Licence: Public Domain Mark
Credit: Architecture of the brain / by Wm. Fuller. 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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![8 9-10, 10* to 18*. DISSECTION. 29 connected behind with the brachinm posterius, and in front with the lower division of the optic tract, and is called tlie corpus geniculatum internum. External and above the corpus geniculatum internum, upon the outer division of the extrem- ity of the optic tract, is an elevation, the corpus geniculatum corpus genicuia externum. These bodies are apparently the outer terminations '''S- -^ '■•• of the brachia, but, as before stated, the major part of the fibers of the brachia passes beneath the thalamus and optic connection of t tract to the internal capsule. int'lniTi Ipsuie The basal ganglia:—Upon each side of the third ventricle, resting upon the upj)er extremities of the peduncles or cruri cerebri, are two large masses of gray matter, one on each side, the basal ganglia of the cerebum. Each mass is composed of three large ganglia, two of which are internal, and one exter- nal to a broad and thick layer of white fibres, the internal capsule. The capsule is seen projecting above, from between the external and internal ganglia, as an elevated tract com- posed of transverse lamina or bundles of fibres. The fibres of the antei'ior portion of either internal capsule are directed Distribution of the internal capsule. forward toward the anterior lobe of the cerebrum, the middle Figs. 7-9-13. fibres upwards to the parietal region, and the posterior backwards and outwards into the occipital and temporal lobes of the brain. The internal capsule radiates like the pinna of the ear, an interspace being left opposite the anterior perforated space interspace in cap- between the frontal and temporal lobes of the hemisphere. i8to2o.''' In consequence of this disposition of the fibres of the capsule, it encloses a conical concavity, open externally, which is filled by a mass of gray matter, the lenticular nucleus, or external Lenticular nucleus basal p-anojlion. fumei. Figs. 7- At its posterior part, the internal capsule sweeps around an •abrupt curve as it descends to form the roof of the middle cornu of the lateral ventricle. The ]-eflected portion of the](https://iiif.wellcomecollection.org/image/b21221649_0037.jp2/full/800%2C/0/default.jpg)
