--subdivision Innervation under individual organs and regions of the body, e.g. Heart--Innervation; Foot--Innervation; and subdivision Nervous system under individual animals and groups of animals, e.g. Fishes--Nervous system
General works on the microscopic anatomy of animal tissues are entered under the heading Histology. Studies of particular tissues or organs are entered under the name of the tissue or organ, e.g. Bone, Cartilage, Kidneys, Pancreas.