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  Indian J Med Microbiol
 

Figure 6: (a) A union of left subclavian vein and left internal jugular vein is seen. This union lies in the cervical part of mediastinum anterior to cupola. The left subclavian vein arches upward and reaches almost to the lower boundary of the supraclavicular triangle. The area above the subclavian vein can be considered as supraclavicular triangle whereas the internal jugular vein enters the carotid sheath within the carotid triangle. The orange line indicates the outer border of internal jugular vein and yellow line indicates the upper border of the left subclavian vein. (b) The left subclavian artery arises from the arch of the aorta, behind the left common carotid, at the level of the fourth thoracic vertebra (orange dotted line). The scalenus anterior muscle (yellow arrow) divides this artery into three parts. The first portion extends from the origin of the vessel to the medial border of the scalenus anterior and ascends in the superior mediastinal cavity to the root of the neck (yellow dotted line). The second portion of the subclavian artery lies behind the scalenus anterior; it is very short and forms the highest part of the arch. The second part lies behind this muscle after arching laterally (blue dotted line). The left brachiocephalic vein is seen in this image (left brachiocephalic vein) below and front of the artery and is separated from it by the scalenus anterior. The third part of subclavian artery extends from the lateral margin of the scalenus muscle to the outer border of the first rib, where it becomes the axillary artery and is not seen in this image. A lymph node belonging to Station 3a of International Association of Study of Lung Cancer classification is seen lying in the left supraclavicular triangle of neck which is the smaller and lower triangle of posterior triangle. (c) The retrotracheal space is seen in this figure, and the origin of left common carotid artery from aorta is seen. The union of the left brachiocephalic vein with left subclavian vein is also seen. The lower jugular group of the lymph node is seen. The thoracic duct is seen and the presence of color is due to partial reflux of blood into the duct at the point of union. (d) A lymph node is seen in the lowermost part of supraclavicular fossa belonging to lower jugular group, i.e., Level IV (AJCC). LCC: Left common carotid; LBCV: Left brachiocephalic vein; IJV: Internal jugular vein; LSCV: Left subclavian vein; LN: Lymph node

Figure 6: (a) A union of left subclavian vein and left internal jugular vein is seen. This union lies in the cervical part of mediastinum anterior to cupola. The left subclavian vein arches upward and reaches almost to the lower boundary of the supraclavicular triangle. The area above the subclavian vein can be considered as supraclavicular triangle whereas the internal jugular vein enters the carotid sheath within the carotid triangle. The orange line indicates the outer border of internal jugular vein and yellow line indicates the upper border of the left subclavian vein. (b) The left subclavian artery arises from the arch of the aorta, behind the left common carotid, at the level of the fourth thoracic vertebra (orange dotted line). The scalenus anterior muscle (yellow arrow) divides this artery into three parts. The first portion extends from the origin of the vessel to the medial border of the scalenus anterior and ascends in the superior mediastinal cavity to the root of the neck (yellow dotted line). The second portion of the subclavian artery lies behind the scalenus anterior; it is very short and forms the highest part of the arch. The second part lies behind this muscle after arching laterally (blue dotted line). The left brachiocephalic vein is seen in this image (left brachiocephalic vein) below and front of the artery and is separated from it by the scalenus anterior. The third part of subclavian artery extends from the lateral margin of the scalenus muscle to the outer border of the first rib, where it becomes the axillary artery and is not seen in this image. A lymph node belonging to Station 3a of International Association of Study of Lung Cancer classification is seen lying in the left supraclavicular triangle of neck which is the smaller and lower triangle of posterior triangle. (c) The retrotracheal space is seen in this figure, and the origin of left common carotid artery from aorta is seen. The union of the left brachiocephalic vein with left subclavian vein is also seen. The lower jugular group of the lymph node is seen. The thoracic duct is seen and the presence of color is due to partial reflux of blood into the duct at the point of union. (d) A lymph node is seen in the lowermost part of supraclavicular fossa belonging to lower jugular group, i.e., Level IV (AJCC). LCC: Left common carotid; LBCV: Left brachiocephalic vein; IJV: Internal jugular vein; LSCV: Left subclavian vein; LN: Lymph node