![]() ![]() openings for the frontal sinuses on either side of the nasal process each frontal sinus communicates with the ipsilateral middle nasal meatus via a frontonasal duct.Superior surface of the horizontal portion is convex and contains depressions for cerebral convolutions. fovea trochlearis / trochlear spine near nasal part, for attachment of cartilaginous pulley for superior oblique muscle.lacrimal fossa: lateral shallow depression for lacrimal gland.Inferior surface of the horizontal portion is smooth and concave. The horizontal portion is composed of two thin, orbital plates separated by the ethmoidal notch. groove for anterior meningeal artery (branch of anterior ethmoidal artery).foramen cecum: small notch, converted into foramen, emissary vein from nose.frontal crest: ridge, formed from edges of sulcus that gives attachment to the falx cerebri.sagittal sulcus: vertical groove for the superior sagittal sinus.Internal surface of the vertical portion features: nasal part features the nasal notch, nasion (middle of frontonasal suture), and nasal process (sharp spine, forms part of nasal septum).upper and lower temporal lines run backwards and are the sites of attachment for the temporalis fascia and temporalis muscle, respectively.supratrochlear notch/foramen containing the supratrochlear nerve and vessels.supraorbital notch/foramen containing the supraorbital nerve and vessels.superciliary arches which join to form the glabella.horizontal portion (orbital): has superior/inferior surfacesĮxternal surface of the vertical portion features:.vertical portion (squama): has external/internal surfaces. ![]()
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