Os occipitale

Pars basilaris

            Clivus

            Sulcus sinus petrosi inferioris (2)

            Tuberculum pharyngeum

Pars lateralis

            Incisura jugularis

            Sulcus sinus sigmoidei

            Condylus occipitalis

            Canalis condylaris

            Canalis nervi hypoglossi(in front on condylus)

Squama occipitalis

            Protuberantia occipitalis interna

            Sulcus sinus occipitalis

            Sulcus sinus sagittalis superioris

            Sulcus sinus transversi (2)

            Protuberantia occipitalis externa

            Crista ocipitalis externa

            Linea nuchalis superior (2)

            Linea nuchalis inferior

Sometimes squama occipitalis upper part is divided with suture creating os incae.