<P> The phrenic nerve descends obliquely with the internal jugular vein across the anterior scalene, deep to the prevertebral layer of deep cervical fascia and the transverse cervical and suprascapular arteries . On the left, the phrenic nerve crosses anterior to the first part of the subclavian artery . On the right, it lies on the anterior scalene muscle and crosses anterior to the 2nd part of the subclavian artery . On both sides, the phrenic nerve runs posterior to the subclavian vein as it enters the thorax where it runs anterior to the root of the lung and between the fibrous pericardium and mediastinal face of the parietal pleura . </P> <P> Found in the middle mediastinum, both phrenic nerves run from C3, C4, and C5 along the anterior scalene muscle deep to the carotid sheath . </P> <Ul> <Li> The right phrenic nerve passes over the brachiocephalic artery, posterior to the subclavian vein, and then crosses the root of the right lung anteriorly and then leaves the thorax by passing through the vena cava hiatus opening in the diaphragm at the level of T8 . The right phrenic nerve passes over the right atrium . </Li> <Li> The left phrenic nerve passes over the pericardium of the left ventricle and pierces the diaphragm separately . </Li> </Ul> <Li> The right phrenic nerve passes over the brachiocephalic artery, posterior to the subclavian vein, and then crosses the root of the right lung anteriorly and then leaves the thorax by passing through the vena cava hiatus opening in the diaphragm at the level of T8 . The right phrenic nerve passes over the right atrium . </Li>

Where does the phrenic nerve enter the diaphragm
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