In which layer is india ink injected during a procedure?

India ink is typically injected into the submucosal layer during endoscopic procedures for the purpose of marking lesions or areas of interest. This layer provides the necessary support for the mucosal layer while allowing the ink to spread adequately, making the lesion more visible during subsequent procedures like surgical excision.

Injecting india ink into the submucosal layer is beneficial because it has the right balance of depth and accessibility; it is not too superficial, which would restrict visibility, nor too deep, which could complicate the identification of lesions. This technique aids surgeons in accurately locating targeted areas for resection or other interventions.