Sharp Dissection

Sharp dissection is a technique for separating the tissues using a knife
or scissors. You must be careful not to cut accidentally an important
structure. For healthcare providers without surgical expertise, sharp
dissection should be used primarily in emergencies, for making a hole
in the neck to create an airway, or for trying to enlarge a deep hole to
control life-threatening bleeding. In addition, sharp dissection is used
for undermining tissues (see below) or excising a lesion.