Fig. 3.
The Occipital Bone Separated at its Conjunction from the rest of the Bones of the Cranium.
A, The External Convext Surface of the Occipital-bone, where the Muscles Extending the Head, are Implanted, and Part of the Musculus Cucullaris do's Arise.
B, The First Great Foramen of the Occipital-bone, by which the Medulla Oblongata Descends out of the Cranium into the Great Cavi∣ties of all the Vertebrae.
C C, Two Depress'd Protuberancies of the Occipital-bone, which are receiv'd into the Shallow Cavities of the First Vertebrae of the Neck.
D, Two Depressures Fram'd at the Origin of the Musculi Recti Mi∣••ores of the Head.
E, A Third Foramen Appearing in the Internal Part of the Left Side of the Os Occipitis; by which the Nerve of the Ninth Pair on that Side passes out of the Cranium; that of the Right Side not Ap∣pearing in this Position of the Bone. The Second Foramen of the Os Occipitis, is Fram'd at its Conjunction with the Os Temporum, and Helps to Compose the Specus which receives the Bulbous Part of the Lateral Si?us, at the Beginning of the Internal Jugular Vein.