Figure 3 in New data on the braincase of the aetosaurian archosaur (Reptilia: Diapsida) Stagonolepis robertsoni Agassiz

Figure 3. Stagonolepis robertsoni Agassiz. Medial view of left side of braincase of MCZD 2-4. The specimen has been longitudinally fractured close to the midline, revealing the cultriform process of the parabasisphenoid and the left side of the endocranial cavity. Areas of matrix are indicated by hatching. Anterior is to the top of the figure. For scale see Fig. 1. cp = cultriform process of parabasisphenoid; ec = endocranial cavity; g = groove; hf = hypophyseal fossa; ica = path of cerebral branch of internal carotid artery into hf; l.bpt = left basipterygoid process; l.btbs = left basal tuber of parabasisphenoid; l.ls = left laterosphenoid; l.vrop = left ventral ramus of the opisthotic; mpr = median pharyngeal recess; oa = foramen, possibly for orbital artery; pbs = prow of parabasisphenoid; V = position of foramen for trigeminal nerve; VI = position of path through floor of ec for abducens nerve; VII = position of depression, possibly leading to foramen for passage of facial nerve.