Cartilage - Weeblyjumed16.weebly.com/uploads/8/8/5/1/88514776/cartilage... · 2019. 10. 1. ·...
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CartilagePractical part
Dr. Heba KalbounehAssistant Professor of Anatomy and Histology
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▪ Cartilage is AVASCULAR and is
nourished by the diffusion of
nutrients from capillaries in
adjacent connective tissue
(perichondrium) or by synovial
fluid from joint cavities.
▪ As might be expected of cells
in an avascular tissue,
chondrocytes exhibit low
metabolic activity.
▪ Cartilage has no lymphatic
vessels or nerves.
Isogenous group
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• Matrix around the cells is brighter and deep in color than other areas, this matrix is known territorial matrix
• Territorial matrix is rich in GAG and poor in collagen.
• Two groups of cells are separated by a lightly colored matrix known inter-territorial matrix
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Perichondrium
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Locations of the different kinds of cartilage
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HyalineCartilage
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Trachea
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Epiphyseal plate: it is responsible for the longitudinal
growth of bone .
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Elastic Cartilage
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ELASTIC CARTILAGE
24
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Fibrocartilage
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Tendon
Bone
Fibrocartilage found where tendon connects to bone
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Hyalinecartilage
Elastic cartilage
Fibrocartilage
Main features of the extracellular matrix
Homogeneous, with type II collagen
Type II collagen and darker elastic fibers
Type I collagen with type II collagen
Major cells Chondrocytes, chondroblasts
Chondrocytes, chondroblasts
Chondrocytes, fibroblasts
Presence of perichondrium
Yes (except at articularcartilage)
Yes No
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Hyalinecartilage
Elastic cartilage Fibrocartilage
Main locations /examples
Many components of upper respiratory tract; articular ends & epiphyseal plates of long bones; fetal skeleton
External ear,external acoustic meatus, auditory tube; epiglottis and certain other laryngeal cartilages
Intervertebraldiscs, pubic symphysis, meniscus, and certain other joints; insertions of tendons
Main functions Provides smooth, low-friction surfaces in joints; structural support for respiratory tract
Provides flexible shape and support of soft tissues
Provides cushioning, tensile strength and resistance to tearing and compression
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Identify
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Key1. Elastic cartilage 2. lacuna3. Densely packed elastic fibers
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Identify
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1. Chondrocytes2. Collagen fibers (type 1)
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Name the two types of matrix and what
is the difference between them?
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Identify