. Cunningham's Text-book of anatomy. Anatomy. THE OCCIPITAL BONE. 123 rectus capitis lateralis muscle. The superior aspect of the lateral part displays on either side of the foramen magnum an elevated surface of oval form, the tuberculum jugulare; this corresponds to the part of the bone which bridges over the canal lor the hypoglossal nerve. Its upper surface in many instances displays an oblique groove running across it; in this are lodged the glossopharyngeal, vagus and accessory nerves. The jugular process is deeply grooved superiorly for the lower part ol the transverse blood sinus, or si
. Cunningham's Text-book of anatomy. Anatomy. THE OCCIPITAL BONE. 123 rectus capitis lateralis muscle. The superior aspect of the lateral part displays on either side of the foramen magnum an elevated surface of oval form, the tuberculum jugulare; this corresponds to the part of the bone which bridges over the canal lor the hypoglossal nerve. Its upper surface in many instances displays an oblique groove running across it; in this are lodged the glossopharyngeal, vagus and accessory nerves. The jugular process is deeply grooved superiorly for the lower part ol the transverse blood sinus, or sigmoid sinus, which here turns round the anterior free edge of the process into the jugular foramen. Joining this, close to its medial edge, is the opening of the canalis condyloideus when it exists. The basilar part of the occipital bone extends forwards and upwards from the foramen magnum. Its anterior extremity is usually sawn across as Groove for superior sagittal sinus and falx cerebri Cerebral fossa \ Depression for confiuens sinuum ( tor- cular Herophili)' Superior angle Internal occipital protuberance Cerebellar fossa. Groove for transverse sinus an J tentorium cerebelli Lateral angle Groove for lower part of transverse sinus Jugular notch Groove for inferior petrosal sinus Internal occipital crest Jugular process Canalis condyloideus Tuberculum jugulare Basilar groove Basilar part Fig. 134.—Occipital Bone (Cerebral Surface). after adult life, it is necessary to sever it in this way from the sphenoid, the cartilage uniting the two bones having by that time become completely ossified. Broad and thin posteriorly, it narrows laterally and thickens vertically anteriorly, where on section it displays a quadrilateral form. Projecting from its inferior surface some little distance anterior to the foramen magnum is the pharyngeal tubercle to which the fibrous raphe of the pharynx is attached; on either side of this the longus capitis and rectus capitis anterior muscles are
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
