. Of the properties of reflexes, habituation and sensilization have become very important because of their roles in synaptic plasticity (chap 3 sec XA

Babinski's sign almost rules out pyramidal tract lesion. Of the properties of reflexes, habituation and sensilization have become very important because of their roles in synaptic plasticity (chap 3 sec XA), memory and both +ve and -ve learning (chap 6 sec XD) INTRODUCTION 1. Inlroductory nole 2. Classfcation of senses 3. Some commonly used terms Introduction. The sensory system brings informations from Ihe periphery to the CNS. Conventionally, Ihe sensory system is divided into (a) general senses, (b) special senses. No salisfactory classification of senses exists. However, some existing classifications are given below. One form of classification is given on table 10B1.1.1. The special senses have been discussed in section XB2. The present subsection XB1 deals only with the general sensations. Senses may be classified in another way. In this form, receptors, rather than the senses are classified. However, end result remains the same: 1. Exteroceptors are those receptors which sense the immediate external (surrounding) environment, eg. cutaneous receptors for touch, pain, heat, cold etc. Thus the sense detecled by exteroceptors may be called exteroception. 2. Telereceptors are receptors where the origin of thestimulus comes from a distance, (eg, vision, audition). This _form of sense, thus, can be called telereception.