1849, Jones Quain (author), Richard Quain and William Sharpey (editors of the fifth London edition), Joseph Leidy (editor of the first American edition), Human Anatomy (first American edition, from the fifth London edition), volume II, “Nervous System”, ‘Cerebro-Spinal Axis’, «Internal Structure of the Cerebro-Spinal Axis», ‹Internal Structure of the Cerebrum›, page 238:
In this dissection, the convolutions of the island are first removed; beneath the white matter of those gyri, a thin layer of gray substance is met with, which has been named the claustrum (Burdach): deeper than this, white matter again appears,— forming, however, but a very thin layer,— on removing which the extraventricular portion of the corpus striatum is exposed.
ibidem:
Lastly, it may be mentioned, that if the brain be cut through in a plane perpendicular to the surface of the island, the section of the gray layer, named the claustrum, appears as a narrow dark line situated between the island and the corpus striatum.
The gray matter of each corpus striatum is continuous below with that of the anterior perforated space; and on its outer side, is the thin layer of gray matter named the claustrum, the connexions of which are not well understood.
1889, William Browning, “Brain” in A Reference Handbook of the Medical Sciences: Embracing the Entire Range of Scientific and Practical Medicine and Allied Science, ed. Albert H. Buck, volume VIII, § 126: ‘Prop. LXXXII.’, page 135/1:
The lenticula.— Between the caudatum and the cortex the greatly thickened hemicerebral wall presents (a) the medullary lamina called capsula (§ 127); (b) next the cortex, a sub-circular disk of cinerea, the claustrum (better shown in Fig. 4795); and (c) the lenticula, consisting of three zones, all more or less striated, the ental the smallest, and the ectal, also called putamen, the largest (Figs. 4731 and 4732). The lenticula, like the claustrum, may be a dismemberment of the cortex.
1822, Carl Friedrich Burdach, Vom Baue und Leben des Gehirns, volume II, division iii: “Vom groſsen Hirne”, chapter i: ‘Vom Stamme des groſsen Hirns’, § 181: «Vormauern», page 132:
An der äussern Fläche der äussern Capsel, und an der innern Fläche der Belegungsmasse, welche als die Seitenfläche des Stammlappens oder als Insel erscheint, liegt die V o r m a u e r (claustrum) als eine Schicht grauer Substanz, welche dem Linsenkerne parallel sich ersteckt.
