morphology
Meaning of morphology: Shape treated as evidence: what a cell, an organ or a whole organism looks like, before asking what it does or is made of.
Definition of morphology
Morphology is the study of the form and structure of living things, and by extension the form and structure themselves. It covers everything visible about shape, size, outline and arrangement, from the build of a whole organism down to the profile of a single cell under the microscope. It deliberately sets aside function and chemistry, which are studied separately.
Why does shape carry information?
Because form follows from the processes that produced it, and a disturbed process leaves a visible mark. A red cell shaped like a target rather than a disc has an altered membrane. A sperm with two tails did not divide correctly. A bacterial colony that spreads and swarms across a plate is moving in a way its neighbors cannot. None of these observations explains itself, but each narrows the field enough to point at the next test. That is why description of form survives as a working tool even where genetic and chemical methods are available: it is fast, needs no reagent, and often comes first.
Where does the word appear in medicine?
| Setting | What is being described |
|---|---|
| Blood film | Size, shape and color of red cells and the look of white cells |
| Fertility testing | Proportion of sperm with a normally shaped head and tail |
| Microbiology | Shape of bacteria and the appearance of colonies |
| Cell pathology | Nuclear outline, size and regularity in a tumor |
How does it differ from anatomy and physiology?
Anatomy describes the structure of one species, usually the human body, and where each part sits. Physiology asks how those parts work. Morphology is the wider comparative discipline that treats form itself as the subject, across species and across scales, from the skeleton of an animal down to the shape of a chromosome. The distinction matters in clinical genetics, where an unusual pattern of facial features, hands or growth can point toward a hereditary condition before any laboratory result is available. Features of that kind are recorded as morphological findings and matched against described patterns.
Also known as
Used in a sentence
The blood film showed red cells of normal morphology.
Good to know
Morphology describes appearance and does not by itself establish a cause, so an abnormality of form recorded on a blood film or a cell sample is treated as a lead requiring confirmation rather than a diagnosis.
Word origin
Where “morphology” comes from
From the Greek morphe, meaning form or shape, and logos, meaning study or account.