Tendo calcaneus (tendon of Achilles)
longitudinal section
Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed
Human, 10% formalin, H. & E., 162 x.
Tendons may be confused with striated muscle sections. This confusion can be avoided by examining the tissue at higher magnifications, where the presence or absence of cross striations will be diagnostic.
Collagen: Fibers oriented in one direction and in dense aggregates and bundles separated by a small amount of areolar connective tissue containing vessels and nerves. Collagen fibrils are flexible, have high tensile strength, and are inelastic. This large tendon links the gastrocnemius and soleus muscles with the calcaneus bone at the rear of the foot.
Fibrocyte nuclei: The predominant cell in this type of connective tissue (dense collagenous type) is oriented primarily in the longitudinal axis, in rows between the bundles of collagenous fibers.
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