. Anatomy, descriptive and applied. Anatomy. THE FRONTAL BONE 77 in the same subject. The whole surface of the bone above this part is sinootli, and covered by the aponeurosis of the Occipitofrontalis muscle. Below the frontal eminence and separated from it by a slight groove is the superciliary ridge (arcus superciliaris), broad internally, where it is continuous with the nasal eminence, but less distinct as it arches outward. These ridges are caused by the projection outward of the frontal air sinuses/ and give attachment to the Orbicularis palpebrarum and Corrugator supercilii. Between the
. Anatomy, descriptive and applied. Anatomy. THE FRONTAL BONE 77 in the same subject. The whole surface of the bone above this part is sinootli, and covered by the aponeurosis of the Occipitofrontalis muscle. Below the frontal eminence and separated from it by a slight groove is the superciliary ridge (arcus superciliaris), broad internally, where it is continuous with the nasal eminence, but less distinct as it arches outward. These ridges are caused by the projection outward of the frontal air sinuses/ and give attachment to the Orbicularis palpebrarum and Corrugator supercilii. Between the two superciliary ridges is a smooth, flat surface, the glabella. Beneath the superciliary ridge is the supraorbital arch (margo supraorbitalis), a curved and prominent margin, which forms the upper boundary of the orbit and separates the vertical fi-om the hori- zontal portion of the bone. The outer part of the arch is sharp and prominent, affording to the eye, in that sititation, considerable protection from injury;. the inner part is less prominent. At the junction of the internal and middle third of this arch is a notch, sometimes converted into a foramen, and called the supraorbital notch {incistira supraorbitalis). It transmits the supraorbital artery, vein, and nerve. A small aperture is seen in the upper part of the notch, which transmits a vein from the diploe to join the supraorbital vein. To the median side of the supraorbital notch there is often a notch (incisura frontalis) for the passage of the frontal artery and nerve. The supraorbital arch terminates externally in the external angular process and internally in the internal angular 1 Some confusion is occasioned to students commencing the study of anatomy by the name ' 'sinuses ha\ing bsen given to two perfectly different kinds of spaces connected with the sliull. It miiy be .is well, therefore, to state here, at the outset, that the "sinuses" in tne interior of the cranium which produce the grooves on
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
