<Tr> <Th> TA </Th> <Td> A12. 1.06. 008 </Td> </Tr> <Tr> <Th> FMA </Th> <Td> 76538 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> The Purkinje fibres (/ pərˈkɪndʒiː / pər - KIN - jee) (Purkinje tissue or subendocardial branches) are located in the inner ventricular walls of the heart, just beneath the endocardium in a space called the subendocardium . The Purkinje fibres are specialised conducting fibres composed of electrically excitable cells that are larger than cardiomyocytes with fewer myofibrils and a large number of mitochondria and which (cells) conduct cardiac action potentials more quickly and efficiently than any other cells in the heart . Purkinje fibres allow the heart's conduction system to create synchronized contractions of its ventricles, and are, therefore, essential for maintaining a consistent heart rhythm . </P>

Where do the purkinje fibers branch first in the ventricular syncytium