24 CLASSIFICATION OF TISSUES. 
What is mucoid tissue ? 
It is an embryonal tissue having a large amount of intercellular sub- 
stance, which contains mucin. This intercellular substance contains 
numerous fibres and a few scattered fusiform and branching cells. 
Give an example of this form of tissue ? 
The umbilical cord. In this the intercellular substance is very 
abundant, and has received the name of Wharton’s jelly. 
What is the microscopical appearance of adipose tissue ? 
It seems to be made up of numerous small vesicles filled with a fatty 
or oily substance. These vesicles are found most often lodged in the 
meshes of areolar tissue. 
Where is adipose tissue found in the human body ? 
It is widely distributed. It is very abundant in subcutaneous 
areolar tissue. It is found about the kidney, heart and around the 
joints. Also in the meser.tery and omentum and in marrow of bones. 
Where is adipose tissue never found normally ? 
It is not found in the lungs except near their roots, and never in the 
cranium, nor in the subcutaneous areolar tissue of the eyelids and 
penis. 
What are other features concerning adipose tissue ? 
It is well supplied with bloodvessels- with which the lymphatic 
vessels are in close relation. No nerves terminate in it, although 
nerves supplying other parts pass through it. 
How is adipose tissue developed ? 
_ At about the fourteenth week of intra-uterine life minute droplets 
of fat are deposited in certain connective tissue cells. These droplets, 
gradually increasing in size, finally coalesce, forming a single large 
drop. This drop, increasing in size, pushes the cell-protoplasm out to 
form the wall of the fat-vesicle. The nucleus of the connective 
tissue cell is also pushed out to the periphery of the vesicle, and may 
finally, through pressure, atrophy and disappear. 
What is the structure of reticular tissue ? 
It is composed of a fine network or reticulum resembling that in 
white fibrous connective tissue. The spaces between the ‘fibres 
communicate one with another and are filled with fluid instead of inter- 
cellular substance. 
