Accessory Hemiazygos Vein - Structure

Structure

The accessory hemiazygos vein varies inversely in size with the left superior intercostal vein.

It receives the posterior intercostal veins from the 4th, 5th, 6th, and 7th intercostal spaces between the left superior intercostal vein and highest tributary of the hemiazygos vein; the left bronchial vein sometimes opens into it.

It either crosses the body of the eighth thoracic vertebra to join the azygos vein or ends in the hemiazygos.

When this vein is small, or altogether absent, the left superior intercostal vein may extend as low as the fifth or sixth intercostal space.

Veins of the thorax and vertebral column (TA A12.3.01–04, 07, GA 7.664)
Thorax
Coronary
Coronary sinus Great cardiac (Left marginal) · Posterior of the left ventricle · Oblique of the left atrium (Ligament of the left vena cava) · Middle cardiac
Small cardiac vein Anterior cardiac (Right marginal)
Smallest cardiac veins Right atrial veins · Right ventricular veins
Pulmonary right inferior pulmonary vein · right superior pulmonary vein · left inferior pulmonary vein · left superior pulmonary vein
SVC
Brachiocephalic internal thoracic (anterior intercostal, superior epigastric, Kacheshmarova's vein (vena xiphia (vena africana))) · left superior intercostal · supreme · vertebral · subclavian (axillary: lateral thoracic, thoracoepigastric, dorsal scapular, external jugular) · pericardiacophrenic · internal jugular
Azygos right superior intercostal · bronchial · intercostal/posterior intercostal 5-11 · accessory hemiazygos/hemiazygos · superior phrenic
Striolae striola luteola · striola aureola · striola rubella
Vertebral column vertebral venous plexuses (external, internal) · spinal (posterior, anterior) · basivertebral · intervertebral

M: VAS

anat (a:h/u/t/a/l,v:h/u/t/a/l)/phys/devp/cell/prot

noco/syva/cong/lyvd/tumr, sysi/epon, injr

proc, drug (C2s+n/3/4/5/7/8/9)

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