The sino-atrial (SA) node is composed of a small number of diffusely oriented cardiac fibers with few myofibrils and few nerve endings from the autonomic nervous system.
El nodo sinoauricular (SA) está compuesto por un pequeño número de fibras cardíacas difusamente orientadas con pocas miofibrillas y pocas terminaciones nerviosas del sistema nervioso autónomo.
| Front | composition of Sino-Atrial node |
|---|---|
| Back | a small number of diffusely oriented 'cardiac fibres' possessing few myofibrils and few 'nerve endings' from the autonomic nervous system |
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