. Bulletin. Science; Natural history; Natural history. 64 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. 1. Geomyid carotid arteries based on Thomomys. ventral view. CC = coinmon carotid, EC = external carotid, EM = external maxillary, lA = inferior alveolar. IC = internal carotid, IM = internal maxillary, MA = masseteric artery, MLF = middle lacerate foramen, OR = orbital portion of the internal maxillary. PA = posterior auricular. PT = pterygoid portion of the internal maxillary, ST = superficial temporal. giving rise to the internal maxillary, giving off small nutritive branches to the masse
. Bulletin. Science; Natural history; Natural history. 64 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. 1. Geomyid carotid arteries based on Thomomys. ventral view. CC = coinmon carotid, EC = external carotid, EM = external maxillary, lA = inferior alveolar. IC = internal carotid, IM = internal maxillary, MA = masseteric artery, MLF = middle lacerate foramen, OR = orbital portion of the internal maxillary. PA = posterior auricular. PT = pterygoid portion of the internal maxillary, ST = superficial temporal. giving rise to the internal maxillary, giving off small nutritive branches to the masseter musculature and the glands and muscles of the throat. In the region of the ear the external carotid divides into its usual terminal branches, the anterior and posterior auricular arteries and the superficial temporal artery. The Circle of WilHs differs slightly between the three genera dissected (Fig. 2). In Pappogeomys the internal carotid receives no connection from the basilar artery through the superior cerebral artery. In both Geoinys and Thomomys a posterior communicating artery is present, connecting directly to the internal carotid in Geomys and to the posterior cerebral artery in Thomomys. In both cases, however, the posterior communicating artery is very small and unimpor- tant in cranial circulation. During embryonic development in rodents the internal carotid artery enters the skull through the posterior lacerate foramen, a slit-like opening on the medial side of the bulla, between the basioccipital and basisphenoid bones. With further os- sification this foramen may close, with opening remaining only where vessels or nerves pass through this fissure. The opening for the jugular foramen, when. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles
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