. Cunningham's Text-book of anatomy. Anatomy. THE STEEXUM. 107 Incisura jugularis Clavicular facet. Manubrium Rib cartilage the manubrium or handle; the corpus sterni or body; aud the processus xiphoideus (or xiphoid cartilage). Qf these the body is formed by the fusion in early life of four segments or sternebrse. The manubrium or superior part, usually separate throughout life from the rest of the bone, though occasionally fused with it, is of a flattened triangular form. The anterior surface, slightly saddle-shaped, affords attachment to the fibres of the pectoralis major and sterno-mastoid
. Cunningham's Text-book of anatomy. Anatomy. THE STEEXUM. 107 Incisura jugularis Clavicular facet. Manubrium Rib cartilage the manubrium or handle; the corpus sterni or body; aud the processus xiphoideus (or xiphoid cartilage). Qf these the body is formed by the fusion in early life of four segments or sternebrse. The manubrium or superior part, usually separate throughout life from the rest of the bone, though occasionally fused with it, is of a flattened triangular form. The anterior surface, slightly saddle-shaped, affords attachment to the fibres of the pectoralis major and sterno-mastoid muscles. It is bounded above by a thick border, the lateral parts of which are hollowed out obliquely to form the facets (incisurae claviculares) for the sternal ends of the clavicles; around the facets, which have an upward, lateral, and slightly backward direction, the bone is faintly lipped. In the interval between these two facets there is a slight notch (incisura jugularis) which forms the floor of the characteristic hollow seen at the root of the neck anteriorly—the supra- sternal notch. The lateral borders are excavated immediately below the clavi- cular facets for the reception of the cartilages of the first ribs. Below this, the margin of the bone slopes medially, and is sharp, except inferiorly, where it presents a facet which supports a part of the second costal cartilage. Around this the bone is usually lipped anteriorly. The upper angles correspond to the ridge separating the clavicular facets from the first costal facets : whilst the lower angle, which may be regarded as cut across trans- versely, forms the surface which is united by cartilage to the body of the sternum. The anterior edge of this surface is usually prominent. The posterior aspect of the manubrium is smoother than the anterior, is pierced by numerous foramina, and is slightly concave from side to side and above downwards. Here are attached some of the fibres of the sterno-hyoid and sterno-thyreo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
