HISTOLOGY OF URETER(TS)

HISTOLOGY OF URETER(TS)

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IDENTIFICATION POINTS

  • STAR SHAPED LUMEN.
  • MUCOSA LINED BY TRANSITIONAL EPITHELIUM.
  • INNER LONGITUDINAL,MIDDLE CIRCULAR AND OUTER LONGITUDINAL MUSCULAR COAT.

INTRODUCTION

– URETER IS A MUSCULAR COAT LIKE STRUCTURE WHICH CONNECTS THE KIDNEY TO URINARY BLADDER.

STRUCTURE

MUCOSA:

INNER MOST LAYER OF URETER LINED BY TRANSITIONAL EPITHELIUM WITH LAMINA PROPRIA BENEATH IT. MUCOSA IS THROWN INTO MANY FOLDS WHICH GIVES A STAR SHAPED LUMEN APPEARANCE TO THE LUMEN.

MUSCULAR LAYER:

IT IS FOUND BELOW THE LAMINA PROPRIA. CONSISTS OF INNER LONGITUDINAL,MIDDLE CIRCULAR AND OUTER LONGITUDINAL MUSCLE LAYERS.

ADVENTITIA:

OUTERMOST PROTECTIVE COVERING LAYER MADE UP OF DENSE IRREGULAR CONNECTIVE TISSUE.

FUNCTIONS:

  • TRANSITIONAL EPITHELIUM PREVENTS THE ENTRY OF URINE AND ITS TOXIC SUBSTANCES INTO THE URETER BY DIFFUSION.
  • MUSCULAR LAYER IS RESPONSIBLE FOR PERISTALSIS IN URETER WHICH PUSHES THE URINE FROM KIDNEY TO URINARY BLADDER.
  • ADVENTITIA IS PROTECTIVE AND SUPPORTIVE IN FUNCTION.

CLINICAL:

  • FORMATION OF STONES IN THE KIDNEY IS CALLED RENAL CALICULI AND IS MORE COMMON IN URETER. IT IS CHARACTERISED BY INTENSE COLIC PAIN IN THE LOIN.
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