. Cunningham's Text-book of anatomy. Anatomy. INTEENAL STEUCTUEE OF MEDULLA OBLONGATA AND PONS. 555 In the specific case we are considering the vestibular nucleus and the cerebellum receive their chief supply of afferent fibres from the incoming vestibular nerve: hence there is no reason for migration. Similarly the nucleus gracilis and nucleus cuneatus receive the fibres which come up through the funiculus posterior and remain where they are. But the nuclei pontis, the olivary nucleus, and the arcuate nuclei are " fed " with impulses passing downwards (and some perhaps upwards) in t
. Cunningham's Text-book of anatomy. Anatomy. INTEENAL STEUCTUEE OF MEDULLA OBLONGATA AND PONS. 555 In the specific case we are considering the vestibular nucleus and the cerebellum receive their chief supply of afferent fibres from the incoming vestibular nerve: hence there is no reason for migration. Similarly the nucleus gracilis and nucleus cuneatus receive the fibres which come up through the funiculus posterior and remain where they are. But the nuclei pontis, the olivary nucleus, and the arcuate nuclei are " fed " with impulses passing downwards (and some perhaps upwards) in the basal lamina, close to the median plane, and they " migrate " towards the direction from which their afferent paths are approaching ; the nuclei pontis towards the peduncles of the cerebrum bringing cerebro-pontine fibres from the cerebral cortex, and the olivary nucleus to the neighbourhood of certain descending tegmental tracts and ascending spinal sensory tracts that seem to supply the attractive force, which leads them to forsake the rhombic lip of the alar lamina and migrate into the basal lamina. The majority of the cells destined to form the nuclei pontis wander obliquely upwards and forwards between the facial and acoustic nerves to reach the basal Restifonn body Fasciculus tectospinalis Trigeminal tract passing to the two parts of the medial lemniscus. Vagus nuc]eus Tractus solitarius Descending root of vestibular nerve Vagoglossopharyngeal roots sciculus spinocerebellaris \) posterior Fasciculus longitudiualis inedialis I Nucleus tractus spinalis ^i*"'|S^^^r^p"J~iiervi trigemini [nerve 4lmBi2?*£/^<J 'Tractus spinalis of trigeminal JMM'1 &^jMLll_ ^ucleus ambiguus Wffis&£e;W/ ""Fasciculus rubrospinalis Olivo-cerebellar fibres Fasciculus spinothalamicus jF~Dorsal accessory olivary nucleus Fasciculus spinocerebellaris anterior ' External arcuate fibres â 'Lemniscustmedialis Medial accessory olivary nucleus Fasciculus tegm
Size: 1781px × 1403px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
