The Pyramidalis Muscle | Origin, Insertion, Innervation, Action, & Variation

The video tutorial discusses the anterior abdominal wall muscles, focusing on the pyramidalis muscle. It covers the identification, function, innervation, and blood supply of the pyramidalis, highlighting its variability among individuals. The pyramidalis is a small, pyramid-shaped muscle that tenses the linea alba and is innervated by the subcostal nerve. It is present in 80% of the population, with variability in presence, size, and number. The tutorial explains how the rectus abdominis compensates for the absence of the pyramidalis.

What are the main muscles of the anterior abdominal wall mentioned in the text?

What is the primary action of the pyramidalis muscle?

What is the blood supply to the pyramidalis muscle?

Describe the variability of the pyramidalis muscle in the human population.

Explain how the absence of the pyramidalis muscle affects the rectus abdominis.