There are five bones that make up the base of the skull: Ethmoid bone Sphenoid bone Occipital bone Frontal bone Temporal bone Sinuses: Occipital sinus Superior sagittal sinus Superior petrosal sinus Foramina of the skull: Foramen cecum Optic foramen Foramen lacerum Foramen rotundum Foramen magnum Foramen ovale Jugular foramen Internal auditory meatus Mastoid foramen Sphenoidal emissary foramen Foramen spinosum Sutures: Frontoethmoidal suture Sphenofrontal suture Sphenopetrosal suture Sphenoethmoidal suture Petrosquamous suture Sphenosquamosal suture.
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