. The senses mentioned above, are all fundamental senses. However many other senses exist, which are admixtures of two (or more) fundamenlal senses an

, which are admixtures of two (or more) fundamenlal senses and are called synthetic senses. Example: (i) stereognosis, (ii) two point discrimination, pruritus(itching) is also another example of synthetic sense. 4. Epicritic and protopathic senses In the beginning of the current cenlury, Head and his colleagues classified the superficial senses into (a) epicritic, and (b) protopathic senses. Epicritic senses are (i) fine touch, (n) Iwo point discrimination and (iii)) fine gradation of temperature (ability to discriminate between say 35°C and 40°C object). Protopathic senses are crude senses, like crude touch,pain, crude temperature sense, and so on. Protopathic senses are more primitive. When a nerve fiber regenerates after an injury, it is the protopathic senses which return first. 5. Body image Normally we have our body image, that is, we have a clear idea of the different parts of our body in relation to the different objects around us For example, I know how much space my left half of the body occupies and therefore when I walk by the side of a wall (on the left side) I do not walk so close to the wall that my left sided limbs are rubbed against the wall. Somehow, for the maintenance of our body image, parietal lobes must remain intact. THE RECEPTORS 1. Introduction 2. The different receptors 3. Histology 4. Classification 5. Properties ' INTRODUCTION Receptors may be considered as struclures which catch the sensory stimulus. From the receptors, emerge the afferent sensory nerve which eventually reaches the CNS. Thus, receptor is the first structure in the sensory path.