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35 Cards in this Set
- Front
- Back
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What are the true muscles of the thoracic wall? |
1. Serratus posterior 2. Levator costarum 3. Intercostal 4. Subcostal 5. Transversus thoracis |
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What is the attachment of Serratus Posterior Superior? |
Superior border of 2nd to 4th ribs |
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What is the attachment of Serratus Posterior Inferior? |
Lateral border of 8th to 12th ribs |
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What is the arterial supply for Serratus Posterior? |
Intercostal arteries (for both inferior and superior) |
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What is the innervation for Serratus Posterior? |
Superior: 2nd-5th intercostal nerves
Inferior: T9-T12 intercostal nerves |
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What is the purpose of the Serratus Posterior muscles? |
Proprioception |
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Origin of Levator Costarum muscles? |
Transverse process of T7-T11 |
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Insertion of Levator Costarum muscles? |
Ribs adjacent and below near the turbercle and angle |
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Innervation of Levator Costarum muscles? |
Dorsal rami T8-T11 |
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Arterial supply of Levator Costarum muscles? |
Unknown??? |
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What is the division of the intercostal mucles? |
1. External 2. Internal 3. Innermost |
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Where are the external intercostal muscles located? |
External: Between ribs from the posterior tubercle to anterior costal cartilage |
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What is the purpose of the external intercostal membrane? |
External: To fill the gap between ribs where the external intercostal muscles end and the sternum |
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Where are the internal intercostal muscles located? |
Between ribs from the sternum to the angle of the rib posteriorly |
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What is the purpose of the internal intercostal membrane? |
To fill the gap between the internal intercostal muscles at the angle of the rib and the spine |
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What is a notable difference of the internal and externeral intercostal muscles? |
The internal muscles fibres run at right angles compared to the external |
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Where are the innermost intercostal muscles located? |
Innermost: Between ribs from the posterior tubercle to anterior costal cartilage |
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What is the purpose of the innermost intercostal membrane? |
Innermost: To fill the gap between ribs where the external intercostal muscles end and the sternum |
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What is unique about the innermost intercostal muscles? |
They are lined by the endothoracic fascia which, in turn, is lined by the parietal pleura of the lungs |
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When are the intercostal muscles most active? |
During forced respiration |
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What is the purpose of the intercostal muscles? |
To maintain the intercostal space under pressure |
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Where are the subcostal muscles located? |
Internal side of ribs near the angle that run upwards to insert onto the intercostal space two or three levels above |
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What is the function of the subcostal muscles? |
To assist the intercostal muscles |
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What is the origin of the Transversus Thoracis muscle? |
Inside of the sternum
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What is the insertion of the Transversus Thoracis muscle? |
Costal cartilages of ribs 2-6 |
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What is the innervation of the Transversus Thoracis muscle? |
TTM: Intercostal nerves |
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What is the arterial supply of the Transversus Thoracis muscle? |
TTM: Intercostal arteries |
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Where do the intercostal nerves originate from? |
The anterior rami |
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Where does most of the inferior intercostal arteries arise from? |
The descending thoracic aorta |
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Where are the unique branches the inferior intercostal artery branch? |
In the first two intercostal spaces from the superior intercostal artery |
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Where does the superior intercostal artery arise from? |
The subclavian artery |
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Where do the first six superior intercostal arteries arise from? |
The internal thoracic artery |
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Where do the remaining superior intercostal arteries arise from? |
The musculophrenic artery |
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Where do the posterior intercostal arteries drain into? |
1. Azygous venous system 2. Superior vena cava |
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Where do the anterior intercostal arteries drain into? |
Internal thoracic vein |
