connective tissue - anatomy and...
TRANSCRIPT
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Connective Tissue:
• Most abundant tissue type in the body
• Supports epithelial tissues connects it to other tissues
• Provides coverings that support & protect
• Containing more extracellular matrix than cells
• Extracellular matrix: consists of fibers and ground
substance
– 3 types of fibers: collagen fibers, elastin fibers, reticular
fibers (produced by fibroblasts)
– Ground substance: fluid, semifluid, gelatinous, or hard
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Different Types of Mature CT:
Loose CT: extracellular fluid made by fibroblasts
Dense CT: extracellular fluid made by fibroblasts
Cartilage: extracellular fluid made by
chondroblasts and maintained by chondrocytes
Bone: extracellular matrix made by osteoblasts
and maintained by osteocytes
Blood: Plasma is the matrix where blood cells and
platelets are, but its not made by these cells
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Connective Tissue Fibers:
• Collagen (White):
– Strong collagenous fibers made of protein, collagen that adds strength for holding body parts together.
• Elastic (Yellow)Fibers:
– Elastic fibers made of the protein elastin, are stretchy and add flexibility to certain types of connective tissue
• Reticular fibers: thin collagenous fibers that form supportive networks in a variety of tissues.
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Areolar (or Loose) • Identification: Loose arrangement of thin (elastic and
reticular) and thick (collagen) fibers that criss-cross
• Where Located: surrounding most organs, underneath epi
• Functions: wraps, cushions, holds defensive cells, holds
fluids
1. collagen fibers
2. elastic fibers
3. Fibroblasts (cells that
produce fibers)
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Adipose Tissue (loose)
• Identification: Little extracellular matrix
– greatly enlarged cells, nearly the entire volume of
which is a fat vacuole (adipocytes). Few nuclei
• Where Located: underneath skin,
surrounds organs.
• Functions: energy storage,
cushioning, insulation
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Dense Regular
• Identification: Densely
packed parallel fibers
• Where Located:
ligaments and tendons
• Function: attaches bone
to bone or muscle; resists
tensile (pulling) forces in
single direction
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Dense Irregular
• Identification: The
collagen fibers are in
distinct bundles,
separated by space
• Where Located: dermis
of skin
• Functions: provides
strength; can withstand
pulling in many directions
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Dense Regular
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Reticular Connective Tissue • Identification: Dark-
staining reticular fibers,
numerous nuclei
brownish color is also
distinctive.
• Where Located: spleen
(also bone marrow,
lymph nodes).
• Function: forms
scaffolding to support
loose cells
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Cartilage
• Connective tissue consisting of a dense matrix of
collagen fibers and elastic fibers embedded in a
rubbery ground substance.
• The matrix is produced by cells called
chondroblasts, which become embedded in the
matrix as chondrocytes (mature cell)
• Condrocytes found in spaces in matrix called
lacunae
• No nerves or blood vessels
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Hyaline Cartilage
• Identification: Lacunae
often are paired. Matrix
lacks fibrous appearance,
instead an overall glassy
appearance.
• Where Located: Ends of
long bones, nose, trachea
• Functions: Structural
support; cushions joints.
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Elastic Cartilage
• Identification: Large
lacunae, matrix
contains extensive
dark elastic fibers
• Where Located: ear
lobe, epiglottis
• Function: flexibility,
bendability.
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Fibrocartilage
• Identification: Distinct,
nearly parallel fibers,
Usually blue in color.
• Where Located:
intervertebral disks, pubic
symphysis, menisci of
knee joint.
• Function: resists
compressive forces.
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Compact Bone
• Identification:
Concentric rings
(like tree rings)
• Where Located: bones
• Functions: support,
protection, act as levers,
mineral storage.
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Spongy bone
• Identification:
Spicule (bone) between
areas of bone marrow
(osteocytes in lacunae)
• Where located:
Ends of long bones
• Function: support but
very lightweight
t = trabeculae
m = marrow
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Blood
• Function: Transports nutrients & chemical
messengers to all body tissues and transports
waste from tissues to excretory organs
• Composed of RBC, WBC, platelets, plasma
• Plasma is the extracellular matrix and its
fibers are produced and observed only during
blood clotting
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Red Blood Cells (erythrocytes)
• Carry oxygen to all
tissues
• Lack a nucleus
• Formed in red bone
marrow
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White Blood Cells (leukocytes)
• Fight infection
• Six different types
• Made in red bone
marrow
• Much larger than
RBC’s
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Platelets (thrombocytes)
• Function in blood
clotting
• Not complete cells,
they are fragments of
cells found in bone
marrow