ANAT 1625 Lecture Notes - Thorax

ANAT 1625 Lecture Notes - Thorax - 1 Thoracic wall Muscles...

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Thoracic wall Muscles 1. pectoralis major 2. pectoralis minor 3. subclavius 4. serratus anterior 5. external intercostal muscle and external intercostal membrane 6. internal intercostal muscle and internal intercostal membrane 7. innermost intercostal muscle 8. sternocostalis ( transversus thoracis ) Nerves 1. lateral pectoral nerve arises from the lateral cord of brachial plexus 2. medial pectoral nerve arises from the medial cord of brachial plexus 3. intercostal nerve gives two branches a) anterior cutaneous nerve b) lateral cutaneous nerve Arteries of the thoracic wall Thoracic aorta Supplies through the posterior intercostal and subcotal arteries Subclavian artery Supplies through the internal thoracic and supreme intercostal arteries The right subclavian artery arises from the brachiocephalic trunk The left side subclavian artery arises from the arch of aorta The internal thoracic ( mammary ) artery Is a branch of subclavian artery, runs behind the upper six costal cartilages At the 6 th intercostal space it splits into superior epigastric and musculophrenic arteries Axillary artery Is the continuation of subclavian artery at the outer border of rib # 1 Branches of the axillary artery a) thoracoacromial artery ( trunk ) splits into acromial, pectoral, clavicular and deltoid branches b) lateral thoracic artery is a branch of axillary artery Anterior intercostal arteries Are branches of internal thoracic artery, supply the 1-6 intercostal spaces 1
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Anterior intercostal arteries are branches of musculophrenic artery, supplies 7-9 intercostal spaces Supreme intercostal artery Is a branch of costocervical trunk of subclavian artery, supplies the 1 st and 2 nd intercostal spaces of the posterior aspect Posterior intercostal artery Is a branch of descending thoracic aorta, supplies the 3-11 intercostal spaces of the posterior aspect Subcostal artery Is a branch of thoracic aorta, runs beneath the 12 th rib, supplies the muscles of the anterolateral abdominal wall Veins of the thoracic wall Posterior intercostal veins Are 11 and 1 subcostal vein on each side and they end in azygos and hemiazygos venous system Anterior intercostal veins End in the internal thoracic vein Right superior intercostal vein Is formed by the 2 nd . 3 rd , 4 th posterior intercostal veins and ends in the azygos vein Left superior intercostal vein Is formed by the 2 nd , 3 rd left posterior intercostal veins and ends in the left brachiocephalic vein Internal thoracic veins Run with the internal thoracic artery and end in subclavian vein Cephalic vein Runs in the deltopectoral groove, enters the deltopectoral triangle and joins the axillary vein Axillary vein Continues as subclavian vein at the outer border of rib # 1 Subclavian vein 2
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Is the continuation of axillary vein at the outer border of rib # 1 Deltopectoral triangle Space bordered by 1. clavicle 2. clavicular head of pectoralis major 3. anterior border of deltoid muscle The breasts Are normally well developed only in women and they are most prominent superficial
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