Upload
brede
View
28
Download
0
Embed Size (px)
DESCRIPTION
Where do you find CT?. What are the fibers in CT? What cells hang out in CT?. Connective Tissue. Holding it all together! . Connective tissue is found everywhere! . Main types: 1. Connective tissue proper – We will focus on this one most of next week! 2. Cartilage 3. Bone 4. Blood . - PowerPoint PPT Presentation
Citation preview
Where do you find CT?
What are the fibers in CT?
What cells hang out in CT?
Connective Tissue
Holding it all together!
Connective tissue is found everywhere! Main types:1. Connective tissue proper –
We will focus on this one most of next week!2. Cartilage3. Bone4. Blood
Properties
1. common origin Mesenchyme Mesenchyme is an embryonic tissueFrom the mesoderm
EctodermEndoderm
2. degrees of vascularity3. great degree of “non-living” extracellular
matrix What do we mean non-living?
Connective Tissue – essential functions
1. Binds structures 2. Provides support and protection 3. Insulation4. Transportation5. Energy storage
Structural elements:
1. Ground substance (matrix) 2. Fibers3. Cells
Wide range of varying tissue!Different structuresdifferent functions!
Ground Substance (matrix) Unstructured material Fills spaces/contains fibersComposed of:
1. interstitial fluid2. cell adhesion proteins glue like function3. Proteoglycansprotein core (point of
attachment) “GAGs” glycosaminoglycans 1. (interlock trapping water)
Major Cell Types: Blasts vs. Cytes
Fibroblasts- cells that produce fibers by secreting proteins into the matrix of CT tissue
Macrophages- originate as WBCs specialized cell phagocytosis
Mast Cells- release heparin prevents blood clotting, release histaminepromotes reactions associated with inflammation and allergies.
Fibroblast—laying matrix
CONNECTIVE TISSUE-3 FIBER TYPESA. Collagenous fibers- Thick threads of
protein (collagen) Grouped in long parallel bundles, they are
flexible, but only slightly elastic.
Great tensile strength (ligaments and tendons)
B. Elastic fibers-Composed of protein elastinThese fibers branch, forming complex
networks.weaker than collagenous fiber
however they stretch and can return back to there shape
Elastic Fibers
C. Reticular Fibers Very thin collagenous fibers Highly branched, form supporting
networks (LIKE A NET)
Reticular Fibers
When it comes to CT you can have a variety of types….Loose CT
1. areolar tissue2. Reticular tissue 3. Adipose tissue
DenseRegular Irregular Cartilage types
I.
Loose Connective Tissue Forms delicate thin membranes
throughout the bodyMain cellFibroblasts separated by a gel-
like matrix Binds skin to underlying organs and fills
spaces between musclesLies beneath epithelium
2
Adipose TissueFAT, develop when certain cells
store fat in droplets within their cytoplasm.
Beneath the skin, stored in many other locations as well.
Cushions, insulates, stores energy.
3
Dense Connective Tissueregular or irregular
Closely packed, thick, collagenous fibers and a close network of elastic fibers. Relatively few cellsmost of which are fibroblasts.
VERY STRONG TISSUE
4
Cartilage Rigid CTprovides support, frameworks, and
attachments, protects underlying tissueforms structural models for developing bone.
Cartilage matrixabundant, largely composed of colagenous fibers embedded in a gel-like ground substance .
Cartilagea special case
SPECIAL CARTILAGE CELLSCHONDROCYTES, occupy small
chambers called lacunae
Cartilage structures are enclosed in a covering of CTperichondrium (contains the blood vessels that deliver nutrients)
THE INTERCELLULAR MATRIX DISTINGUISHES THE TYPE OF CARTILAGE!
Hyaline Cartilage
*most common type *very fine collagenous fibers (looks like white glass)
Location: end of bones, joints, soft part of nose, trachea
Elastic Cartilage
Dense network of elastic fibers Much more flexible than hyaline cartilage
Location: framework of ear, parts of larynx
Fibrocartilage
Tough tissue, contains many collagenous fibers
-shock absorber for structures subjected to pressure.
Location: vertebrae (discs), knees, pelvic girdle.