invagination
invagination — noun
1. the biological or physical process by which a layer of tissue, membrane, or othe
the biological or physical process by which a layer of tissue, membrane, or other surface folds inward, creating a pocket, pouch, or tube-like cavity inside the original structure.
During wound healing, the invagination of new skin cells helps form a protective layer over the injury.
invagination + of + [tissue]; biological process
The surgeon explained that invagination of the intestinal lining can sometimes happen after abdominal surgery.
medical context: invagination of [body part]
In the lab, Dr. Okonkwo observed the invagination of the cell membrane as the amoeba began to engulf its prey.
The video showed a time-lapse of the invagination of the neural plate during early brain formation in a chick embryo.
- infolding
less formal, used more in general descriptions than in technical biology writing
- evagination
the opposite process — a layer folding or bulging outward rather than inward
文法句型
invagination + of [body part/tissue]
invagination into [structure]
用法筆記
Often used in developmental biology and cell biology to describe the folding behaviour of cell layers or membranes. The verb form 'invaginate' describes the action.
2. a pocket-like structure that has formed by folding inward, or the condition of b
a pocket-like structure that has formed by folding inward, or the condition of being folded inward and enclosed within a surrounding layer.
Under the microscope, Nadia could see a small invagination on the surface of the cell filled with fluid.
countable: observing an invagination
The CT scan revealed an invagination in the patient's colon that required further examination.
Kofi noted that the invagination of the plant leaf created a tiny chamber where insects often laid their eggs.
The textbook diagram showed the neural tube forming from an invagination that deepens and eventually closes off.
- depression
more general anatomical term, less precise about the folding mechanism
- pocket
everyday word that describes the shape but not the folding origin
- protrusion
a structure that bulges outward instead of inward
文法句型
an invagination in [body part]
an invagination of [tissue]
用法筆記
This sense refers to the existing structure or condition after invagination has occurred, not the process itself. Contrast with sense 1, which focuses on the action.
3. a specific stage in early embryonic development, where part of the wall of a hol
a specific stage in early embryonic development, where part of the wall of a hollow ball of cells (the blastula) folds inward to form the next developmental stage (the gastrula), establishing the three main cell layers (germ layers) that will develop into different tissues and organs.
Keiko observed frog blastula invagination — a critical step toward a multicellular embryo.
Keiko + observed + frog blastula invagination; concrete observation
During her PhD research, Sofia studied how invagination is controlled by the expression of specific genes in frog embryos.
Dr. Oluwaseun explained that invagination of the blastula wall begins the gastrula stage.
Minh's animation showed how invagination turns a hollow ball of cells into a layered embryo with a primitive gut.
- gastrulation
the broader process of which invagination is a key part; not exactly synonymous
文法句型
invagination during [stage]
invagination of the blastula
用法筆記
This sense is restricted to embryology. Do not confuse with the general biological sense (sense 1), which applies to any tissue or membrane folding. In embryology, invagination is a precisely defined morphogenetic movement.
4. a medical condition in which one segment of the intestine telescopes or slides f
a medical condition in which one segment of the intestine telescopes or slides forward into the section next to it, often causing pain, obstruction, or reduced blood flow.
The paediatrician diagnosed the two-year-old with intestinal invagination after he started vomiting and passing bloody stool.
medical context: diagnosed with invagination
An ultrasound can confirm an invagination of the bowel and help doctors decide whether treatment is needed urgently.
invagination of the bowel; diagnostic method
Dr. Chen explained that an invagination in adults is often linked to a growth inside the intestine wall.
Without treatment, an intestinal invagination can cut off the blood supply and lead to tissue damage within a few hours.
- intussusception
the standard medical term; more common in clinical settings than 'invagination'
文法句型
invagination of the [intestine/colon]
diagnosed with invagination
用法筆記
The more common medical term for this condition is 'intussusception'. 'Invagination' is sometimes used interchangeably in clinical writing, especially in pathology reports.