File:Hyaline cartilage 04.jpg: Difference between revisions

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Respiratory Trachea - Layers

Mucosa - formed by epithelium and underlying lamina propria.

respiratory epithelium - (pseudostratified columnar and ciliated) ciliated cells, goblet cells, brush cells, endocrine cells, surfactant-producing cells (Clara cells), serous cells, basal cells, basement membrane.
lamina propria - loose connective tissue, many elastic fibres
elastic lamina - forming the border between the mucosa and submucosa is not visible in H&E stained slides.

Submucosa - connective tissue and submucosal glands

submucosal gland - serous (dark) and mucous (light) parts have different staining appearance.

Tracheal Cartilage

tracheal cartilage - hyaline cartilage, 16 to 20 C-shaped cartilages.
perichondrium - surface of cartilage.
trachealis muscle - (smooth muscle) Not visible in this section, together with connective tissue fibres, join ends of the cartilages together.

Hyaline Cartilage Development

forms from mesenchymal cells.
precursor cells become rounded and form densely packed cellular masses, chondrification centres.
chondroblasts - (cartilage-forming cells) begin secreting the extracellular matrix components of cartilage.
- extracellular matrix - ground substance (hyaluronan, chondroitin sulfates and keratan sulfate) and tropocollagen (polymerises into fine collagen fibres, not visible).

Growth

appositional growth - mesenchymal cells surrounding the cartilage in the deep part of the perichondrium (or the chondrogenic layer) differentiate into chondroblasts. Appositional growth occurs also in mature cartilage.
Interstitial growth - small groups of chondroblasts (isogenous groups) in existing cartilage, can divide and become separated from each other by a thin partition of matrix. Interstitial growth occurs mainly in immature cartilage.

Links: Histology | Histology Stains | Blue Histology images copyright Lutz Slomianka 1998-2009. The literary and artistic works on the original Blue Histology website may be reproduced, adapted, published and distributed for non-commercial purposes. See also the page Histology Stains.

Cite this page: Hill, M.A. (2024, May 3) Embryology Hyaline cartilage 04.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hyaline_cartilage_04.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	23:24, 18 February 2013		500 × 626 (101 KB)	Z8600021 (talk \| contribs)	==Trachea Hyaline Cartilage== {{Cartilage Histology}} {{Blue Histology}}

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 ** extracellular matrix - ground substance (hyaluronan, chondroitin sulfates and keratan sulfate) and tropocollagen (polymerises into fine collagen fibres, not visible).
-* Interstitial growth isogenous groups - small groups of chondroblasts in existing cartilage, can divide and become separated from each other by a thin partition of matrix.
+====Growth====
+* '''appositional growth''' - mesenchymal cells surrounding the cartilage in the deep part of the perichondrium (or the chondrogenic layer) differentiate into chondroblasts. Appositional growth occurs also in mature cartilage.
-Interstitial growth occurs mainly in immature cartilage.
+* '''Interstitial growth''' - small groups of chondroblasts (isogenous groups) in existing cartilage, can divide and become separated from each other by a thin partition of matrix. Interstitial growth occurs mainly in immature cartilage.
 {{Trachea histology links}}