (red arrows in a-f). The core tendon structure is formed by high-density collagen fiber bundles (blue arrows in a-f). Some blood vessel-like tissues extend from the paratenon (green arrows in a, d) to the IFM (green arrows in b, c). The cells in the collagen fibers are elongated in shape (yellow arrows in f), however, the cells in IFM exhibit a round shape (white arrows in f). Images a, b, d, and e represent separate tissue sections. Image c is the enlarged image of b, with a correlating blue box. Image f is the enlarged image of the black box in image e. Black bars: 200 μm; Blue bars: 50 μm.