The neck is the central part of the human body, and it is a high-risk part. Improper "neck hanging" may lead to a series of diseases, even fatal, and even cause high paraplegia in severe cases. Middle-aged and elderly people themselves have some cervical diseases, and the human body has a certain physiological curvature. If you don't understand the physiological curvature, blindly "hanging your neck" will damage the spinal cord.

Before doing cervical exercise, you must make a scientific evaluation, evaluate whether the cervical spine is in a state of functional or pathological structural problems, and reasonably judge the exercise that suits you.

The upper edge of the neck is the connecting line between the lower edge of mandible, the posterior edge of mandibular branch, mastoid process and extraoccipital protuberance, and the lower edge is the connecting line between the upper edge of sternum, clavicle, acromion and spinous process of the seventh cervical vertebra. This part is divided into anterior proper neck and posterior nape with the front edge of trapezius muscle as the boundary. The proper neck is bounded by sternocleidomastoid muscle and divided into anterior cervical region, lateral cervical region and sternocleidomastoid muscle region. The anterior cervical region, also known as the anterior cervical triangle, is divided into submental triangle, mandibular triangle, carotid triangle and muscular triangle by digastric muscle and scapulohyoid muscle. The lateral cervical region is also called the posterior cervical triangle, which is divided into occipital triangle and supraclavicular triangle by scapulohyoid muscle.

The hierarchical structure of the neck from shallow to deep (from front to back) is very clear, namely: skin, superficial fascia, deep cervical fascia and muscle. The deep fascia is divided into three layers: shallow, medium and deep. In the sheath formed between the shallow, middle and deep layers, the trachea, esophagus and blood vessels passing through the neck are contained. Interlaminar connective tissue is loose, forming a neck space.