parathyroid gland morphology trait Trait.ontology VT:0000678 Any measurable or observable characteristic related to the shape, structure, color, or pattern of one of the two small, paired endocrine glands, usually found embedded in the connective tissue capsule on the posterior surface of the thyroid gland; they secrete parathyroid hormone (PTH) that regulates calcium and phosphorus metabolism. gland morphology trait