A manual for the College of Surgeons in London, Dublin, and Edinburgh: intended for the use of candidates for examinations and practitioners / [John Steggall].

  • Steggall, John, 1795?-1871.
Date:
1839
Catalogue details

Licence: Public Domain Mark

Credit: A manual for the College of Surgeons in London, Dublin, and Edinburgh: intended for the use of candidates for examinations and practitioners / [John Steggall]. Source: Wellcome Collection.

    182/788 (page 172)
    The superior petrosal is small, and lies upon the supe- rior angle of the petrous bone; it leads from the cavern- ous and pours its blood into the lateral sinus. The inferior petrosal is a continuation of the cavernous sinus ; it rests upon the contiguous borders of the petrous and occipital bone, grooving them, and pours its blood into the lateral sinus. The occipital sinuses are small and irregular, sometimes wanting; they pass from the edge of the foramen mag- num, along the attached margin of the falx minor, into the torcular Herophili; sometimes they communicate with the lateral sinuses, near the anterior margin of the foramen magnum. The cavernous sinus of each side is situated on the side of the body of the sphenoid bone, Anteriorly it receives the ophthalmic vein, conveying most of the blood from the orbit; posteriorly it leads to the petrosal sinuses, and internally unites with the clinoid sinuses. It is formed by a separation of the layers of the dura mater; the lower and internal one, resting on the bones, is thin; the upper one is much thicker, and extends from the clinoid pro- cesses to the petrous bone; it contains within its fibres or lamine the third, fourth, and first division of the fifth nerve. The intermediate space is lined by a delicate mem- brane, continuous with the inner coat of the ophthalmic vein, and this is reflected over the parts which traverse the sinus, so that they are not in immediate contact with the blood; the parts passing through are the carotid ar- tery, with filaments of nerves, forming the carotic plexus, and, on the outer side of the artery, the sixth pair of nerves. There are, besides, numerous tendinous fibres