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Gall Bladder,

The gall bladder is a specialized portion of the bile duct.  The gall bladder is shaped like a small sack to store bile, it has an absorptive epithelial lining to concentrate bile, and it has a muscular wall to expel bile.

In its absorptive function, the gall bladder epithelium is a highly exaggerated striated duct, as is the functionally similar epithelium of the proximal tubule of the kidney.

Inflammation of the gall bladder is a fairly common problem.  For an image of cholecystitis, see WebPath or Milikowski & Berman's Color Atlas of Basic Histopathology, p. 308.

Historical note:  The Greek name for gall bladder is cholecyst, from chole, bile + cyst, bladder.  The Greek root chole also appears in the word choleric, hot-tempered, irascible, "bilious".  This word is derived from the ancient medical theory that temperament, along with all other aspects of health and disease, is governed by the balance among four humours, allied to the deeper philosophical belief in four elements of fire, water, air and earth.  The four humours are gall (= chole) or yellow bile from the gall bladder, black bile (= melan + chole) from the spleen, blood (Latin sanguis), and phlegm or mucus.  Along with choleric, the modern words melancholy (pensive, depressive), sanguine (confident, cheerful), and phlegmatic (sluggish, stolid) complete the set of terms for humour-based temperaments.

Without due care, a section of the gall bladder could easily be mistaken for one of small intestine.  Therefore, the gall bladder provides an excellent opportunity to observe how various details can serve to distinguish organs which otherwise appear superficially similar.  Since the gall bladder is really just a glandular duct, its structure is much simpler than that of intestine.  

Comments and questions: dgking@siu.edu

SIUC / School of Medicine / Anatomy / David King

Last updated:  17 September 2003 / dgk