Anatomy and Structure of the Neck - The neck connects the head with the torso in vertebrates. - It supports the weight of the head and protects the nerves. - The neck is highly flexible, allowing the head to turn and flex. - Four compartments in the human neck: vertebral, visceral, and two vascular compartments. - Structures within the neck include cervical vertebrae, respiratory and digestive tracts, endocrine glands, nerves, arteries, and veins.

Neck Triangles and Muscles - Neck muscles attach to the skull, hyoid bone, clavicles, and sternum. - Two major neck triangles: anterior and posterior. - Anterior triangle bounded by sternocleidomastoid muscle, mandible, and midline of the neck. - Anterior triangle contains suprahyoid and infrahyoid muscles. - Posterior triangle bordered by sternocleidomastoid muscle, trapezius muscle, and clavicle.

Nerve Supply of the Neck - Sensation in the front areas of the neck comes from spinal nerves C2-C4. - Sensation in the back of the neck comes from spinal nerves C4-C5. - Accessory nerve and vagus nerve travel down the neck. - Nerves from the human spine also contribute to the neck's nerve supply.

Blood Supply and Vessels of the Neck - Arteries supplying the neck include common carotid arteries. - Common carotid arteries bifurcate into internal and external carotid arteries. - Neck also contains veins such as the internal jugular vein and external jugular vein. - Blood vessels in the neck are important for the neck's blood supply. - Arterial dissections and internal jugular vein thrombosis can be sources of neck pain.

Neck Pain, Disorders, and Research - A population-based study found a prevalence of neck pain and identified associated factors. - Neck circumference has been linked to cardiometabolic risk factors. - Neck circumference can also be a predictor of mechanical ventilation support in COVID-19 patients. - Neck circumference has been shown to predict mortality in hospitalised COVID-19 patients. - Neck circumference has been associated with upper-body and lower-body adipose tissue.