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Superior Posterior Mediastinum, Superior & Posterior Mediastinum ???? Fetal circulation L. umb vein->ductus venosus-> R/L atrium due to for. ovalis-> R/L ventricles->pulm. trunk&aorta shunted by ductus arteriosus-> little to lungs, most to body, Superior ???? Contents: Internal jug. v subclavian v. merge to form brachiocephalic v at 'venous angles' -lymphatic drainage right steeper than left left shunted to right, Through diaphragm 3 hiatuses IVC-T8 Esop-T10 w/ vag. trunks Aorta-T12 w/ azy/thor. duct ???? Esophageal Hiatal Hernia stomach up thru eso. hia. GERD='heartburn' near heart, feels like MI, Superior & Posterior Mediastinum ???? Boundaries central thorax, b/w lungs covered by mediast. par. pleura stern. angle to T4/T5-trans.thor. plane above is sup, below is A/mid/P top of pericardium, bifurc of trachea, 4 Nerve Plexus 2 ANS cardiac plexi deep-bifurc of trach sup.-on aortic arch both contain parasym (vagus) and sympa from chain Pulmonary plexus at pulm.aa with vagal and SNS fibers Esophageal plexus w/ vag, SNS ???? Vagus Nerve (CN X) R recurrent laryngeal br around rt. subclavian L rec. laryn. around aorta post. to lig. art. & lung root both nerves motor to larynx (both aa. devel. from 4th arch) continues as esoph. plexus L to ant, R to post esoph., Thymus within sup./ant. involuted in adults T-lymphocyte maturation ???? Great Vessels SVC-formed by R/L BSVs Right side of aorta Arch of aorta & branches Rt-brachiocephalic trunk -r. common carotid, r. subclav. Left-l. common carotid, l. subclav Brachiceph most ant, l. sub most post, Contents: Internal jug. v subclavian v. merge to form brachiocephalic v at 'venous angles' -lymphatic drainage right steeper than left left shunted to right ???? Thymus within sup./ant. involuted in adults T-lymphocyte maturation, Superior ???? Boundaries: vert. T1 to trans. thor plane includes thor. outlet, Great Vessels SVC-formed by R/L BSVs Right side of aorta Arch of aorta & branches Rt-brachiocephalic trunk -r. common carotid, r. subclav. Left-l. common carotid, l. subclav Brachiceph most ant, l. sub most post ???? Ligamentum Arteriosum L. pulm. a to arch aorta embryo-ductus art. shunted blood from lesser to greater circ., Superior ???? 4 Nerve Plexus 2 ANS cardiac plexi deep-bifurc of trach sup.-on aortic arch both contain parasym (vagus) and sympa from chain Pulmonary plexus at pulm.aa with vagal and SNS fibers Esophageal plexus w/ vag, SNS