Transversal cross-sectional image at thoracic level T8 at the level of the thoracic paravertebral (TPV) space (dotted outline). (A) Ultrasound image, (B) illustration, and (C) cryosection. eim = external intercostal muscle; es = erector spinae muscle; IAP = inferior articulate process; iimb = internal intercostal membrane (green); lc = levator costarum muscle; p = pleura; SCTL = superior costotransverse ligament (pink); ST = sympathetic trunk; trap = trapezius muscle. This figure was reproduced, with adaptations, with permission from Bigeleisen P, Gofeld M, Orebaugh SE: Ultrasound Guided Regional Anesthesia and Pain Medicine, 2nd edition, Wolters Kluwer, 2015. Adaptations are themselves works protected by copyright. So in order to publish this adaptation, authorization must be obtained both from the owner of the copyright in the original work and from the owner of copyright in the translation or adaptation.