Respiratory System Blood Supply.docx

RESPIRATORY SYSTEM BLOOD SUPPLY Red= oxygenated Blue= deoxygenated Location Blood Supply and Drainage Tongue Supply Lingual artery (branches off external carotid) Nasal Cavity Supply Sphenopalatine artery Ethmoidal arteries Greater palatine artery Facial artery (labial artery is a branch of the faci...

RESPIRATORY SYSTEM BLOOD SUPPLY Red= oxygenated Blue= deoxygenated Location Blood Supply and Drainage Tongue Supply Lingual artery (branches off external carotid) Nasal Cavity Supply Sphenopalatine artery Ethmoidal arteries Greater palatine artery Facial artery (labial artery is a branch of the facial) Kiesselbach’s area (plexus) Region of anteroinferior nasal septum where branches of each of the above arteries anastomose Common site of chronic epistaxis Drainage A submucosal venous plexus deep to the nasal mucosa provides venous drainage of the nose and into the cavernous dural venous sinus The triangle from the upper lip to the bridge of the nose is the “danger area” of the face Larynx Supply Branches of superior/inferior thyroid arteries Drainage Internal jugular Trachea Supply Brachiocephalic trunk inferior thyroid arteries bronchial arteries and intercostal arteries Drainage Bronchial veins and intercostal veins inferior thyroid vein left brachiocephalic Parietal Pleura Supply Internal thoracic arteries (AKA internal mammary) Intercostal arteries Musculophrenic arteries Drainage Intercostal veins Internal thoracic veins Visceral Pleura Supply Bronchial arteries branching off aorta Drainage Pulmonary veins LA Lung Stroma (main/ primary bronchi) Supply Bronchial arteries 2 left bronchial arteries usually arise from the descending/ thoracic aorta 1 single right bronchial artery from the aorta * common variation= right bronchial artery arises indirectly from an upper posterior intercostal artery or left bronchial Systemic pressures Drainage Bronchial veins drain the proximal part of the root of the lung R bronchial vein Azygos vein SVC RA L bronchial vein Accessory hemi-azygos vein Azygos vein SVC RA Bronchial veins exit the lungs at the hilum Lung Stroma (secondary/ lobar bronchi terminal bronchiole) Supply Bronchial arteries Arise from the aorta and intercostal arteries Deliver oxygenated blood at systemic pressures Supply intrapulmonary structures proximal to the terminal bronchioles, connective tissue septa, and visceral pleura Drainage Pulmonary veins drain the remaining blood from distal structures LA Creates admixture of oxygenated and deoxygenated blood Lung Parenchyma (respiratory bronchioles alveoli) Supply Environment/ air *** Tertiary branches of the pulmonary arteries branch from the pulmonary trunk, but they do not “supply” *** Drainage Pulmonary veins supply oxygenated blood LA Intersegmental parts of pulmonary veins that lie in the connective tissue between segments and drain adjacent segments Low pressures Alveolar-Capillary Unit ~ 70% covered by a pulmonary capillary network 500-1000 capillaries per alveolus 280 billion pulmonary capillaries