Cardiac muscle (heart muscle) is involuntary striated muscle that is found in the walls and histological foundation of the heart, specifically the myocardium. Cardiac muscle is one of three major types of muscle, the others being skeletal and smooth muscle. These three types of muscle all form in the process of myogenesis. The cells that constitute cardiac muscle, called cardiomyocytes or myocardiocytes, contain only three nuclei. The myocardium is the muscle tissue of the heart, and forms a thick middle layer between the outer epicardium layer and the inner endocardium layer.
Riley Matthews is the main character and title character of Girl Meets World. She is the fourteen-year-old daughter of Cory and Topanga Matthews. Riley and August Matthews are Cory and Topanga's only children, of which Riley is the eldest.
Girl Meets World is an American coming of age television sitcom. The series made its debut on June 27, 2014 on Disney Channel following the premiere of the Disney Channel Original Movie, Zapped, before assuming its normal 8:30â9:00 p.m. ET/PT time slot on Fridays, beginning July 11, 2014.