Functional features

1. The upper end of the model was cut horizontally from the upper side of the eyebrow arch to the posterior part of the skull to the intersection of the herringbone suture, and the lower end was cut horizontally from the fifth rib.2. The location of brain n, basilar artery and the starting segment of anterior, middle and posterior arteries were shown; The right side of the neck shows the direction and distribution of common carotid artery, vertebral artery, thyroid neck trunk, superficial carotid artery, superior and inferior thyroid artery, lingual artery, facial artery, internal and external carotid artery and maxillary artery branches.3. The morphology and location of thyroid gland, laryngeal cartilage, submandibular gland and cervical plexus were shown; The chest showed trachea, bronchus, aortic arch and branches, intercostal blood vessels and nerves, subclavian artery, axillary artery, etc.