Sympathetic innervation changes from the thoracic splanchnics to lumbar splanchnics

Blood supply changes from superior mesenteric artery to the celiac trunk

Venous drainage changes from draining to the portal system to draining to the inferior vena cava

Parasympathetic innervation changes from pelvic splanchnics to vagus innervation

Norepinephrine

Acetylcholine

Dopamine

GABA

Glycine

Postganglionic neurons in the sympathetic nervous system

Postganglionic neurons in the parasympathetic nervous system

Preganglionic neurons in the parasympathetic nervous system

Preganglionic neurons in the sympathetic nervous system

None of these secrete epinephrine or norepinephrine