Assertion: cardiac muscle's cell | /r/CapableOf | extend into the av bundle of his
Facets:
value: from the av node
type: LOCATION
Source sentences:
text: Special cells extend from the AV node into the AV bundle of His, from which Purkinje fibers form two bundle branches—one in each subendocardial myocardium on both sides of the interventricular septum.