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Transversus Thoracis Muscular Plane Block
The transversus thoracis muscular (TTM) plane block is a parasternal approach to block the anterior branches of the intercostal nerves (T2 through T6). This block can be effective for surgeries and fractures near or at the sternum (median sternotomy, thymectomy, mediastinoscopy, pericardial window, etc.). This block also may be useful for sub-xiphoid incisions.
The Transversus Thoracis Muscle
The transversus thoracis muscle arises from the posterior surface of the lower third of the sternum. The muscle consists of four or five slips that pass laterally to the second through sixth costal cartilages. The transversus thoracis muscle is smooth with uniform thickness (1 to 2 mm), and this muscle is in continuity with the transversus abdominis muscle.
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