Studies on the Structure and Physiology of the Flight Muscles of Birds. 4. Observations on the Fiber Architecture of the Pectoralis Major Muscle of the Pigeon

The relative distribution pattern of the red and white muscle fibers in the breast muscle of the pigeon is studied.2. There exists a direct relation between the distribution of metabolites and that of the two types of fibers in the different regions of the muscle.3. Quantitative estimation of glycogen in the two types of fibers confirms the higher concentration of glycogen in the white fibers.