Inquiries respecting the anatomy of the eye / [Arthur Jacob].

  • Jacob, Arthur, 1790-1874
Date:
1823
Catalogue details

Licence: Public Domain Mark

Credit: Inquiries respecting the anatomy of the eye / [Arthur Jacob]. Source: Wellcome Collection.

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    the eye, enclosed in a strong sheath, continued from the dura mater, and firmly connected with the sclerotic: that when it approaches the globe of the eye, it becomes diminished in size, and in its passage through the sclerotic, is contracted into the form of a cone, the rounded apex of which comes in contact with a membrane perforated with small holes called the lamina cribrosa, which closes up on the inside the hole in the sclerotic through which the nerve passes: that through the per¬ forations in this membrane the nervous fibres are transmitted, and within the eye form a slight pro¬ jection from which the retina originates.5,# This notion of a lamina cribrosa has had its origin from Albinust, and has arisen from examining the part after the retina had been washed away, and the optic nerve cut off on the outside close to the scle¬ rotic ; an appearance answering the description given of the lamina cribrosa being thus produced. This lamina cribrosa,however, appears to be nothing else than the extremity of the optic nerve where the firmer tubular portion is discontinued. If the sheath of the nerve be slit up through the sclerotic into the globe of the eye, the nerve does not ap¬ pear to cease with a rounded apex behind the la- * Halleri Elementa Physiologiae, tom. v. lib. xvi. sect. 2,-—Zimi de Oculo, cap. iii. sect. 2. Sabatier, Anatoinie, tome ii. p. TO.— Cuvier, Lecons d’Anatomie Ccmparee, tom. ii. p. 412. Rees’s Cy¬ clopaedia, article Eye.—C. Bell’s Anatomy, vol. iii. p. 50. f Moeller, Observationes circa Retinam, sect. 12,13. in Halleri