Figure 5.

Head plate holder assembly. Two head plate holders grip each side of a head plate. The head plate is permanently attached to the skull of a mouse. Head plate holder posts position the holders and head plate above the base plate with sufficient space for positioning the head of an adult mouse (see Figure 1B). The entire assembly is 22 mm tall, 14 mm wide, and just under 100 mm long. Inset: Detailed view of a head plate holder. The long arm has a square cross section (3.7 × 3.7 mm) that fits into a square hole in a holder post. One end of the head plate fits into the slot in the t-shaped end. The slot is 12 mm long, 1 mm wide, and 1 mm deep. The overall width is 14 mm and the overall length is 41 mm. These dimensions can be adjusted for different sized head plates.