Histogenesis of the Adipose Tissue. 428 



tissue and having a relation to the blood vessels scarcely more intimate 

 than that seen in the renal. It is not a mere differentiation around 

 a blood vessel such as occurs in the subcutaneous tissue (Text Fig. 

 1). If we use Haramar's classification, it is difficult to decide whether 

 we are dealing with primary or secondary adipose tissue-formation. 



The later stages in the development of the omental adipose tissue 

 are not very different from those in the renal. Nests of fat cells 

 form around the small blood vessels makino- the fat lobule. These 



Text P'igure 5. Section through a hjbule of omental preadipose tissue 

 from a 40 cm. foetus, fc, fibrillar connective tissue — not sharply marked off 

 from the preadipose tissue. Pa. Iron-hjiem. stain. Fixation, Zenker's fluid. 

 X335. 



increase in size and gradually become crowded together to form a 

 mass of adipose tissue. In many parts of the omentum the preadipose 

 tissue seems to develop along the course of the blood vessels as in 

 the subcutaneous tissue. 



Preadipose tissue of the brisket. 

 The part of the brisket studied was the region between the ventral 

 surface of the sternum and the pectoral muscles. In this region 

 in the adult we find lobules of adipose tissue separated by heavy 



