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Connective Tissue Histology
By
Dr. Mudassar Ali Roomi (MBBS, M. Phil)
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TYPES OF CONNECTIVE TISSUE
1. True (proper) Connective Tissue:a. Loose Connective Tissue (areolar C.T, adipose C.T)
b. Dense Connective Tissue (regular and irregular)
2. Supportive Connective Tissue:a. Cartilage (hyaline, elastic and fibrocartilage)
b. Bone (spongy and compact)
3. Liquid Connective Tissue:
a. Blood
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EMBRYONIC CONNECTIVE
TISSUE
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True or Proper Connective Tissue
1. Loose Connective Tissue:
a. Areolar connective tissue:
Widely distributed under epithelia
b. Adipose tissue:
present in Hypodermis (superficial fascia), within abdomen and breasts
c. Reticular connective tissue:
present in lymphoid organs such as lymph nodes and spleen
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LOOSE Connective Tissue:
1. Loose Areolar Connective Tissue:
consists of all 3 types of fibers, several types of
cells, and semi-fluid ground substance
found in subcutaneous layer and mucous
membranes, and around blood vessels, nerves
and organs
function = strength, support and elasticity
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Loose Connective Tissue
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Loose Areolar Connective
Tissue
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LOOSE Connective Tissue:
2. Adipose tissue
consists of adipocytes; "signet ring cells.
They store energy in the form of triglycerides.
found in subcutaneous layer, around organs andin the yellow marrow of long bones
function = supports, protects and insulates, and
serves as an energy reserve
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Adipose tissue
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White Adipose (Fat) Cells
Occur singly or in groups
When adipose cells predominate, the connective tissue is adipose connective
tissue
Store fat (lipid) as single large fat droplet primarily as tryglycerides
Appear as empty cells because lipid is dissolved during tissue preparation
Distributed throughout body, serves as insulation, and forms fat pads for
organ protection
Highly vascularized owing to high metabolic activity
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Brown Adipose Cells
Cells smaller than white adipose cells; store lipid as multiple
droplets Best developed in hibernating animals
In newborns (between scapulae) or animals emerging from
hibernation, generates body heat
Norepinephrine from sympathetic nervous system promoteshydrolysis of lipids
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LOOSE Connective Tissue:
3. Reticular CT
Consists of fine interlacing reticular fibers and
reticular cells
Found in liver, spleen and lymph nodes Function = forms the framework (stroma) of
organs and binds together smooth muscle tissue
cells
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Reticular CT
