Subatrial papillary muscle
Musculus papillaris subatrialis
- Latin synonym: Musculus papillaris posterior ventriculi sinistri
- Synonym: Posterior papillary muscle of left ventricle; Dorsal papillary muscle
Definition
The subatrial papillary muscle (also identified as "posterior papillary muscle" by human nomenclature) arise near the caudal mural aspect of LV and lies near the subsinuosal interventricular groove. The subatrial papillary muscle (musculus papillaris subatrialis) is closer to the paraconal interventricular groove that the subauricular papillary muscle.
The two large papillary muscles (musculi papillares) of the left ventricle are thick, smooth rolls of myocardium, coming from the LV outer wall which have compound apices and give rise to the stout chordae tendineae of this chamber.The subatrial papillary muscle (musculus papillaris subatrialis) is closer to the paraconal interventricular groove than the subauricular papillary muscle (musculus papillaris subauricularis).
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