The medial papillary complex

Area of Science:

• Cardiovascular Anatomy
• Embryology
• Morphology

Background:

• The papillary muscle of the conus, also known as Lancisi's muscle, is a structure within the right ventricle.
• Its anatomical variations and developmental origins are not fully understood.

Purpose of the Study:

• To investigate the detailed anatomy and morphological variations of the papillary muscle of the conus.
• To propose a new nomenclature reflecting observed variations.
• To assess its utility as an anatomical landmark in the right ventricle.

Main Methods:

• Examination of 100 normal adult hearts from pathological collections.
• Analysis of 8 embryonic and fetal hearts.
• Detailed morphological description and developmental assessment.

Main Results:

• Significant morphological variations were observed in Lancisi's muscle.
• The term "medial papillary complex" is proposed to encompass these variations.
• The developmental trajectory of this complex was described.

Conclusions:

• The medial papillary complex exhibits wide anatomical variability.
• Its value as a consistent anatomical landmark in the right ventricle is limited.
• Understanding its development is crucial for interpreting its morphology.