after a survival period of 48 to 72 hours , the bilateral superior cervical ganglia , middle cervical ganglia , stellate ganglia , t-4 sympathetic paravertebral ganglia , geniculate ganglia , semilunar ganglia , nodose ganglia , and brain stem including midbrain , pons , and medulla oblongata were removed to be processed with tetramethyl benzidine .
C0006121
brain stem
C0025462
midbrain