Volume 1

Hand atlas of human anatomy / by Werner Spalteholz.

  • Werner Spalteholz
Date:
[1930?]
Catalogue details

Licence: Public Domain Mark

Credit: Hand atlas of human anatomy / by Werner Spalteholz. Source: Wellcome Collection.

    11/266 page 5
    5. Occipital bone, OS occipitale, viewed from the right side. (The direction does not correspond to that of the bone when the skull is in its ordinary position.) The squama occipitalis (see also Figs. 3, 4, 57, 58 and 61—68) is curved so as to be convex bachward in the sagittal and transverse direction. Its anterior border forms in the centre the posterior periphery of the foramen occipitale magnum; the free lateral and superior borders meet in the median plane, forming an obtuse angle, the lower portion of each lateral border being slightly serrated as the continuation of the margo mcistoideus (p. 4); the upper portion of this border is deeply and multiply serrated and is known as the margo lambdoideus for union with the occipital margin of the parietal bone (sutura lambdoidea). Projecting from the middle of the posterior surface is seen the external occipital protuberance (protuberantia occipitalis externa). Extending lateralward from this protuberance on each side are the superior nuchal lines (lineae nuchae superiores), convex upward, and above these the less constant su¬ preme nuchal lines (lineae nuchae supremae). In the median plane, extending toward the fora¬ men magnum, is seen the external occipital crest (crista occipitalis externa) which gives attach¬ ment to the ligamentum nuchae. From about the middle of the crest extend lateralward the two inferior nuchal lines (lineae nuchae inferiores), also convex upward. The area for the m. occipitalis above the external protuberance and the supreme nuchal lines is called the occipital plain (planum occipitale), while that below the same is designated the nuchal plain (planum nuchale) and gives attachment to the mm. trapezius, sternocleidomastoideus, splenius capitis, semispinalis capitis, obliquus capitis superior, recti capitis posteriores. On the anterior surface of the bone at the middle point of the eminentia cruciata (approximately at the height of the protuberantia externa) is seen the internal occipital protuberance or protuberantia occipitalis interna (for the confluens sinuum; falx cerebri, and tentorium cerebelli). From the internal protuberance arise three well marked grooves: one in the median line passes upward, the sulcus sagittalis (0. T. superior longitudinal sulcus) for the sinus sagittalis superior and the falx cerebri: and one lateralward on each side, the sulcus transversus (for the sinus transversus; tentorium cerebelli) Of the two transverse sulci the right is usually wider than the left and it alone is continuous with the sulcus sagittalis. A fourth groove or (more often) ridge extends to the foramen magnum and receives the sinus occipitalis. The anterior surface presents variable' marked ledges resembling cerebral sulci, juga cerebralia and cerebellaria, and furrows resembling cerebral windings, impressiones digitatae. The lower depressions help to form the posterior skull fossa.
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    No text description is available for this image
    No text description is available for this image