The suprapleural membrane, also known as Sibson fascia, is a dense fascial layer that is attached to the inner border of the first rib and costal cartilage anteriorly, C7 transverse process posteriorly and to the mediastinal pleura medially.
It is flat and lies in the oblique plane of the thoracic inlet, with a cervical dome of pleura attached to its under surface. Lying on it are the subclavian vessels and other structures in the root of the neck. The function of the membrane is to provide rigidity to the thoracic inlet that prevents distortion due to changes in intrathoracic pressure during respiration.
History and etymology
The fascia was named for Francis Sibson (1814-1876), a British physician and anatomist 4.
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- 4. Osiro S, Downs E, Grater J, Loukas M. Francis Sibson (1814-1876): the unsung hero of modern surgery and anesthesia. (2012) World journal of surgery. 36 (8): 1993-7. doi:10.1007/s00268-012-1573-5 - Pubmed