The<unk>  is the smallest of the three<unk>  ganglia, and is occasionally absent. It is placed opposite the sixth<unk>  vertebra, usually in front of, or close to, the inferior thyroid artery. It sends gray rami communicantes to the fifth and sixth<unk>  nerves, and gives off the<unk>  cardiac nerve. It is probably formed by the coalescence of two ganglia corresponding to the fifth and sixth<unk>  nerves.
Middle cervical ganglion
Stellate ganglion
Aorticorenal ganglion
Rostral ventrolateral medulla
Caudal pontine reticular nucleus
Ciliospinal center
Lateral vestibulospinal tract
Paramedian reticular nucleus