A text-book of physiology for medical students and physicians . aris (parstonsillaris); C1, cms primum ; C2, crus secundum; Spr, sulcus primarius ; Sp, sulcusparamedianus ; Si, sulcus intercruralis.—(After van Rynberk.) followed by movements of the head (head nystagmus), whichindicate an abnormal innervation of the neck muscles. Injuryon one side of the crus primum of the ansiform lobule is followedby abnormal movements of the forefoot of the same side, whilesimilar injuries to the crus secundum result in abnormal move-ments localized to the hind foot. Extirpation of a lobulusparamedianus caus
A text-book of physiology for medical students and physicians . aris (parstonsillaris); C1, cms primum ; C2, crus secundum; Spr, sulcus primarius ; Sp, sulcusparamedianus ; Si, sulcus intercruralis.—(After van Rynberk.) followed by movements of the head (head nystagmus), whichindicate an abnormal innervation of the neck muscles. Injuryon one side of the crus primum of the ansiform lobule is followedby abnormal movements of the forefoot of the same side, whilesimilar injuries to the crus secundum result in abnormal move-ments localized to the hind foot. Extirpation of a lobulusparamedianus causes rolling movements round the long axisof the body or bending of the body to one side (pleurothotonus).It is to be expected that extension of this work will throw muchlight upon the specific relations of the cortex of the cerebellumto the musculature of the body. The Medulla Oblongata.—In the medulla oblongata we mustrecognize a region of special physiological importance in that it * Van Rynberk, General Review in Ergebnisse der Physiologie, 7,653, Fig. 106.—Nuclei of origin of motor and primary terminal sensory nuclei of cerebralnerves (Held); Schematically represented in a supposedly transparent brain stem viewedfrom behind. (Nuclei and roots of motor nerves in light red, of sensory nerves inpurple. Cochlear nerve in yellow.) 4, nucleus of the third nerve (n. oculomotorii);5, nucleus of the fourth nervs (n. trochlearis); 6, the fourth nerve; 7, the descending(motor) root of the fifth nerve; 8, the principal motor nucleus of the fifth nerve;9, the semilunar ganglion (g. Ga-sseri); 26, the ascending (sensory) root of the fifthnerve; 14, nucleus of the sixth cranial nerve; 15, nucleus of the facial (seventh)nerve; 16, the facial nerve; 34, 33, nucleus of the vestibular branch of the eighth cranialnerve; 32, ventral nucleus of the cochlear branch of the eighth nerve; 27, dorsal nucleusof the cochlear branch of the eighth nerve; 19, 29, the glossopharyngeal nerve: 18
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