Physiological sensor with offset adhesive layer

A sensor assembly comprising:

• a generally planar sensor pad having a perimeter, said sensor pad having a top side and a bottom side wherein said bottom side is configured to be toward a patient's skin and said top side is configured to be away from the patient's skin when said sensor is applied to the patient;
• a light source disposed on the sensor pad and configured to transmit light through part of a patient's body;
• a light detector disposed on the sensor pad and configured to receive light transmitted by the light source after said light has traveled through part of the patient's body;
• a cable extending from the perimeter of the sensor pad;
• and
• an adhesive layer including an adhesive disposed on a material layer, said adhesive layer being disposed below said bottom side of said sensor pad and said adhesive layer being configured to adhere said sensor pad to the patient's skin;
• wherein one part of the adhesive layer extends beyond the perimeter of the sensor pad and another part of the adhesive layer at a location spaced from the cable does not extend beyond the perimeter of the sensor pad.