THORACIC INLET
- Superior aperture of thoracic cavity
- Reniform in shape
- Inlet slopes downwards & anteriorly at an 1450
- Partially closed on each side by suprapleural membrane (Sibson's fascia)
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Boundaries:
- Ant - upper border of manubrium sterni
- Post - body of 1st thoracic vertebra (T1)
- Each side - 1st rib + its costal cartilage.
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Structures passing through thoracic inlet:
- Trachea
- Esophagus
- 2 sets of Arteries (branches of Arch of Aorta)
- 4 sets of neural structures
- Rt. & Lt. Vagus N. (X)
- Rt. & Lt. Phrenic N. (C3,4,5)
- Rt. & Lt. Sympathetic Trunks
- Rt. & Lt. 1st Thoracic N. (Ventral rami)
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* Apices of lungs covered by cervical pleura and also project upward through inlet into root of Neck
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MBBS Lecture Notes for all subjects (updated for 2021 syllabus) - All universities