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The papillary muscles of the left ventricle and the cardiac segments
L J DiDio1, H Rodrigues, C A Baptista
1Department of Anatomy, Medical College of Ohio, Toledo 43699-0008.
Insights
The study maps arterial segments supplying left ventricle papillary muscles. Findings reveal complex vascularization, suggesting anatomical variations influence ischemic heart disease impacts.
Area of Science:
- Cardiovascular Anatomy
- Surgical Anatomy
- Cardiac Physiology
Background:
- Papillary muscles are crucial for left ventricle function.
- Understanding their arterial supply is vital for treating myocardial ischemia.
Purpose of the Study:
- To investigate the relationship between arterial supply and papillary muscles in the human left ventricle.
- To identify specific arterial segments supplying anterior and posterior papillary muscles.
Main Methods:
- Analysis of 38 adult human hearts using vinyl acetate injection and corrosion casting.
- Formaldehyde fixation was used for 10 hearts.
- Papillary muscle positions were marked, and arterial supply patterns were documented.
Main Results:
- The anterior papillary muscle receives arterial supply from anterior interventricular, lateral, and left marginal segments.
- The posterior papillary muscle is supplied by anterior interventricular, left marginal, posterior interventricular, and posterior ventricular segments.
- Papillary muscles typically receive blood from multiple segmental arteries.
Conclusions:
- Papillary muscles exhibit complex arterial supply patterns from various ventricular segments.
- Anatomical variations in this vascularization can significantly impact the functional consequences of myocardial ischemic lesions.
Abstract:
The relationship between the arterial anatomicosurgical segments and the papillary muscles of the left ventricle was investigated in 38 human hearts of adult individuals of both sexes. The specimens were studied after (a) vinyl acetate injection and corrosion (28 hearts) or (b) formaldehyde fixation (10 hearts). In 4 of the corrosion casts, the cardiac chambers were not filled with the plastic substance and, prior to corrosion, the position of the papillary muscles was marked with threads or pins. The anterior papillary muscle was related to the (a) anterior interventricular segment (I SV); (b) lateral (II SV); and (c) left marginal segment (III SV). The medical portion of the anterior papillary muscle is supplied by the artery of the I SV whereas the lateral portion is supplied by the artery of the II or III SV. The posterior papillary muscle was related to the (a) anterior interventricular segment (I SV); (b) left marginal (III SV); (c) posterior interventricular segment (III DV) and (d) posterior ventricular (IV SV). As a rule, the papillary muscles are supplied by more than one segmental artery, therefore, anatomical variations may play an important role in functional alterations produced by ischemic lesions of the myocardium.