Fat is present, in a higher or lesser degree, in almost every anatomical compartment, inside parenchymatous organs, muscles and breasts and it is stored mainly in the omentum (intra-abdominal fat): this is the so-called 'central' fat and it is the most involved in metabolic variations, increasing in obesity and reducing in the case of weight loss. Intra-abdominal fat contributes to a significant degree, but not exclusively, to the increase of waist circumference and sagittal diameter , altering the normal ideal silhouette (Fig. 1a, b); even in normal non-obese subjects, it tends to increase in the elderly, owing to the redistribution of the adipose mass .
Besides the central fat, which is sensitive to weight variations, we recognise some anatomical districts where adipose fat pads are present, where volumes are constant irrespective of the degree of corpulence or even in the event of major weight loss. These are structures devoted to produce more protection in the regions of attrition and have been thoroughly described: around the kidneys, inside the joints, underneath the breasts
(Chassaignac retrommamary bursa), deep in the face (corpus adiposum buccae or bulla of Bichat, adipose body of the orbit, parapharyngeal adipose corpus), inside the hand (corpus adiposum palmare profundum ), and over the os pubis (mons Veneris). This fat has almost no influence on body silhouette and a few on face traits.
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