| lymph | A clear, watery, sometimes faintly yellowish fluid derived from body tissues that contains white blood cells and circulates throughout the lymphatic system, returning to the venous bloodstream through the thoracic duct. Lymph acts to remove bacteria and certain proteins from the tissues, transport fat from the small intestine, and supply mature lymphocytes to the blood [Brenda]. | — |
| lymph node | Any of the rounded masses of lymphoid tissue that are surrounded by a capsule of connective tissue, are distributed along the lymphatic vessels, and contain numerous lymphocytes which filter the flow of lymph [Brenda]. | — |
| germinal center | The area in the center of a lymph node containing aggregations of actively proliferating lymphocytes [Brenda]. | — |
| tonsil | The human palatine tonsils and the nasopharyngeal tonsil are lymphoepithelial tissues located in strategic areas of the oropharynx and nasopharynx, although most commonly, the term tonsils refers to the palatine tonsils that can be seen in the back of the throat [Brenda]. | faucial tonsil |
| lingual tonsil | The lingual tonsils are rounded masses of lymphatic tissue that cover the posterior region of the tongue [Wikipedia: http://en.wikipedia.org/wiki/Lingual_tonsils]. | — |
| pharyngeal tonsil | Adenoids (or pharyngeal tonsil, or nasopharyngeal tonsil) are a mass of lymphoid tissue situated posterior to the nasal cavity, in the roof of the nasopharynx, where the nose blends into the throat [Wikipedia: http://en.wikipedia.org/wiki/Pharyngeal_tonsil]. | — |
| spleen | A highly vascular ductless organ that is located in the left abdominal region near the stomach or intestine of most vertebrates and is concerned with final destruction of red blood cells, filtration and storage of blood, and production of lymphocytes [Brenda]. | — |
| alimentary system | The human gastrointestinal tract refers to the stomach and intestine, and sometimes to all the structures from the mouth to the anus. (The "digestive system" is a broader term that includes other structures, including the accessory organs of digestion) [Wikipedia: http://en.wikipedia.org/wiki/Human_gastrointestinal_tract]. | — |
| oral cavity | The mouth is the first portion of the alimentary canal that receives food and [Wikipedia: http://en.wikipedia.org/wiki/Mouth]. | — |
| tongue | A fleshy movable process of the floor of the mouths of most vertebrates that bears sensory end organs and small glands and functions especially in taking and swallowing food and in humans as a speech organ [Brenda]. | — |
| salivary gland | The glands of the oral cavity whose combined secretion constitutes the saliva [Brenda]. | — |
| parotid gland | Either of a pair of large serous salivary glands situated below and in front of the ear [Brenda]. | — |
| submandibular gland | One of the three chief, paired salivary glands, predominantly serous, lying partly above and partly below the posterior half of the base of the mandible [Brenda]. | — |
| sublingual gland | Gland situated or administered under the tongue; the smallest of the three salivary glands, occurring in pairs, predominantly mucous in type, and draining into the oral cavity through 10 to 30 sublingual ducts [Brenda]. | — |
| tooth | 1: One of the hard bony appendages that are borne on the jaws or in many of the lower vertebrates on other bones in the walls of the mouth or pharynx and serve especially for the prehension and mastication of food and as weapons of offense and defense.n2: Any of various usually hard and sharp processes especially about the mouth of an invertebrate [Brenda]. | — |
| gum | The gingiva (sing. and plur.: gingiva), or gums, consists of the mucosal tissue that lies over the mandible and maxilla inside the mouth [Wikipedia: http://en.wikipedia.org/wiki/Gingiva]. | gingiva |
| pharynx | The part of the vertebrate alimentary canal between the cavity of the mouth and the esophagus.nThe pharynx of Nematodes is an efficient pump and forces food into the intestines [Brenda]. | — |
| nasopharynx | The upper part of the throat behind the nose. An opening on each side of the nasopharynx leads into the ear [Brenda]. | — |
| oropharynx | The Oropharynx (oral part of the pharynx) reaches from the Uvula to the level of the hyoid bone [Wikipedia: http://en.wikipedia.org/wiki/Oropharynx]. | — |
| hypopharynx | The portion of the pharynx that lies below the upper edge of the epiglottis and opens into the larynx and esophagus [Brenda]. | — |
| oesophagus | The esophagus (oesophagus) is an organ in vertebrates which consists of a muscular tube through which food passes from the pharynx to the stomach. During swallowing, food passes from the mouth through the pharynx into the esophagus and travels via peristalsis to the stomach. The word esophagus is derived from the Latin Åsophagus, which derives from the Greek word oisophagos, lit. "entrance for eating." In humans the esophagus is continuous with the laryngeal part of the pharynx at the level of the C6 vertebra. The esophagus passes through posterior mediastinum in thorax and enters abdomen through a hole in the diaphragm at the level of the tenth thoracic vertebrae (T10). It is usually about 25â30 cm long depending on individual height. It is divided into cervical, thoracic and abdominal parts. Due to the inferior pharyngeal constrictor muscle, the entry to the esophagus opens only when swallowing or vomiting [Wikipedia: http://en.wikipedia.org/wiki/Esophagus]. | — |
| stomach | A dilatation of the alimentary canal of a vertebrate communicating anteriorly with the esophagus and posteriorly with the duodenum [Brenda]. | — |
| intestine | The tubular part of the alimentary canal that extends from the stomach to the anus [Brenda]. | — |
| small intestine | The part of the intestine that lies between the stomach and colon, consists of duodenum, jejunum, and ileum, secretes digestive enzymes, and is the chief site of the absorption of digested nutrients. The proximal portion of the intestine [Brenda]. | — |
| duodenum | The first part of the small intestine extending from the pylorus to the jejunum [Brenda]. | — |
Comment on This Data Unit