1. Keen's Point : Parietal Burr hole - 3 cm above and 3 cm behind the external auditory meatus.
Direction of canula - Perpendicular to the cortex and slightly cephalic
Length of insertion about 4 to 5 cm.
2. Kocher's Point : Frontal Burr hole - 2 to 3 cm lateral to mid line and 1 cm anterior to coronal suture in the mid pupilaary line.
Direction of canula - Coronal plane towards ipsilaterl inner canthus and AP plane towards EAM.
Length of insertion about 5 to 6 cm.
3. Dandy's point : Occipital burrhole - 2 cm lateral to the midline and 3 cm above the inoin. In infants this usually corresponds with the lambdoid suture in the mid pupillary line.
Direction of canula - Perpendicular to the cortex and slightly cephalic.
Length of insertion about 4 to 5 cm.
4. Frazier's point : 3 to 4 cm lateral to the midline and 6 cm above the inion.
Direction of canula - Perpendicular to the cortex.
Length of insertion about 4 to 5 cm.
