May- Cartilage Flashcards
what kind of cells are cartilage?
chondrablasts
what are the types of fibers that make up cartilage?
collagen or elastic
what is chondromucoprotein and what is it made of?
ground substance. made up of chondrotin sulfate and keratan sulfate.
what types of cartilage are derived from mesenchymal cells?
hyaline and elastic
what type of cartilage is developed from dense connective tissue?
fibrocartilage
what differentiates to form the perichondrium?
mesenchymal cells
what is the outer layer of the perichondrium referred to as?
the fibrous layer
what is the inner layer of the perichondrium referred to as?
chondrogenic layer
what cells are found in the fibrous layer?
collagen type I
fibroblasts
mesenchymal cells
where are chondroblasts typically located in the perichondrium and what is unique about them?
the chondrogenic layer (inner layer). they undergo mitosis here and are entrapped in lacunae
what type of growth exemplifies growing in width?
appositional growth
young cartilage grows via the mitotic activity of cell nests, what type of growth is this referred to as?
interstitial growth
how is interstitial growth accomplished?
after the cell nest divides, the cells secrete matrix into their own lacunae and new cartilage is added with in existing cartilage
how does cartilage meet is nutrition needs?
via an avascular process. nutrients diffuse through the matrix from blood vessels outside the perichondrium
what leads to calcification (death) of the cartilage?
when blood invades the cartilage
what type of cartilage is replaced by bone in the fetus and young adult?
hyaline cartilage
what is the hyaline matrix made up of?
firm gel of fibrous and amorphous material
what type of collagen does hyaline cartilage consist of?
collagen type II
name the examples of uncalcified hyaline cartilage?
articular surface of bone, nose, bronchus, trachea, larynx
what types of cartilage contain perichondrium?
hyaline and elastic cartilage
what are some examples of elastic cartilage?
pinna (external ear) and epiglottis
what type of cartilage lacks a perichondrium?
firbrocartilage
do fribrocartilage contain more lacunae per unit area?
nope (they contain fewer)
name some examples of fibrocartilage.
tendon insertions, pubic symphysis and intervetebral discs.
