The head and neck are emptied of blood by the subclavian vein and jugular vein. [citation needed] They line the oral, nasal, and external auditory meatus, (ear), providing lubrication and protection against pathogens. Our skin also helps regulate body temperature and eliminate waste through perspiration. The medical information on this site is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes. The facial bones usually form into pairs and then fuse together. EnchantedLearning.com is a user-supported site. It is a semi-circular area. There are various tooth shapes for different jobs. The term also is used to describe the anterior or fore part of animals other than … The right and left external jugular veins drain from the parotid glands, facial muscles, scalp into the subclavian veins. Head, in human anatomy, the upper portion of the body, consisting of the skull with its coverings and contents, including the lower jaw. In most other animals the facial portion of the skull, including the upper teeth and the nose, is larger than the cranium. This article was most recently revised and updated by, How Stuff Works - Healthguide - Cranial CT Scan. The lungs are responsible for removing oxygen from the air we breathe and transferring it to our blood where it can be sent to our cells. The urinary system helps eliminate a waste product called urea from the body, which is produced when certain foods are broken down. Association neurons are located in the grey matter of the spinal cord and the brain. A lively and informative new podcast for kids that the whole family will enjoy! Teeth are surrounded by gingiva, or gums, part of the periodontium, support tissue of oral cavity protection. The antennae…, Generally, the head is bilaterally symmetrical, bearing one or two pairs of tentacles, often with accessory palps, and the mouth in the middle of the ventral margin. The rounded upper projections of the back teeth are cusps. Blood from the brain and neck flows from: (1) within the cranium via the internal jugular veins, a continuation of the sigmoid sinuses. [citation needed] They line the oral, nasal, and external auditory meatus, (ear), providing lubrication and protection against pathogens. The skin is made up of three microscopic layers: epidermis, dermis, and hypodermis. Astrocytes may also be responsible for transporting ions (electrolytes) from the brain to the blood. The atlas joins with the occipital condyle above and the axis below. This page was last edited on 27 September 2020, at 10:34. The epidermis is composed of stratified squamous epithelium and is divided into the following five sublayers or strata, listed in order from outer to inner: The mouth, also called the oral cavity, is the entranceway into the digestive system containing both primary and accessory organs of digestion. The skeleton not only helps us move, but it's also involved in the production of blood cells and the storage of calcium. In the brain, the endothelial cells fit tightly together to create a tight junction and substances cannot pass out of the bloodstream. 1 Topics. The spinal nerves arise from the spinal column. See human head anatomy stock video clips. Oral cancer may have a viral link. A critical junction between the respiratory and digestive systems is the epiglottis, a cartilage flap which shuts during swallowing to prevent aspiration. As the cranium fuses, sutures are formed that resemble stitching between bone plates. Major sensory organs located in the head include: Ears: The outer, middle, and inner ear are responsible for collecting auditory information. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. The nervous system is composed of a central nervous system (CNS), brain and spinal cord, and the peripheral nervous system (PNS), cranial nerves and spinal nerves. The tooth breaks through the gum into the mouth in a process called eruption. What is the cause of my head rash? Tooth enamel lends great strength to the tooth structure. The following are the terms for the basic features of the head as they affect haircutting: Top: The top of the head is simple to understand. The central nervous system includes the brain and spinal cord.