An introductory psychology, with some educational applications . ingit to the conditions of its life and of making such changesin those conditions that it may have a fuller and richer life. Sensory nerves. To begin, then, with the nervous fila-ments which receive stimulations. These nerves are dis-tributed to all the sensitive parts of the body and, indeed,make that sensitiveness possible. They consist of finewhitish threads or filaments which end in various spreadingbranchlike ways in the various sense organs, the skin, theretina of the eye, the tongue, etc. These are the fibrouselongations o
An introductory psychology, with some educational applications . ingit to the conditions of its life and of making such changesin those conditions that it may have a fuller and richer life. Sensory nerves. To begin, then, with the nervous fila-ments which receive stimulations. These nerves are dis-tributed to all the sensitive parts of the body and, indeed,make that sensitiveness possible. They consist of finewhitish threads or filaments which end in various spreadingbranchlike ways in the various sense organs, the skin, theretina of the eye, the tongue, etc. These are the fibrouselongations of the neurones spoken of above. A frayed-out bit of string they have been likened to. Followingalong from the sense organs inward, we find these fibersuniting into bundles, eventually forming a nerve cable ortrunk. These nerve trunks, with the exception of those inthe head, make their way to the spinal cord. The nervetrunks which carry the stimulations from the sense organssituated in the head, — the eyes, ears, tongue, etc., — 36 AH mTEODUCTORY PSYCHOLOGY. Fig. 2. The brain from below (the base of the brain). Gross structuresand cranial nerves are shown I, ceiebrum; II, cerebellum; III, pons Varolii; IV, medulla, or bulb; V,spinal cord; 1, olfactory nerve, the nerve of smell; 2, optic nerve, the nerveof sight; 3, 4, 6, nerves sux^plying the muscles of the eyeball; 5, sensorynerve of face (mainly) ; 7, motor nerve of face; 8, auditory nerve, the nerveof hearing (mainly) ; 9, sensory part is nerve of taste, motor part connectedwith pharynx; 10, 11, nerves with various sensory and motor functions;12, motor nerve to tongue muscles fiiid their way directly to the brain and are called cranialnerves. These fibrous filaments used for conveying stimu-lations to tlie brain and spinal cord are called sensory or THE NERVOUS SYSTEM 37 afferent nerves, or nerve courses. They are also calledperipheral nerves or neurones, although on this functionalclassification of neurones the name woul
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