Summary of spinal cord operations on Monodelphis domestica, indicating postnatal age at operation (day of birth = P0), nature of spinal lesion (crush or cut), and age at time of study
| Postnatal age at operation (d) | Operation | Age at time of study | n | Methods | |||
|---|---|---|---|---|---|---|---|
| B | E | M | P | ||||
| 5–8 | Crush | P5–P9 (+0–24 hr) | 25 | 11 | 18 | ||
| 6–7 | Cut | P6–P8 (+0–24 hr) | 13 | 13 | |||
| 6 | Cut | 2 months | 3 | 3 | 3 | ||
| Controls | 2 months | 3 | 3 | ||||
| 7–8 | Crush | 3 months | 8 | 8 | |||
| Controls | 3 months | 3 | 3 | ||||
| 4 | Cut | 6 months | 3 | 3 | 1 | 1 | |
| Controls | 6 months | 3 | 3 | 2 | |||
| 7–8 | Crush | 2–3 years | 10 | 10 | 5 | 8 | 3 |
| Controls | 3 years | 8 | 5 | 3 | 5 | 2 | |
Methods of study: B, behavior; E, electrophysiology; M, morphology; P, pathway tracing (dextran amine injections);n, number of animals. Numbers in Methods column refer to the numbers of animals and preparations studied by the methods indicated; in some cases more than one method was applied to some preparations. A further 19 animals (P11–P27 at time of study) were used for electrophysiology studies of crush preparations (see Table 2).