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 19:01:04Avatar 3 centers on the Sully family, showcasing the internal rift caused by the sacrifice of their eldest son, and their alliance with other tribes on Pandora against the external conflict of the Ashbringers, who adhere to the philosophy of fire and are allied with humans. It explores the grand themes of family, faith, and survival.
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Avatar 3 centers on the Sully family, showcasing the internal rift caused by the sacrifice of their eldest son, and their alliance with other tribes on Pandora against the external conflict of the Ashbringers, who adhere to the philosophy of fire and are allied with humans. It explores the grand themes of family, faith, and survival.
This article discusses the Easter eggs and homages in Zootopia 2 that you may have discovered. The main content includes: character and archetype Easter eggs, cinematic universe crossover Easter eggs, animal ecology and behavior references, symbol and metaphor Easter eggs, social satire and brand allusions, and emotional storylines and sequel foreshadowing.
[Zootopia Character Relationship Chart] The idealistic rabbit police officer Judy and the cynical fox conman Nick form a charmingly contrasting duo, rising from street hustlers to become Zootopia police officers!
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