Fig.24.1. Cricothyroid muscle and thyroid gland. Uultrasound anatomy. Anterior view.
A. Origin and insertion of cricothyroid muscle. Origin - anterolateral surface of the cricoid cartilage. Insertion - lower bor-der of the internal and external surfaces of the thyroid cartilage lamina. B - Position of cricothyroid muscle. C - Origin of cricothyroid muscle and inferior constrictor muscle of the pharynx. D - Position of cricothyroid muscle and inferior con-strictor muscle of the pharynx. E - Cricothyroid muscle, inferior constrictor muscle of the pharynx and thyroid gland. F - Schematized transverse section at the level of inferior horns of the thyroid cartilage and upper thyroid poles. Horizontal lines show the levels of transverse section. Numbers indicate anatomical structures and structural elements in fig.24.1-24.3. Cartilago thyroidea - lamina (1), cartilago thyroidea - linea obliqua (2), ñartilago thyroidea - cornu inferius (3) cartilago cricoidea (4), m.cricothyroideus - pars recta (5), m.cricothyroideus - pars obliqua (6), musculus constrictor pharyngis inferior (7), lig.cricothyroideum (8), glandula thyroidea (9).



Fig.24.2. Cricothyroid muscle and thyroid gland. Ultrasound anatomy.
A - Origin and insertion of cricothyroid muscle. Right lateral view and view from inner side of the thyroid cartilage. B - Site of cricothyroid muscle. Right lateral view and view from inner side of the thyroid cartilage. C - Site of cricothyroid muscle, inferior constrictor muscle of the pharynx and thyroid gland. D - Schematized transverse section at the level of the cricoid cartilage arch and upper thyroid poles.



Fig.24.3. Transverse echograms at the level of cricothyroid muscle.
A - at the level of the middle third of inferior horns of the thyroid cartilage.
B - at the level of the cricoid cartilage arch.