. Human embryology and morphology. Embryology, Human; Morphology. supra-occip. Fig. 134. Fig. 133.—The Parachordal Cartilages out of which the Cartilaginous Parts of the Occipital Bone are formed. Fig. 134.—The expansion backwards of the Parachordal Cartilages to enclose the Foramen Magnum and form the Supra-occipital. these four pieces until the fourth year, when synostosis occurs. The occipital condyles are formed from the exoccipitals and basi- occipital, the exoccipital element constituting by far the larger part. The anterior condylar foramen is formed between these two parts. The occipit
. Human embryology and morphology. Embryology, Human; Morphology. supra-occip. Fig. 134. Fig. 133.—The Parachordal Cartilages out of which the Cartilaginous Parts of the Occipital Bone are formed. Fig. 134.—The expansion backwards of the Parachordal Cartilages to enclose the Foramen Magnum and form the Supra-occipital. these four pieces until the fourth year, when synostosis occurs. The occipital condyles are formed from the exoccipitals and basi- occipital, the exoccipital element constituting by far the larger part. The anterior condylar foramen is formed between these two parts. The occipital protuberance is formed by both membranous and cartilaginous parts of the supra-occipital. (2) The Petro-mastoid forms part of the base of the skull. We have already seen that the petro-mastoid part of the temporal bone is developed out of the cartilage which forms the periotic capsule (Figs. 35, p. 50, and 135). The periotic cartilages fuse at points with the parachordal, which form the basis of the occipital bone. Even to a late stage (30th year or later) remnants of these cartilages may be found between the petro- mastoid and occipital bones, especially between the jugular process of the occipital and the mastoid (Fig. 136). The fibro- cartilage in the foramen lacerum medium is a remnant of the periotic cartilaginous capsule. (See also p. 58.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Keith, Arthur, Sir, 1866-1955. London : E. Arnold
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