A manual of anatomy . spondingjugular process and they articulate with the mastoid portion of thetemporal bone. THE OCCIPITAL BONE 47 The lateral, or exoccipital parts bound the foramen magnum later-ally. The inferior surface of each bears a large condyle which servesfor articulation with the atlas of the vertebral column. Each con-dyle is oval or reniform and obliquely placed; the articular surfaceis convex dorsoventrally and flattened from side to side and facesdownward and a little laterally. Each is raised from the main massof the exoccipital and this supporting mass is pierced by the hypo
A manual of anatomy . spondingjugular process and they articulate with the mastoid portion of thetemporal bone. THE OCCIPITAL BONE 47 The lateral, or exoccipital parts bound the foramen magnum later-ally. The inferior surface of each bears a large condyle which servesfor articulation with the atlas of the vertebral column. Each con-dyle is oval or reniform and obliquely placed; the articular surfaceis convex dorsoventrally and flattened from side to side and facesdownward and a little laterally. Each is raised from the main massof the exoccipital and this supporting mass is pierced by the hypo-glossal canal {canalis hypoglossi) which transmits the hypoglossalnerve, the meningeal branch of the ascending pharyngeal artery andits accompanying vein. The canal terminates laterally at the ven-tral side of the condyle. Dorsal to the condyle is the condyloid fossa Sagittal groove Lambdoid border \ Superior occipital^^ fossa Transverse groove - Internal occipitalprotuberance Internal occipital crest Jugular process. Inferior occipital fossa Mastoid border Occipital condyle Condyloid canal(sigirord groove) — Jugular tubercle - Hypoglossal canal Basilar portion + Pig. 25. —The occipital bone seen from in front (cerebral surface).McMurrich.) (Sobotta and (fossa condyloidea) that may continue through the bone as the con-dyloid canal {canalis condyloideus). Projecting from the bone atthe side of each condyle is the jugular process (processus jugularis)which is notched ventrally to assist in forming the jugular cerebral surface of the exoccipital is smooth but uneven, exhibit-ing a projection, the jugtdar tubercle (tuberculum jugulare) at the sideof the foramen magnum. This is just over the orifice of the hypo-glossal canal and it may be grooved for the glossopharyngeal, vagaland accessory nerves. The basilar portion forms the ventral boundary of the foramenmagnum and extends to the sphenoid bone; to this it is attached by afirm osseous union. Its inferior surface
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthumananatomy, bookyea
