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Heart - histology

This is a histology slide of the hart. It is a high magnification micrograph of sinoatrial (SA) node tissue. H&E stain.

The SA node fibre vaguely resemble cardiac myocytes; however, they are thinner, squiggly and stain less intensely (on H&E) than cardiac myocytes. Adjacent to nodal tissue is nerve fibre. The SA node interacts with fibres from the vagus nerve.

Histology image and description courtesy of Wikimedia Commons and user nephron.

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