HistologyHistology

Objective:Objective:

To study different types of tissues To study different types of tissues and identify the followings:and identify the followings:

1- Hyaline Cartilage (C.S)1- Hyaline Cartilage (C.S)

2- Arteries and Veins (C.S)2- Arteries and Veins (C.S)

3- Striated and Cardiac muscles 3- Striated and Cardiac muscles (C.S)(C.S)

4- Neurons and Spinal cord (C.S)4- Neurons and Spinal cord (C.S)

Histology: Microscopic Study of Histology: Microscopic Study of TissuesTissues BiopsyBiopsy: removal of tissues for : removal of tissues for diagnostic purposesdiagnostic purposes

AutopsyAutopsy: examination of organs of : examination of organs of a a deaddead body to determine cause of body to determine cause of deathdeath

Tissues and HistologyTissues and Histology

Major types of adult Major types of adult tissues:tissues:

1- Epithelial 1- Epithelial 2- Connective2- Connective3- Muscle3- Muscle4- Nervous4- Nervous

Number of cell layersNumber of cell layers SimpleSimple StratifiedStratified

Shape of apical surface Shape of apical surface cellscells SquamousSquamous CuboidalCuboidal ColumnarColumnar

Classification of epitheliaClassification of epithelia

Classifications of Classifications of EpitheliaEpithelia

2- Connective Tissues2- Connective Tissues

Two types:Two types: CartilageCartilage BoneBone

C- Supporting connective C- Supporting connective tissuestissues

Cartilage and bone support the bodyCartilage and bone support the body

1- Cartilage:1- Cartilage: Cells called Cells called chondrocyteschondrocytes Cells found in lacunae Cells found in lacunae (capsules)(capsules) PerichondriumPerichondrium separates cartilage separates cartilage

from surrounding tissuesfrom surrounding tissues Three types: hyaline, elastic and Three types: hyaline, elastic and

fibrocartilagefibrocartilage

Supporting connective Supporting connective tissuestissues

Hyaline CartilageHyaline Cartilage

Figure 4.12g

Elastic CartilageElastic Cartilage

Figure 4.12h

FibrocartilageFibrocartilage

Specialized for Specialized for contractioncontraction Three types:Three types:

Skeletal:Skeletal: attached to attached to bonesbones Cardiac:Cardiac: muscle of the muscle of the heartheart Smooth:Smooth: muscle associated with muscle associated with tubular tubular

structuresstructures

3- Muscle tissue3- Muscle tissue

Skeletal Muscle TissueSkeletal Muscle Tissue

Cardiac Muscle TissueCardiac Muscle Tissue

Conducts electrical impulses.Conducts electrical impulses. Conveys information from one Conveys information from one

area to another.area to another.

4- Neural tissue4- Neural tissue

T.S. of Spinal CordT.S. of Spinal Cord

Nerve CellNerve Cell