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Important Landmarks of the Skull Frontal Bone It extends posteriorly to form the superior wall of orbits and most of the anterior cranial fossa (supports the frontal lobes of the brain) Contains air-filled frontal sinus Parietal Bones and Major Associated Sutures Four sutures mark the articulations of parietal bones with frontal, occipital, and temporal bones Occipital Bone Articulates with 1st vertebra Sites of attachment for the ligamentum nuchae and many neck and back muscles External occipital protuberance Foramen magnum through which the inferior part of the spinal cord exits Temporal Bone Mastoid Process tyloid Process – area for muscles/ligamentous attachment Zygomatic process External auditory meatus Sphenoid Bone Keystone bone Articulates with all other cranial bones Greater wing Lesser wing Pterygoid process Ethmoid Bone Superior part of nasal septum, roof of nasal cavities Contributes to medial wall of orbits Mandible Largest, strongest bone of face Temporomandibular joint: only freely movable joint in skull Mandibular condyle Coronoid Process Mandibular ramus Ramus of mandible Maxillary Bone Keystone bones Articulate with all other facial bones except mandible Zygomatic process Zygomatic Bones Inferolateral margins of orbits Zygomatic process articulates with the zygomatic process of the temporal bone to for the zygomatic arch Nasal Bones Form bridge of nose Lacrimal Bones Each bone houses a deep groove that helps form the lacrimal fossa which houses lacrimal sac (part of the passageway that allows tears to drain from the surface of the eye to the nasal cavity) Palatine Bones Understand and know location Vomer Understand and know location Inferior Nasal Conchae Understand and know location Orbits Bones that form the orbit (sphenoid, frontal, zygomatic, ethmoid, lacrimal, palatine, maxillary) Nasal Cavity Roof, lateral walls, and floor formed by parts of four bones o Ethmoid o Palatine bones o Maxillary bones o Inferior nasal conchae The nasal cavity is divided into Right and Left parts by the nasal septum o Nasal septum of bone and hyaline cartilage o Ethmoid o Vomer o Anterior septal cartilage