Here are entered works on the principles of structure in the animal kingdom. General comparative works on animal anatomy and morphology are entered under Anatomy, Comparative. --subdivision Morphology under individual animals and groups of animals, e.g. Fishes--Morphology; and subdivision Spermatozoa--Morphology under individual animals and groups of animals, e.g. Cattle--Spermatozoa--Morphology; Fishes--Spermatozoa--Morphology
--subdivision Phylogeny under individual animals and groups of animals and individual organs and regions of the body, e.g. Fishes--Phylogeny; Heart--Phylogeny
--subdivision Physiological aspects under activities and mental conditions for works on the relationship between an individual's activity or mental state and his physiology, e.g. Soccer--Physiological aspects; Mental illness--Physiological aspects; also subdivision Physiological effect under individual chemicals and groups of chemicals, individual materials and types of materials, individual plants and groups of plants, and under environmental phenomena or conditions for works on their effect on the functions of living organisms, e.g. Copper--Physiological effect; Heat--Physiological effect; also subdivision Physiology under individual animals and groups of animals, organs and regions of the body, classes of persons, and ethnic groups, e.g. Fishes--Physiology; Heart--Physiology; and subdivisions Embryos--Physiology and Larvae--Physiology under individual animals and groups of animals, e.g. Cattle--Embryos--Physiology; Fishes--Larvae--Physiology
