Archive image from page 155 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 122 OSTEOLOGY. either side of the foramen magnum; on their under surface they bear the condyli occipitales by means of which the skull articulates with the atlas. Of elongated oval form, the condyles are so disposed that their anterior extremities, in line with the anterior margin of the foramen magnum, lie closer together than their posterior ends, which extend as far back as the middle of the lateral borders of the foramen. Convex from before backwar
Archive image from page 155 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 122 OSTEOLOGY. either side of the foramen magnum; on their under surface they bear the condyli occipitales by means of which the skull articulates with the atlas. Of elongated oval form, the condyles are so disposed that their anterior extremities, in line with the anterior margin of the foramen magnum, lie closer together than their posterior ends, which extend as far back as the middle of the lateral borders of the foramen. Convex from before backwards, they are skewed so that their surfaces, which are nearly plane from side to side, are directed slightly laterally. Each is supported on a boss of bone, pierced by the canalis hypoglossi (hypoglossal canal), which opens obliquely from within laterally and forwards on the floor of a fossa called the fossa condyloidea, situated just lateral to the anterior part of the condyle. The canal transmits the hypo- glossal nerve, together with a meningeal branch of the ascending pharyngeal Highest nuchal line External occipital protuberance Superior nuchal line Canalis condy- loideus Jugular process- / â ~/V-'~-;- Jusrular notch. Condyle Pharyngeal tubercle Fig. 133.âThe Occipital Bone as seen from Below. artery and its companion veins. Behind the condyle is placed the fossa condyloidea, in the floor of which the canalis condyloideus (condyloid canal) frequently opens. Through this a vein passes winch joins the transverse sinus. The fossae lodge the posterior margins of the superior articular processes of the atlas in extension of the head. The edge of the foramen magnum immediately posterior to the condyle is often grooved for the passage of the vertebral artery around it. Jutting laterally from the posterior half of the condyle is a stout bar of bone, serially homologous with the vertebral transverse processâthis is the processus jugularis; deeply notched in front (jugular not
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