Persistent Primitive Trigeminal Arteryの一例札幌医科大学解剖学実習遺体所見記録(2)

概要

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A persistent primitive trigeminal artery was found in the left side of a 75-year-old Japanese male cadaver at Sapporo Medical College, 1990. This variant artery arises from the lateral side of the internal carotid artery in the cavernous sinus at about the first third of the carotid sulcus of the sphenoid bone. Then the artery runs backwards between the abducent and trigeminal nerves and penetrates the dura mater to enter the subarachnoid cavity. The artery sends a fine branch ventral to the pons in order to make an anastomosis with a pontine artery, and then mainly distributes to the left lateral parts of the superior and inferior semilunar lobules of the cerebellum as the lateral branch of the left superior cerebellar artery. The trigeminal artery is considered to ontogenetically have some relation to the pontine artery. It appears to be not homogeneous in origin and thus to belong to the secondary artery. Histologically, the tunica media of the variant artery is partly hypoplastic. This finding is of interest in association with mechanisms in the formation of aneurysms.
1990-12-01