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  Indian J Med Microbiol
 

Figure 1: Posteroinferior cerebellar artery segments and course. (a) inferior view. The left tonsil has been removed at the level of the tonsillar peduncle. The posteroinferior cerebellar artery originates from the posterior, medial, or posteromedial surface of the vertebral artery. Its anterior (green) and lateral (orange) medullary segments course in the cerebellomedullary cistern posteriorly toward the inferior olive and lower cranial nerves. The tonsillomedullary segment (blue) of the posteroinferior cerebellar artery, originating just distal to the emergence of lower cranial nerves from the postolivary sulcus, courses toward the inferior pole of the tonsil, forming the caudal loop, then superiorly, as it transitions into the telovelotonsillar segment (yellow), forming the rostral loop, before becoming the cortical segment (red) and coursing distally to supply branches to the posteroinferior surface of the cerebellar hemispheres. Anterior medullary segment (green); lateral medullary segment (orange); tonsillomedullary segment (blue); telovelotonsillar segment (yellow); cortical segment (red). (b) enlarged posterior view. The left and part of the right halves of the cerebellum have been removed. (c) lateral view. (d) midsagittal section. A – Artery; AICA – Anteroinferior cerebellar artery; Ant – Anterior; BA – Basilar artery; Cer – Cerebellar; Ch – Choroid; Coll – Colliculus; F – Foramen; Fiss – Fissure; He – Hemispheric; Inf – Inferior; Int – Intermediate; Lat – Lateral; Med – Medial, medullary; Mid – Middle; Nucl – Nucleus; Paramed – Paramedian; PCA – Posterior cerebral artery; Ped – Peduncle; Pl – Plexus; SCA – Superior cerebellar artery; Seg – Segment; Sup – Superior; Ton – Tonsillar; Tr – Trunk; VA – Vertebral artery; Ve – Vermian; Vel – Velum. Modified with permission from Figure 2.15 of Rhoton, 2000[3]

Figure 1: Posteroinferior cerebellar artery segments and course. (a) inferior view. The left tonsil has been removed at the level of the tonsillar peduncle. The posteroinferior cerebellar artery originates from the posterior, medial, or posteromedial surface of the vertebral artery. Its anterior (green) and lateral (orange) medullary segments course in the cerebellomedullary cistern posteriorly toward the inferior olive and lower cranial nerves. The tonsillomedullary segment (blue) of the posteroinferior cerebellar artery, originating just distal to the emergence of lower cranial nerves from the postolivary sulcus, courses toward the inferior pole of the tonsil, forming the caudal loop, then superiorly, as it transitions into the telovelotonsillar segment (yellow), forming the rostral loop, before becoming the cortical segment (red) and coursing distally to supply branches to the posteroinferior surface of the cerebellar hemispheres. Anterior medullary segment (green); lateral medullary segment (orange); tonsillomedullary segment (blue); telovelotonsillar segment (yellow); cortical segment (red). (b) enlarged posterior view. The left and part of the right halves of the cerebellum have been removed. (c) lateral view. (d) midsagittal section. A – Artery; AICA – Anteroinferior cerebellar artery; Ant – Anterior; BA – Basilar artery; Cer – Cerebellar; Ch – Choroid; Coll – Colliculus; F – Foramen; Fiss – Fissure; He – Hemispheric; Inf – Inferior; Int – Intermediate; Lat – Lateral; Med – Medial, medullary; Mid – Middle; Nucl – Nucleus; Paramed – Paramedian; PCA – Posterior cerebral artery; Ped – Peduncle; Pl – Plexus; SCA – Superior cerebellar artery; Seg – Segment; Sup – Superior; Ton – Tonsillar; Tr – Trunk; VA – Vertebral artery; Ve – Vermian; Vel – Velum. Modified with permission from Figure 2.15 of Rhoton, 2000<sup>[3]</sup>