. Essentials of physiology, arranged in the form of questions and answers, prepared especially for students of medicine. ? Removal of those bodies produces total loss of vision ; destruc-tion of one of them produces blindness in the eye of the oppositeside. It also produces rotatory movements of the body resemblingthose occurring after division of the crus cerebri, save that themovements are slower. What is the effect of injury to these bodies? They cannot be said to be the centres of vision, but seem to bethe centres of correlation between retinal impressions and oculo-motor reactions. 134 ES
. Essentials of physiology, arranged in the form of questions and answers, prepared especially for students of medicine. ? Removal of those bodies produces total loss of vision ; destruc-tion of one of them produces blindness in the eye of the oppositeside. It also produces rotatory movements of the body resemblingthose occurring after division of the crus cerebri, save that themovements are slower. What is the effect of injury to these bodies? They cannot be said to be the centres of vision, but seem to bethe centres of correlation between retinal impressions and oculo-motor reactions. 134 ESSENTIALS OF HUMAN PHYSIOLOGY. What is the function of the corpora striata ? They are centres of innervation for the same movements as existin the cerebral cortex, but of a lower grade of specialization. Injury to the corpora striata on one side prevents the communi-cation between the will and the muscles of the opposite half of thebody, so that palsy results, or, in other words, hemiplegia. Thecorpus striatum may, therefore, be considered as the motor con-nection between the cerebrum and the crus cerebri. Fig. Diagram of brain and medulla oblongata, a, spinal cord; 6, b, cerebellum divided,and above it tbe valve of Vieussens partially divided ; c, corpora quadrigemina; d, d,optic thalanii; e, pineal body; /, /, corpora striata; g, g, cerebral bemispheres insection ; h, corpus callosum ; i, fornix; I, I, lateral ventricles; 3, third ventricle; 4,fourth ventricle ; 5, fifth ventricle, bounded on each side by septum luciduni. ( ) What is the function of the optic thalami ? If the optic thalamus is destroyed on one side sensation of theopposite side of the body is impaired or lost. It is, therefore,regarded as the sensory band between the cerebrum and the cruscerebri. THE MEDULLA OBLONGATA. 135 What are the functions of the cerebellum ? It is absolutely insensible to irritation and may be cut awaywithout any signs of pain; its removal from the body or destruc-tion by d
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