Acetylcholine distribution in the spinal cord of the rat.
Spinal cord of male albino rats is cut in four parts: the cervical enlargement (C2-C8) the thoracic cord (T1-T10) the lumbar enlargement (T11-L3) and the sacral extremity (L4-S4). A considerable increase in the acetylcholine levels from the cervical (0,80 g/g +/- 0,15 st.err.) to the sacral section (2,67 g/g +/- 0,48 st.err.) has been observed. It is concluded that the increase of acetylcholine levels in the lower part of spinal cord is the consequence of the relative increase of gray matter at this level.