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GALLBLADDER

The gallbladder is a

hollow, pear-shaped

organ attached to the

lower surface of theliver, capable of storing

3050 mL of bile.

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Histology of gallbladder

The wall of gallbladder

is composed of

following three coats:1. Mucosa

2. Muscularis

3. Avdentitia/serosa

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1: Mucosa of gallbaldder

Mucosa is thrown intonumerous temporaryfolds. Folds areparticularly evidentwhen the gallbladder isempty.

Epithelium: simplecolumnar. No gobletcells.***

Small tubuloalveolarglands near the neck.

Lamina propria:delicate reticularconnective tissue. It isrichly vascularized.

No muscularis mucosa.***

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2: Muscularis of gallbladder

It is also called adfibromuscular layer.

It consists of a

meshwork ofinterlacing bundles ofsmooth muscle fibersb/w which arepresent collagen and

reticular fibers. Outer to the

muscularis, denseirregular C.T ispresent called as

perimuscular layer.

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3: Adventitia/serosa of gallbladder

Superior surface which

is attached to liver is

covered by adventitia

Elsewhere it is coveredby peritoneum (serosa).

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Functions of gallbladder

Storage of bile followed

by emptying (function

of cholecystokinin and

Ach). Concentration of bile by

reabsorption of water

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How to draw it!

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I.D Points

Mucosal folds are

present

No muscularis mucosae

Absence of goblet cellsand crypts of Liberkuhn

Fibromuscular layer

Perimuscular layer

serosa