A manual of anatomy . radial notch {incisura radialis) is at the lateral margin of thecoronoid process. It is concave dorsoventrally and comparativelysmall, accommodating the head of the radius. Medially it joinsthe semilunar notch and all of its other margins serve for attachmentof ligaments. The shaft {corpus ulnce) is tapering and its distal extremity isslightly ciirved, laterally. It presents three surfaces and threemargins. The ventral, or volar surface, is smooth and concavo-convex. It affords origin for the mm. supinator, flexor digitorum THE ULNA 51 profundus, pronator teres and pronat
A manual of anatomy . radial notch {incisura radialis) is at the lateral margin of thecoronoid process. It is concave dorsoventrally and comparativelysmall, accommodating the head of the radius. Medially it joinsthe semilunar notch and all of its other margins serve for attachmentof ligaments. The shaft {corpus ulnce) is tapering and its distal extremity isslightly ciirved, laterally. It presents three surfaces and threemargins. The ventral, or volar surface, is smooth and concavo-convex. It affords origin for the mm. supinator, flexor digitorum THE ULNA 51 profundus, pronator teres and pronator quadratus (from abovedownward). The medial surface is smooth and not sharply definedfrom the ventral surface; it affords origin to the m. flexor digitorumprofundus and is often described with the ventral surface. Thedorsal surface is quite well defined and faces somewhat laterally. ?.^=>io ff Coronoid j iSB process Coronoidprocess Semilunarnotch -Radial notch Dorsal borderInternal surface Dorsal surface i>. Articular circumference Styloid process Fig. s6.—The left ulna seen from be-hind. (Sobotta and McMiirrich.) Styloid process Fig. 57.—The left ulna seen from infront. {Sobotta and McMiirrich.) It is smooth and concave in its proximal two-thirds and the distalportion is rounded and not sharply separated from the medialsurface. Its proximal portion affords origin to the mm. anconeusand then in order (but along its lateral margin) the abductor pollicislongus, extensor polhcis longus and extensor indicis proprius, 6 82 OSTEOLOGY The ventral, or volar margin is rounded extending from the tuber-osity to the styloid process and affords origin to the m. flexor digito-rum profundus. The dorsal margin (margo dorsalis) is sharp andsubcutaneous. To it is attached the aponeurosis of the mm. flexorcarpi ulnaris, extensor carpi ulnaris and flexor digitorum lateral margin, or interosseous crest {crista interossei), is sharpand well defined in its proximal three-fou
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthumananatomy, bookyea
