Cannulas that are particularly configured for the injection of a fluid such as a dermal filler into the deep/sub-dermal tissue of a patient. The cannulas may include a substantially transparent cannula wall to facilitate visibility of fluids, including aspirated blood, within the cannula. The cannulas may also include palpation elements to facilitate palpation of the cannula when the cannula is inserted into the deep/sub-dermal tissue of a patient.
