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14 Cards in this Set
- Front
- Back
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Thorax and thoracic cavity location
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superior portion of the trunk
located between the neck and abdomen |
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Thoracic Cage Constituents
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12 prs. Ribs (true, false, floating)
Sternum Costal Cartilages 12 Thoracic Vertebrae |
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Thoracic Wall
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MUSCLES AND VESSELS
...and a few nerves... |
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Muscles of Respiration
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Internal/external intercostals
Diaphragm Accessory |
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External Intercostal muscles
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-located between ribs, intercostal space
-run inferomedially -function to elevate ribs, increasing lateral and anteroposterior spaces of thoracic cavity to accomodate air. -Nerve: intercostal nerves |
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Internal intercostal muscles
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-Location: intercostal space
-Function: Depress ribs, thereby decreasing thoracic cavity space, for forced expiration of air. -Nerve: intercostal |
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Diaphragm
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Origin: xiphoid process, lower 6 ribs, upper two lumbar vertebra
Insertion: Central tendon, forms a wide musculofibrous sheet btwn thoracic and abdominal cavities. Innervation: phrenic, some intercostals. Function: aids in inspiration of air |
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Accessory respiratory muscles
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Inspiration: Scalene, Sternocleidomast, pectoralis minor.
Expiration: abdominal muscles |
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Blood Supply/return from thorax
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Arteries:
-Anterior intercostal artery -Posterior thoracic artery Veins: -Posterior intercostal vein -Anterior intercostal vein |
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Anterior Intercostal artery
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-Supplies blood to anterior thoracic wall.
-Branches from Internal Thoracic Artery |
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Posterior Thoracic Artery
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Direct branch of aorta
-supplies blood to posterior thoracic wall. |
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Posterior intercostal vein
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Drains blood from posterior rib musc.
-Joins azygous vein system, drains to Superior Vena Cava. |
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Anterior intercostal veins
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Drain blood from anterior rib muscles
-Join the internal thoracic vein, then the brachiocephalic vein or SVC. |
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Innervation of Thoracic walls/floor
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Walls: T1-T12 (subcostal nerve)
Diaphragm: Phrenic Nerve (C3-C5)and peripheral intercostals. |
