In music, surface is the character of the salient immediate detail. It may be thought of as content plus the more general definition of texture, and is often opposed to form.
In painting, surface is the support upon which paint is applied and the character and texture of the visible paint.
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The skin being the chief sensory surface of touch, it is there that the sense is most highly developed both as to delicacy in detecting minute pressures and as to the character of the surface touched.
In the great majority of Mammalia the general surface of the skin shows sensitiveness, and this is developed to a high degree on certain parts, such as the lips, the end of a teat and the generative organs.
The sensibility of the limbs is finer in the transverse axis than in the long axis of the limb, to the extent of k on the flexor surface of the upper limb and 4 on the extensor surface.