Bauhaus-Universität Weimar

Dictionary of philosophy and psychology including many of the principal conceptions of ethics, logics, aesthetics ... and giving a terminology in English, French, German and Italian, vol. 1 [a-laws]
Baldwin, James Mark
Flocculus. One of the lateral projections of the 
cerebellum. A subordinate portion forms the para- 
Fluid, Cerebro-spinal. A clear fluid, somewhat 
resembling lymph, filling the brain ventricles and the 
subarachnoid space. 
Folium Vermis. One of the lobuli of the median 
lobe of the cerebellum, lying on its dorsal surface. A 
modern usage applies the term folium generically for 
gyri of the cerebellum, limiting the application of 
gyrus to the cerebrum. 
Foramen of Magendi. An opening through the 
dorsal roof of the medulla communicating with the 
subarachnoid space. 
Foramen of Monro : see Portae. 
Forceps. That portion of the callosal fibres cloth¬ 
ing the caudal cornu of the lateral ventricles. 
Fore-brain : see Prosencephalon. 
Fornix. A complicated fibre system connecting 
the hippocampus with other parts of the brain. See 
Columnae, Corpus and Crura Fornicis, and Fimbria. 
Fossa Sylvii. The depression in the lateral aspect 
of the cortex cerebri in which the insula is situated. 
Fovea Limbica. A depressed line separating the 
olfactory region of the ventral aspect of the hemi¬ 
sphere from the pallium proper. 
Fundamental Plate. One of the regions of the 
medullary tube. A longitudinal zone on either side 
of the basal plate containing the origins of the motor 
Funiculus Cuneatus. The medullary continua¬ 
tion of the column of Burdach of the spinal cord. 
Funiculus Gracilis. The medullary continua¬ 
tion of the column of Goll of the spinal cord. A terete 
fibre bundle immediately adjacent to the dorso-median 
line of the medulla. 
Ganglion : see special article on this topic. For 
many current descriptive terms beginning with gan¬ 
glion see Nucleus. 
Gasser’s Ganglion. The ganglion on the root of 
the fifth cranial nerve. 
Genu. A purely descriptive term indicating the 
abrupt flexure of an organ or tract, as the genu of the 
root fibres of the seventh nerve, or the genu corporis 
Glomerulus Olfactorius. One of the aggregates 
of fibres formed by the intermingling of the terminal 
arborizations of the olfactory radices (‘ nerves ’) with 
the dendrites of the mitral cells of the olfactory bulb 
(pero). See Radix Olfactorius. 
Goll’s Column. The median dorsal bundle of the 
cord which is continued into the medulla as the 
funiculus gracilis. 
Gower’s Tract. A tract from the spinal cord to 
the cerebellum ; the ascending antero-lateral tract of 
the cord. By some authors regarded as going to the 
cerebrum as well as to the cerebellum. 
Gyrus. One of the folds or convolutions between 
the fissures of the cerebral cortex. A gyrus of the 
cerebellum may conveniently be distinguished as a 
folium. For the terminology of the gyri see the 
Habenula or Habena : see Nucleus Habenulae. 
Hemisphere. One of the lateral halves of the 
cerebrum. Also applied to the lateral lobes of the 
cerebellum, except the vermis. 
Hind-brain. The cerebellum or the cerebellum 
and pons ; sometimes also applied to the cerebellum 
and medulla or to the medulla alone. 
Hippocampus. The cornu ammonis or caudo- 
median portion of the cerebral cortex, which is curiously 
conduplicate and partly rolled by a reverse curve into 
the ventricle. The osmotic cortical region. 
Hippocampus minor : see Calcar. 
Horn : see Cox-nu. 
Hypophysis. A composite body formed by the 
union of an outgrowth of the mucous membrane of 
the fauces with a process from the infundibulum. 
Hypothalamus. The ventral portion of the thala¬ 
mus, including the infundibulum. Contrasted with 
the epithalamus. 
Infundibulum. The ventral projection of the 
hypothalamus with the corresponding portion of the 
diacoele. The hypophysis comes into relation with 
the brain at this point. 
Insula [Reili], A submerged gyrus lying in the 
Sylvian fossa, and protected (in man) by the opercula. 
Isthmus. The constricted part of the brain imme¬ 
diately cephalad of the cerebellum. 
Iter. The tube-like remnant of the second em¬ 
bryonic vesicle ; the cavity of the mesencephalon, or 
mesocoele ; the aquaeductus Sylvii. 
Lamina Terminalis. That part of the median 
wall of the fore-brain which extends from the preoptic 
recess to the paraphysis. It is supposed to contain 
the morphological front, or cephalic extremity, of the 
nerve tube. See Neuropore. 
Laqueus : see Lemniscus. 
Lemniscus. The fillet ; a bundle of sensory fibres 
extending from the lateral aspects of the medulla to 
the mesencephalon. It contains ascending tracts from 
the several sensory nuclei of the medulla and spinal cord. 
Limbic Lobe. The mesal part of the pallium and 
the ventral structures of the hemispheres, including 
the hippocampus, septum, gyrus fornicatus, parol¬ 
factory region, &c. All of these, except possibly the 
gyrus fornicatus, seem to be associated with the 
olfactory function. 
Lingula. One of the lobes of the vermis cerebelli. 
Lobus. A term applied to poorly defined areas of 
the cerebrum ; a more extensive term than gyrus, as 
frontal, temporal, occipital lobes. 
Lobus Olfactorius. The protuberance of the cere¬ 
brum, from which arises the pes olfactorius. 
Luys’ Body : see Nucleus Subthalamicus. 
Lyra [Davidis]. A triangular median area be¬ 
tween the callosum and the corpus fornicis. 
Mantle : see Pallium. 
Mauthner’s Fibres. Large fibres in the spinal 
cord arising in cells connected with the roots of the 
eighth nerve. They are found in tailed amphibia and 
fishes, and are probably associated with the power of 
equilibrium in a fluid medium. 
Medulla Oblongata. The prolongation of the 
spinal cord5 cephalad which surrounds the metacoele, 
or chamber formed from the third embryonic vesicle, 
with the exception of the cerebellum. The pons is 
sometimes excluded. The medulla and cerebellum 
together constitute the rhombencephalon. The me¬ 
dulla is primarily the seat of the nerve centres connected 
with the vital somatic processes. 
Medullary tube. The embryonic nervous system 
at a very early period of its development, immediately 
after its invagination from the ectoderm, and while 
still preserving its primitive character of an undifferen¬ 
tiated epithelial tube. 
Meninges : see Bbain. 
Mesencephalon. The mid-brain, comprising the 
corpora quadrigemina tegmentum and pes pedunculi. 
Mesocoele : see Iter. 
Mesostriatum. One of the parts into which the 
axial lobe of some vertebrates has been divided. 


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