. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 632 NERVOUS SYSTEM. (NERVOUS CENTRES. THE MENINGES.) dinal sinus above; one for the straight sinus in front; two for the lateral sinuses on each side ; and two for the occipital sinuses inferiorly (Jig. 362, 0-. Posterior part of the cranium removed, to shew the dura mater and the superior longitudinal, and the lateral sinuses, ivith the torcular Herophili. e, lateral sinus ; t, torcular Herophili; s, superior longitudinal sinus. Lateral sinuses.—From each side of the con- flux of the sinuses, there proceeds in a some- w
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 632 NERVOUS SYSTEM. (NERVOUS CENTRES. THE MENINGES.) dinal sinus above; one for the straight sinus in front; two for the lateral sinuses on each side ; and two for the occipital sinuses inferiorly (Jig. 362, 0-. Posterior part of the cranium removed, to shew the dura mater and the superior longitudinal, and the lateral sinuses, ivith the torcular Herophili. e, lateral sinus ; t, torcular Herophili; s, superior longitudinal sinus. Lateral sinuses.—From each side of the con- flux of the sinuses, there proceeds in a some- what serpentine course outwards, downwards, and forwards, a wide canal, the largest of the sinuses, which conveys the blood from the torcular to the internal jugular vein. A groove exists on each side of the internal occipital pro- tuberance, for the reception of this sinus, which marks the occipital bone, the mastoid portion of the temporal, and a small portion of the occipital bone again. In a great portion of their course, the lateral sinuses correspond to the posterior margin of the tentorium cerebelli, as far forwards as the mastoid portion of the tem- poral bone. Here each sinus winds downwards to reach the jugular foramen in the posterior lacerated opening. These sinuses are never equal; that of the right side being, with few exceptions, the larger, a circumstance which Vicq d'Azyr, Soemmering, and Kudolphi attri- buted to the fact that most persons sleep on the right side, on which account the blood is apt to accumulate to that side. They are more capacious at their termination in the jugular veins than at their commencement from the torcular. The inner surface of this sinus is like that of all the others ; it is not, however, tra- versed by any of the bands which are found so numerous in the longitudinal sinus. Cruveil- hier states that he once saw in the horizontal portion of this sinus, a few of the Pacchionian bodies. In its course each lateral sinus receives vein
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