Download - Lect. 5a connective tissue types
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Lect 6.
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Types of Connective Tissue
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Loose CT
consists of a number of cell types embedded in a matrix
a large amount of ground substance in which fibers are arranged in a loose irregular manner.
found in all parts of the body responsible for binding various structures
together muscle fibers to muscle fibers skin to underlying tissues. Various membranes and mesenteries
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Mesentery – Loose / areolar CT
Mesenteries in the small intestine of cat.
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Loose CT
comprises all the main components of CT proper. comprises all the main components of CT proper. With no predominant cellWith no predominant cell fibroblasts and macrophages - most numerous fibroblasts and macrophages - most numerous
cells, but all the other types of CTcells are also cells, but all the other types of CTcells are also presentpresent
With moderate amount of collagen, elastic, and With moderate amount of collagen, elastic, and reticular fibers reticular fibers
has a delicate consistencyhas a delicate consistency it is flexible, it is flexible, well vascularizedwell vascularized not very resistant to stress.not very resistant to stress.
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Loose CT
fills spaces between groups of muscle cells
supports epithelial tissue
forms a layer that sheathes the lymphatic and blood vessels
Found in: papillary layer of the
dermis Hypodermis serosal linings of
peritoneal and pleural cavities, and in glands
mucous membranes (wet membranes that line the hollow organs) supporting the epithelial cells.
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Papillary layer of the dermis – Loose CT
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Dense connective tissue
adapted to offer resistance and protection
fewer cells and a clear predominance of collagen fibers
Dense CT is less flexible far more resistant to stress than is
loose CT.
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Dense irregular CT
when the collagen fibers are arranged in bundles without a definite orientation.
collagen fibers form a 3-dimensional network
provide resistance to stress from all directions. dermis.
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Reticular dermis: Dense irreg. CT
Blue arrow indicates the reticular dermis
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Dense regular CT
The collagen bundles are arranged according to a definite pattern aligned with the linear orientation of
fibroblasts in response to prolonged stresses exerted in the same direction;
offer great resistance to traction forces. tendons (attach muscle to bone) most ligaments (attach bone to bone) aponeuroses (sheetlike tendons that attach
muscle to muscle or muscle to bone.
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Tendons – Dense regular CT
elongated cylindrical structures attach striated muscle to bone
rich in collagen fibers white and inextensible have parallel, closely packed
bundles of collagen separated by a small quantity of intercellular ground substance.
fibrocytes contain elongated nuclei parallel to the fibers and sparse cytoplasmic folds that envelop portions of the collagen bundles.
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Asignment: Determine the Connective Tissues types found in the following structures.
Fats in newborn Fats in the belly of
adults Tunica intima of
large artery Dermis of the skin Ear auricle Wharton’s jelly
(umbilicus) Mesentery
Splenic capsule Stem cell tissue Tendons Glisson’s capsule of
the liver Hypodermis of the
skin Precursor cells in
primitive supporting tissue
Ligaments Muscle fascia