Left Pulmonary Arteries

Unlike the right upper lobe, the left upper lobe artery arches over the top of the left upper lobe bronchus, which therefore is ''hyparterial.'' Apart from this

Figure 1 (Continued) (B) The posterior segmental artery, LUL. (C) Apical and posterior segmental arteries, RUL, arise from an upper division of the truncus anterior (above the takeoff of the anterior segmental branch), while the anterior segmental artery, LUL, arises independently from the pars anterior.

Figure 1 (Continued) (B) The posterior segmental artery, LUL. (C) Apical and posterior segmental arteries, RUL, arise from an upper division of the truncus anterior (above the takeoff of the anterior segmental branch), while the anterior segmental artery, LUL, arises independently from the pars anterior.

Figure 1 (Continued) (D) The anterior segment artery, RUL. (E) The superior segment artery, LLL. This is more commonly single than double and almost always arises above the lingular artery(-ies).

Figure 1 (Continued) (F) Segmental branches of the lingular artery. This artery most commonly arises as a single vessel from the interlobar portion of the left pulmonary artery. (G) Right middle lobe artery and the superior segment artery, RLL. The middle lobe artery usually arises immediately above the superior segmental artery but may arise at the same level or below.

Figure 1 (Continued) (F) Segmental branches of the lingular artery. This artery most commonly arises as a single vessel from the interlobar portion of the left pulmonary artery. (G) Right middle lobe artery and the superior segment artery, RLL. The middle lobe artery usually arises immediately above the superior segmental artery but may arise at the same level or below.

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Figure 1 (Continued) (H) Medial and lateral segmental arteries, RML. These frequently do not follow the bronchial pattern but cross segmental planes. On each side a basal artery (basal trunk, or pars basalis) supplies the basal segmental vessels. (I) The anteromedial basal segmental artery, LLL. This is usually a common trunk, like the left anteromedial basal segmental bronchus.

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