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VEINS. Venae. Thin-walled blood vessels which 24 return blood to the heart (atrium). PULMONARY VEINS. Venae pulmonales. Veins leading from the lungs to the heart. The two superior right pulmonary veins. [[Venae pulmonales dextrae]]. Occasionally unite to form a single trunk. A B Superior right pulmonary vein. V. pulmonalis dextra superior. Returns blood from the upper and middle lobes. A B

Apical branch. Ramus apicalis. Returns blood from the apical segment of the upper lobe. A Intrasegmental part. Pars intrasegmentalis. Twig from the apical segment of the upper lobe. A

Intersegmental part. Pars intersegmentalis. Twig situated between the apical and posterior segments of the upper lobe. A Anterior branch. Ramus anterior. Branch from the anterior segment of the upper lobe. Intrasegmental part. Pars intrasegmentalis. Twig from the anterior segment. Intersegmental part. Pars intersegmentalis. Twig that courses between the anterior and lateral segments. A

Posterior branch. Ramus posterior. Branch that drains the posterior segment of upper lobe. A Infralobar part. Pars infralobaris. Twig from the posterior segment. A Intralobar part. Pars intralobaris [inter-segmentalis]. Twig lying between the posterior segment of the upper lobe and the apical (superior) segment of the lower lobe. A Middle lobe branch. Ramus lobi medii. A Lateral part. Pars lateralis. Twig from the lateral segment of the middle lobe. A Medial part. Pars medialis. Twig from the medial segment of the middle lobe. A Inferior right pulmonary vein. V. pulmonalis dextra inferior. Returns blood from the right lower lobe. A B

Superior branch. Ramus superior. Returns blood from the apical (superior) segment of the lower lobe. A

Intrasegmental part. Pars intrasegmentalis. Drains the apical segment of the lower lobe. Intersegmental part. Pars intersegmentalis. Twig between the apical and posterior basal segments of the lower lobe. A Common basal vein. V. basalis communis. Common vein from the basal pulmonary segments. A

Superior basal vein. V. basalis superior. Vein that drains the lateral and anterior basal segments. A

Anterior basal root. Radix basalis anterior. Vein from the anterior and part of the lateral basal segments. A

Intrasegmental part. Pars intrasegmentalis. Twig from the anterior basal segment. A

Intersegmental part. Pars intersegmental. Twig between the anterior and lateral basal segments. A

Inferior basal segment. V. basalis inferior. Vein from the posterior basal segment. A

Left superior pulmonary veins. Vv. pulmonalis sinistra superior. The two left pulmonary veins that occasionally unite to form a single trunk. B

Left superior pulmonary vein. V. pulmonalis sinistra superior. Returns blood from the left upper lobe. B C

Apicoposterior branch. Ramus apicoposterior. Drains the apicoposterior segment. C

Intrasegmental part. Pars intrasegmentalis. Twig from the apicoposterior segment. C

Intersegmental part. Pars intersegmentalis. Twig between the apicoposterior and anterior segments. C

Anterior branch. Ramus anterior. Branch from the anterior segment. C Intrasegmental part. Pars intrasegmentalis. Twig from the anterior segment. C

Intersegmental part. Pars intersegmentalis. Twig between the anterior and superior lingu-lar segments. C

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