of the classification of the thyroid gland s. the anatomical variations and types of thyroid gland and

classfication thyroid gland shape anatomical variation type pyramidal lobe morphological feature endocrinology infographic internal diagram trachea hormone biology medical organ medicine endocrine parathyroid human health science illustration ultrasound normal anatomy right left isthmus levator glandulae thyroidea inferior artery hyoid bone horseshoeshaped thyrohyoid membrane