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The development of the light microscope made possible the examination of some structural details of individual tissues and single cells; the development of the electron microscope and of methods for preparing ultrathin sections of tissues created an entirely new aspect of morphology—that involving the detailed structure of cells.

Electron microscopy has gradually revealed the amazing complexity of the many structures of the cells of plants and animals.

In marked contrast, functions but have quite different structural and developmental patterns.

The arm of a human, the wing of a bird, and the pectoral fins of a whale are homologous structures in that all have similar patterns of bones, muscles, nerves, and blood vessels and similar embryonic origins; each, however, has a different function.

Other physical techniques have permitted biologists to investigate the morphology of complex molecules such as hemoglobin, the gas-carrying protein of blood, and deoxyribonucleic acid (DNA), of which most genes are composed.

Thus, morphology encompasses the study of biological structures over a tremendous range of sizes, from the macroscopic to the molecular.

plants, and microorganisms and of the relationships of their constituent parts.

The existence of capillaries had been postulated 30 years earlier by English physician Antonie van Leeuwenhoek used the recently invented microscope to describe red blood cells, human sperm cells, bacteria, protozoans, and various other structures.His descriptions of the human body, though they remained the unquestioned authority for more than 1,000 years, contained some remarkable errors, for they were based on dissections of pigs and monkeys rather than of humans.Although it is difficult to pinpoint the emergence of modern morphology as a science, one of the early landmarks was the publication in 1543 of Andreas Vesalius, whose careful dissections of human bodies and accurate drawings of his observations revealed many of the inaccuracies in Galen’s earlier descriptions of the human body.During the early civilizations of China, Egypt, and the Middle East, as humans learned to domesticate certain animals and to cultivate many fruits and grains, they also acquired knowledge about the structures of various plants and animals.

contains excellent descriptions, clearly recognizable in extant species, of the animals of Greece and Asia Minor.As biologists have begun to devote more attention to ecology, the identification of plant and animal species present in an area and perhaps changing in numbers in response to environmental changes has become increasingly significant.



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