What are the major tissues of the gallbladder?

The gall bladder is composed of the following major tissues.

The epithelium
This is the layer found innermost in the gall bladder.

Submucosa 
This is a thin layer of tissue composed  of loose connective tissue.

Smooth Muscular tissue.
This tissue forms a muscular layer in transverse, oblique  and longitudinal directions and these muscular tissue contracts to expel bile from the gall bladder.

Perimuscular tissue
This is a tissue that is fibrous in nature and is a connective tissue.

Serosa
This is quite a thick layer of tissue. It covers the gall bladder's outer surface . It contains lymphatic network, nerves and large blood vessels .Where it is connected to the liver it is known as adventia.  In the region that is not attached there is found an outer layer of loose connective tissue (serosa) and another kind of tissue known as mesothelium.