has part has part has_part characteristic of has modifier abnormal superior cervical ganglion morphology superior cervical ganglion degeneration degeneration of ganglion cervicale superius retrogressive pathological change or loss of the largest group of paravertebral ganglia of the sympathetic trunk which normally lies at the base of the skull and innervates the head and neck MPheno.ontology MP:0009561 abnormal degeneration superior cervical ganglion