6 Thoracic outlet Opening at root of neck. Oesophagus , trachea and blood vessels pass through itThoracic outlet
7 Endothoracic fascia Loose connective tissue Separate parietal pleura from thoracic wallEndothoracic fascia
8 Intercostal muscles (3 types) External intercostal muscle:Fibers directed downward and forwardFrom inferior border of rib above to superior border of rib belowAponerosis: Ant.(external) intercostal membrane
9 2. Internal intercostal muscle Intermediate layerFibers directed downward and backwardFrom subcostal groove of rib above to upper border of rib belowAponeurosis: post. (internal) intercostal membrane
10 3.Innermost Intercostal muscle Deepest layerCorresponds to transversus abdominis in abdominal wallCroses more than one intercostal spaceRelated to endothoracic fascia.Blood vessels,nerves pass between intermediate and deepest layer.
13 Origin of diaphragmThin muscular tendinous septum,separate chest cavity above from abdominal cavity.Sternl part:arises from post. Surface of xiphoid processCostal Part:arise from deep surface of lower six ribs and costal cartilage.Verterbral part:arises from vertebral column nd arcuate ligament.Inserted into central tendonRt.dome: upper border of 5th ribLt. dome: lower border of5th rib
15 Diaphragm Muscle of Inspiration Muscle of Abdominal Straining Nerve/ActionFunctionMotor nerves:rt,lt. phrenic nerves C3,4,5Sensory nerves:Phrenic nerve and lower six intercostal nervesAction:On contraction, diaphragm pulls down central tendon and inc. vertical diameter of thorax.Muscle of InspirationMuscle of Abdominal StrainingWeight lifting muscleThoracoabdominal pump