Considerations on Flechsig's "Gehirn und Seele."

  • Jacobi, Mary Putnam, 1842-1906.
Date:
[1897?]
Catalogue details

Licence: Public Domain Mark

Credit: Considerations on Flechsig's "Gehirn und Seele.". Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    first, as above described, begins to be medullated at eight months; but the second not till nine months, and the third not till several months after birth (Local., pp. 24 and 25). According to Flechsig's description this second division of the sensory system constitutes a special system in the internal capsule which, like the first, passes out by the lateral nucleus of the thalamus, but dorsal to the first sys- tem. It passes to the cerebral cortex, partly to the para- central lobule, and also to the foot of the first frontal con- volution; partly bends inwards at an acute angle, and terminales along the entire length of the gyrus fornicatu>; partly enters the cingulum and runs towards the cornu ammonis. Towards the epoch of birth, the foregoing bundles are joined by another which runs from the lateral nucleus of the thalamus, enters the unciform convolution, and finally reaches the subiculum cornu ammonis. An- other bundle passes from the median centre of the Luys nucleus to the foot of the first and second frontal convo- lutions. The third system becomes medullated from one to several months after birth. It passes in the middle part of the internal capsule from the anterior part of the lateral nucleus, and runs directly to the foot of the third frontal convolution (Local., pp. 24, 25). It is in a foetus nine months old, at term, that Edinger describes as medullated, fibres in the tegmentum, the lemniscus, the brachia (binde- arme), the posterior longitudinal fasciculus, and many fibres of the substantia reticularis. Xow at this epoch, nine months, or the moment of birth, Edinger finds a small bundle of medullated fibres also in the pes pedunculi, the motor tract, and Flechsig assigns the medullization of the pyramidal tract to the self-same time. From this description it follows: First, that all sensory tracts do not ripen at the same times, but that an in- terval of about four months separates the period of medul- lization of the first division from that of the third. Second, that the medullization of motor tracts is