The neck is the part of the body, on many terrestrial or secondarily aquatic vertebrates, that distinguishes the head from the torso or trunk. The adjective (from Latin) signifying “of the neck” is cervical (though in non-technical contexts, this is more frequently used to describe the cervix).
The cervical spine
The cervical portion of the human spine comprises seven bony segments, typically referred to as C-1 to C-7, With cartilaginous discs between each vertebral body.
The neck supports the weight of the head and protects the nerves that carry sensory and motor information from the brain down to the rest of the body. In addition, the neck is highly flexible and allows the head to turn and flex in all directions. From top to bottom the cervical spine is gently curved in convex-forward fashion. It is the least marked of all the curves of the column.