a. (sb.) Anat. and Path. [SUB- 1 b.] Situated or taking place beneath the arachnoid membrane. Also sb., the subarachnoid space (between the arachnoid membrane and the pia mater).
1839–47. Todd’s Cycl. Anat., III. 641/2. In apoplexy the blood escapes from the ventricle into the sub-arachnoid space. Ibid., 673/2. The subarachnoid fluid.
1843. R. J. Graves, Syst. Clin. Med., ix. 97. Extensive thickening of the membranes of the brain, with subarachnoid effusion.
1893. W. R. Gowers, Man. Dis. Nerv. Syst. (ed. 2), II. 390. Subarachnoid hæmorrhage.
1896. Allbutt’s Syst. Med., I. 189. The perivascular lymphatic sheaths and subarachnoid are filled with fatty products.
1902. Hughes & Keith, Man. Pract. Bot., III. 305. To this subarachnoid tissue is given the name of Pia mater.
So Subarachnoidal, -oidean adjs.
1844. Hoblyn, Dict. Terms Med. (ed. 2), 293. Sub-arachnoïdean fluid, an abundant serous secretion, situated between the arachnoïd and the pia mater. Sub-arachnoïdean space, the space between the arachnoïd and the spinal cord.
1871. W. A. Hammond, Dis. Nerv. Syst., 51. Sub-arachnoidean effusion.
1876. trans. Wagner’s Gen. Pathol., 229. The sub-arachnoidal connective-tissue bands and meshes.
