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Anatomy Atlases: Illustrated Encyclopedia of Human Anatomic Variation: Opus III: Nervous System: Four Variations of Ansa Hypoglossi.

Illustrated Encyclopedia of Human Anatomic Variation: Opus III: Nervous System

Four Variations of Ansa Hypoglossi.

Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD

Peer Review Status: Internally Peer Reviewed


A: Absence of descendens hypoglossi. A branch of C1 joins the hypoglossal nerve. Branches of C2, C3 join anomalous descendens vagi.

B. Absence of descendens hypoglossi. A branch from C1 joins the hypoglossal nerve. A branch from C2 joines the vagus. C3 provides the major part of descendens cervicalis along with a branch from the vagus, descendens vagi, to form ansi vagi.

C: The branch to m. thyrohyoideus departs from the ansa hypoglossi rather than being carried by and leaving from the hypoglossal nerve.

D: Absence of descendens hypoglossi. Branches from C2 and C3 join the vagus, which then provides the branches to infrahyoid muscles.

Redrawn and modified from Wimmer, A. Einige, darunter seltene Nervenvariationen des Halsgebietes. Anat. Anz. 105: 391-396, 1958.

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