Figure 2 in Jurassic mammaliaform petrosals from Western Siberia (Russia) and implications for early mammalian inner-ear anatomy

Figure 2. Detailed anatomy of the lateral trough area of three right petrosals based on virtual 3D surface models. A,?haramiyidan petrosal PIN 5087/37 ventrolateral view; B,?haramiyidan petrosal PIN 5087/37 lateral view; C,?haramiyidan petrosal PIN 5087/69 ventrolateral view; in comparison to: D,?docodontan petrosal PIN 5087/38 ventrolateral view; E,?docodontan petrosal PIN 5087/38 lateral view. Anterior to the top. Scalebars equal 1 mm. Red areas mark broken edges of the lateral flange. Abbreviations: atcsf, foramen leading to anterior transcochlear [= 'epicochlear' of Harper & Rougier (2019)] sinus; cep, cavum epiptericum; ci, crista interfenestralis; cp, crista parotica; csc, cavum supracochleare; fc, facial canal; fv, fenestra vestibuli; hF, hiatus Fallopii; jn, jugular notch; lf, lateral flange; mpr, mastoid pneumatic recess; poc, prootic canal; ppr, paroccipital pneumatic recess; ptcsf, foramen leading to posterior transcochlear [= 'epicochlear' of Harper & Rougier (2019)] sinus; ptf, pterygoparoccipital foramen; sff, secondary facial foramen; sirsa, sulcus for inferior ramus of stapedial artery; slhv, sulcus for the lateral head vein; smf, stapedius muscle fossa; vf atcs, vascular foramen for venous vessel connecting to the anterior transcochlear sinus.