IDENTIFICATION POINTS
- MUCOSA LINED BY STRATIFIED SQUAMOUS NON-KERATINIZED EPITHELIUM
- SUB-MUCOSA CONTAINING ESOPHAGEAL GLANDS
- MUSCULARIS EXTERNA CONTAINING INNER CIRCULAR AND OUTER LONGITUDINAL MUSCLE LAYERS
INTRODUCTION
– EXTENDS FROM LOWER END OF PHARYNX TO CARDIAC END OF STOMACH
– LENGTH: 25cm
– DEVELOPS IN 4th WEEK OF INTRAUTERINE LIFE FROM TRACHEOESOPHAGEAL BUD
STRUCTURE
MUCOSA:
INNER MOST LAYER OF ESOPHAGUS LINED BY STRATIFIED SQUAMOUS NON-KERATINIZED EPITHELIUM RESTING ON BASEMENT MEMBRANE.SURFACE EPITHELIUM MAY CONTAIN A FEW CELLS BELONGING TO APUD CELL SYSTEM.
LAMINA PROPRIA:
LOOSE CONNECTIVE TISSUE LAYER BENEATH THE EPITHELIUM ,FOLDED INTO MANY FINGER LIKE PROJECTIONS CALLED PAPILLAE.
MUSCULARIS MUCOSA/INTERNA:
CONSISTS OF THIN LAYER OF LONGITUDINAL MUSCLE FIBRES.
SUBMUCOSA:
MADE UP OF LOOSE AREOLAR CONNECTIVE TISSUE RICH IN CONNECTIVE TISSUE FIBRES,CELLS AND BLOOD VESSELS. CONSISTS OF COMPUND TUBULO ALVEOLAR MUCOUS GLANDS OR ESOPHAGEAL GLANDS.
MUSCULARIS EXTERNA:
CONSISTS OF OUTER LONGITUDINAL AND INNER CIRCULAR MUSCLE FIBRES.
ADVENTITIA
OUTER MOST PROTECTIVE LAYER MADE UP OF DENSE IRREGULAR CONNECTIVE TISSUE.
CLINICAL
- REFLEX ESOPHAGITIS DUE TO REFLUX OF GASTRIC JUICE FROM STOMACH TO LOWER END OF ESOPHAGUS CAUSING DESTRUCTION OF SURFACE EPITHELIUM AND INFLAMMATION.
- REPEATED REFLUX ESOPHAGITIS—->COLUMNAR METAPLASIA KNOWN AS BARRETTES ESOPHAGITIS.
MANAGE YOUR TIME 1996 