MindMap Gallery epithelial tissue
This is a mind map about epithelial tissue, an important structure composed mainly of densely packed epithelial cells and a small amount of intercellular stroma.
Edited at 2024-04-08 19:01:04This infographic, created using EdrawMax, outlines the pivotal moments in African American history from 1619 to the present. It highlights significant events such as emancipation, key civil rights legislation, and notable achievements that have shaped the social and political landscape. The timeline serves as a visual representation of the struggle for equality and justice, emphasizing the resilience and contributions of African Americans throughout history.
This infographic, designed with EdrawMax, presents a detailed timeline of the evolution of voting rights and citizenship in the U.S. from 1870 to the present. It highlights key legislative milestones, court decisions, and societal changes that have expanded or challenged voting access. The timeline underscores the ongoing struggle for equality and the continuous efforts to secure voting rights for all citizens, reflecting the dynamic nature of democracy in America.
This infographic, created using EdrawMax, highlights the rich cultural heritage and outstanding contributions of African Americans. It covers key areas such as STEM innovations, literature and thought, global influence of music and arts, and historical preservation. The document showcases influential figures and institutions that have played pivotal roles in shaping science, medicine, literature, and public memory, underscoring the integral role of African American contributions to society.
This infographic, created using EdrawMax, outlines the pivotal moments in African American history from 1619 to the present. It highlights significant events such as emancipation, key civil rights legislation, and notable achievements that have shaped the social and political landscape. The timeline serves as a visual representation of the struggle for equality and justice, emphasizing the resilience and contributions of African Americans throughout history.
This infographic, designed with EdrawMax, presents a detailed timeline of the evolution of voting rights and citizenship in the U.S. from 1870 to the present. It highlights key legislative milestones, court decisions, and societal changes that have expanded or challenged voting access. The timeline underscores the ongoing struggle for equality and the continuous efforts to secure voting rights for all citizens, reflecting the dynamic nature of democracy in America.
This infographic, created using EdrawMax, highlights the rich cultural heritage and outstanding contributions of African Americans. It covers key areas such as STEM innovations, literature and thought, global influence of music and arts, and historical preservation. The document showcases influential figures and institutions that have played pivotal roles in shaping science, medicine, literature, and public memory, underscoring the integral role of African American contributions to society.
epithelial tissue
Features
densely packed epithelial cells
Very small amounts of extracellular matrix
constitute
Obvious polarity: towards the free surface or basal surface
Most epithelia are avascular
Contains rich sensory nerve endings
Covering epithelium
single layer squamous epithelium
Surface: Cells are irregular polygonal and nuclei are flat oval.
Section: The cells are flat and thin, with little cytoplasm and only the nuclear part is thicker.
Distribution: cardiovascular lymphatic lumen surface, pleural peritoneal pericardial surface, alveolar epithelium, renal cyst wall layer
Function: Conducive to the flow of fluids and material exchange and the activities of organs
single layer cuboidal epithelium
Surface: Cells are hexagonal or polygonal
Section: The cells are cube-shaped with the nucleus in the center.
Distribution: Renal tubules, renal collecting tubules, thyroid follicles, retinal pigment epithelium
Function: secretion and absorption
simple columnar epithelium
Surface: Cells are hexagonal or polygonal
Section: The cells are columnar and the nuclei are oblong and mostly located at the base.
Distribution: gastrointestinal gall bladder, uterus, fallopian tube lumen
Function: Absorption and secretion
pseudostratified ciliated columnar epithelium
section
Cell morphology is different and uneven, and the position of the nucleus varies.
Looks like stratification but the basal surface of all cells is attached to the basement membrane
Composition: columnar, spindle, cone, goblet cells
Distribution: cavity surface of respiratory tract
Function: Secretion, protection and self-cleansing
Stratified squamous epithelium
section
A layer of basal cells close to the basement membrane is short and columnar.
More immature stem cells can proliferate, differentiate and migrate to shallower layers
Above the basal layer, that is, in the middle layer, there are several layers of polygonal cells.
The uppermost layer consists of several layers of spindle or flat cells.
Distribution: Keratinized: oral cavity, esophagus, vaginal surface, non-keratinized: surface of skin
Function: Friction resistance, prevention of foreign matter intrusion, regeneration and repair
Stratified columnar epithelium
Section: The deep layer is composed of several layers of polygonal cells, and the superficial layer is a layer of neatly arranged short columnar cells.
Distribution: Eyelid conjunctiva, male urethra, large ducts of some glands
metastatic epithelium
section
The superficial cap cells are larger and cover the deeper layers
The cells in the middle layer are polygonal
Basal layer cells are cuboidal or short columnar
Distribution: renal calyces, renal pelvis, ureters (urethra tube), bladder surface
Function: Prevent urine erosion
specialized structure
free surface
microvilli
Small finger-like protrusions extending outward from the cell membrane along with the cytoplasm
Expanding the free surface area of cells facilitates cell absorption or secretion
cilia
Thick and long protrusions extending outward from the free surface of epithelial cells together with the membrane
9 2 Microtubules enable cilia to swing in a rhythmic and directional manner
side
Tight junctions/zonules of atresia: barrier function to prevent macromolecules from entering the intercellular space
Intermediate link/adhesive zonule: adhesion function to maintain cell shape and transmit cell contractility
Desmosomes: a very strong continuous pattern
Gap links: conduits that form direct communication between cells
When two or more exist in close proximity, it is called a junctional complex
basal surface
Basement membrane: a film-like structure formed between the basal surface of epithelial cells and deep connective tissue
Plasma membrane infolding: the membrane on the basal surface of the epithelial cell folds inward toward the cytoplasm.
Hemidesmosomes: The connection between the basal surface of epithelial tissue and the basement membrane, fixing epithelial cells to the membrane