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Anatomy Atlases: Atlas of Microscopic Anatomy: Section 1 - Cells Atlas of Microscopic Anatomy: Section 8 - Cardiovascular System

Plate 8.151 Purkinje Fibers

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger, Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed


PURKINJE FIBERS
Specialized cardiac muscle fibers

Plate 8.151 Purkinje Fibers

Bovine heart, 10% formalin, H. & E.; A. 96 x; B. 240 x.

 

In this plate, the continuation of the bundle of His*, composed of small unbranched cardiac fibers, is seen in the form of Purkinje* fibers. These large cardiac fibers ultimately join and regulate the contractile activity of ordinary cardiac muscle fibers.

The plate illustrates distinctive features of Purkinje fibers: (1) they are larger than ordinary cardiac fibers and bundle fibers; (2) they may be binucleate, have few myofibrils, and have a vacuous cytoplasm (normally filled with glycogen); and (3) they have a subendocardial location. Purkinje cells have been shown to be linked to bundle fibers and to ordinary cardiac fibers by gap junctions and desmosomes. Gap junctions have been shown to provide a point of electrical, but not protoplasmic, continuity between cardiac fibers and between smooth muscle fibers.

*His, Jr. was a nineteenth-century German physician and Purkinje was a nineteenth-century Bohemian anatomist.

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