Page:Muscles and Regions of the Neck.djvu/9

Rh general investment; being prolonged without interruption, below, into the superficial fascia of the chest,—above, into that of the head and face. It consists here, as elsewhere, of two layers, which have the local peculiarity of being separated by the platysnia myoides in the greater part of their extent. Its deeper layer occurs in the form of delicate, scarce, lax, fatless areolar tissue, interposed between the proper aponeurosis of the region and the platysma myoides, furnishing means for the loose gliding of this muscle, and continued, without adhesion or sensible change, into the adjoining regions. Its subcutaneous layer is of coarser materials and of less uniform thickness, is in close union with the skin, and follows its movements: it contains the variable amount of fat, which the region presents; and so, though it