plural of spina

(anatomy) A spine; the backbone. / (music) One of the quills of a spinet. / (historical) A barrier dividing the Ancient Roman hippodrome longitudinally.

(anatomy) The muscles of the back responsible for erect posture of the vertebral column.

(pathology) A birth defect resulting in a cleft in the spinal column through which the spinal membranes and spinal cord may protrude. It is characterised by hydrocephalus and other neurological disorders.

(endocrinology) The secretory capacity of the thyroid (if calculated with the structure parameter inference approach).

(endocrinology) The maximum amount of insulin that beta cells can produce per time-unit, a calculated biomarker for pancreatic beta cell function (if calculated with the structure parameter inference approach).

(endocrinology) The insulin receptor gain, a calculated biomarker for insulin sensitivity (if calculated with the structure parameter inference approach).