Autonomic ganglia ( GA ; Langley, 1900 ) : A topographic division of vertebrate peripheral ganglia with gray matter regions that are distinguished from the craniospinal ganglia, and for description are divided into paravertebral ganglia, prevertebral ganglia (Gaskell, 1886), and terminal ganglia (Gaskell, 1886). Galen (c173-c192) described at least three pairs; see translations by Duckworth (1962, pp. 217-218), May (1968, pp. 695-696), Smith (1971, p. 179). The term was introduced by Langley (1900, pp. 677-678).