Introduction > Locomotor apparatus > Passive locomotor apparatus, the skeletal system >; Skeleton of the trunk; Skeleton of the limbs; Skeleton of the head; Muscular system >; General considerations; Muscles of the head; Muscles of the trunk; Muscles of the limbs; Body cavities >; Digestive system >; General considerations; Alimentary tract of the head; Alimentary tract of the trunk; Respiratory system >; Urogenital system >; General considerations; Urinary organs; Sex organs; Development and function of the embryonic membranes; Circulatory system >; Blood-vascular system; Lymphatic system; Endocrine glands >; Nervous system >; Central nervous system; Peripheral nervous system; Sensory organs >; The skin >.