Chapter 11 Study Guide: Digestive System Terminology

Anatomical Structures and Physiological Processes of the Digestive System

• Alimentary Canal Foundations:

  • The anatomical term alimentary literally translates to "to nourish."

  • The tube extending from the pharynx (throat) directly to the stomach is the esophagus (esophogus), which literally translates to "gullet."

  • The gastric rugae define the internal macroscopic mucosal ridges lining the stomach wall; the term literally translates to "stomach folds."

  • The muscular ring encircling the junction between the distal stomach and the proximal duodenum is the pyloric sphincter, controlling chyme emptying.

  • The jejunum is the second portion of the small intestine; its etymological name literally translates "to empty."

  • The mesentery is the broad, fan-shaped peritoneal fold that suspends, encircles, and tethers both the jejunum and ileum to the dorsal wall of the abdomen, carrying vasculature and nerves.

  • The peritoneum (periontrum) is the serous membrane that provides the structural internal lining for organs located within the abdominal and pelvic cavities.

• Accessory Digestive Organs and Glands:

  • The liver is the primary metabolic organ responsible for the synthesis and production of bile.

  • The pancreas is a composite organ possessing dual physiological responsibilities, functioning in both an endocrine capacity (secretion of insulin and glucagon) and an exocrine digestive capacity (production and secretion of digestive enzymes into the duodenum).

  • Anatomical classification of salivary glands excludes subglossal; subglossal is not a true salivary gland (which primarily comprise the parotid, submandibular, and sublingual glands).

• Mechanics and Dynamics of Digestion:

  • Mastication defines the mechanical process of chewing food in the mouth (e.g., a $5$-year-old child who is masticating food is actively chewing).

  • The nutritional term bolus refers to a cohesive, lubricated "ball or lump" of masticated food formed prior to swallowing.

  • The nutritional term chyme defines the semifluid mass of partly digested food expelled by the stomach into the duodenum; it literally translates to "juice."

  • The sensory term gustation originates from the Old French root signifying "to feel," although its true physiological and anatomical definition is "to taste."

Medical Terminology, Combining Forms, and Etymology

• Oral and Craniofacial Word Parts:

  • os-, or/o, and stomato-: Combining forms that all literally denote the "mouth."

  • cheil/o-: Pertains to the lip; cheilorrhaphy (cheil/orrhaphy) is the surgical suturing of the lips.

  • gloss/o-: Pertains to the tongue; glossorrhaphy is the surgical procedure designating the suture of the tongue.

  • dento- and donto-: Word roots that both signify "tooth."

  • incision/or: Anatomical and surgical term whose literal translation is "one who cuts in."

• Gastrointestinal and Abdominal Word Parts:

  • enter/o-: Greek combining form enteron, which literally translates to "intestine," but is specifically used in clinical terminology to refer to the "small intestine."

  • proct/o-: Combining form specifically denoting both the "rectum and anus."

  • cholangio-: Combining form specifically referring to the "bile duct."

  • ptyalo-: Word part defining "mucus, saliva, fluid."

  • mal/occlu/sion: Structural dental term that literally breaks down into "bad/closure/refers," describing misalignment of opposing teeth.

• Pathological and Procedural Root Terms:

  • litho-, petro-, and lapio-: Distinct word roots and prefixes that all denote a "stone" or calculus.

  • ferro- and sidero-: Combining forms and prefixes that signify the element "iron."

  • -cele: Suffix denoting "a rupture, hernia, or protrusion."

  • enema: Medical and procedural term that literally translates "to inject."

  • ascaris: Greek taxonomic term that literally translates to "intestinal worm."

  • tapeworm: Parasitic cestode whose common descriptive name literally translates to "narrow banded worm."

  • cholera: Acute enteric infection whose name literally denotes "bile like flowing."

Pathology, Clinical Conditions, and Diagnostic Terms

• Oral and Dental Pathologies:

  • Dental Caries: Diagnostic term referring specifically to tooth decay or cavities.

  • Tartar: Common clinical designation for hardened, calcified dental plaque accumulated on the dentition.

  • Gingivitis: Diagnostic term denoting acute or chronic inflammation of the gums.

  • Gingival Hyperplasia: Pathological overgrowth and enlargement of the gums, recognized clinically as a classic adverse drug effect in epilepsy patients receiving pharmacological therapy with phenytoin for seizure management.

  • Leukoplakia (Leukoplaquia): Clinical condition characterized by the formation of an adherent, white, plate-like plaque on the gingiva and mucous membranes of the oral cavity.

  • Pyorrhea: Advanced stage of periodontal degeneration; the clinical conditions periodontitis (periodontis), Riggs disease, and periodontoclasia (periodontclasia) all refer directly to pyorrhea.

  • Bruxism: Diagnostic term defining the involuntary or habitual clenching or grinding of teeth.

• Upper and Lower Gastrointestinal Tract Disorders:

  • Dysphagia: Clinical term denoting difficult or impaired swallowing or eating; commonly encountered in patients who have suffered a stroke (cerebrovascular accident).

  • Gastroesophageal Reflux Disease (GERD): Clinical condition involving the retrograde flow of acidic stomach contents into the esophagus, commonly referred to as "heart burn."

  • Gastritis: Localized inflammation targeting the mucosal wall and gastric rugae of the stomach.

  • Peptic Ulcer: Ulcerative lesion occurring in the stomach or duodenal wall; the diagnostic term literally translates to "digestion/sore."

  • Ileitis: Localized inflammation specifically restricted to the ileum.

  • Crohn's Disease (Chrons disease): Chronic inflammatory bowel disease of the small and/or large intestines, pathologically distinguished by transmural cobblestone ulcerations along the intestinal lining and deep scar tissue formation; clinically recognized alternatively as chronic regional ileitis (Chornic regional iletitis).

  • Acute Appendicitis: Acute inflammation of the vermiform or cecal appendage.

  • Diverticulosis (Divertculo/o/sis): Abnormal clinical condition characterized by the formation of outpouchings in the colon wall; literally defined as a "condition of outpouching swellings" (outpouching of outpouching swellings).

  • Irritable Bowel Syndrome (IBS): Functional gastrointestinal disorder that clinically and etymologically refers to "painful intestines."

  • Proctitis: Localized inflammation involving the rectum and the anus.

  • Hemorrhoids (Hemmorrhoids): Dilated vascular structures in the anal canal; the literal root breakdown translates to "blood/bursting forth/resembles."

  • Dysentery (Dys/entery): Severe intestinal disorder characterized by literal translation as "faulty, difficult, and painful intestines" or a "faulty or painful intestinal process."

• Hepatic, Biliary, and Pancreatic Disorders:

  • Cirrhosis: Chronic, irreversible clinical disease of the liver marked pathologically by the progressive destruction of functional liver cells (hepatocytes) and widespread fibrotic scarring.

  • Hepatoma (Hepat/oma): Neoplasm of the liver; literally denotes "liver/tumor."

  • Cholecystitis: Acute or chronic inflammation affecting the gallbladder.

  • Steatorrhea: Clinical condition characterized by the pathological presence of excess fat in the feces, classically observed in association with chronic pancreatitis and pancreatic exocrine insufficiency.

• Mechanical Obstructions, Hernias, and Structural Defects:

  • Volvulus (volvus): Mechanical twisting or torsion of a loop of intestine (most commonly the ileum or sigmoid colon) upon itself, resulting in intestinal obstruction and compromised perfusion (e.g., diagnosed in a female neonate presenting with twisted intestines).

  • Hernias: Pathological protrusions of internal structures through supporting walls:

  • Abdominal Hernia: Abnormal anatomical protrusion of viscera directly through the muscular abdominal wall.

  • Inguinal Hernia: Represents the most common clinical type of hernia.

  • Hiatal Hernia: Upward protrusion of the superior portion of the stomach through the esophageal hiatus of the diaphragm into the thoracic cavity.

  • Fistula: Abnormal, chronic, pipe stem-like passageway communicating between two internal organs or leading from an internal hollow organ to the external surface of the body.

  • Mixed Neoplasm: Abnormal neoplastic tissue growth composed of derivatives of two or more distinct germinal layers.

• Infectious Diseases:

  • Giardiasis: Protozoan infection caused by Giardia lamblia, exhibiting high incidence and transmission rates among children in daycare centers.

  • Shigellosis: Acute bacterial infection causing severe bacillary dysentery; formally confirmed and diagnosed in laboratory settings by identifying the pathogen directly within a stool sample.

  • Hepatitis Viral Spectrum:

  • Hepatitis A: Acute viral infection caused by the Hepatitis A virus; clinically designated as infectious hepatitis.

  • Hepatitis B: Viral infection caused by the Hepatitis B virus; clinically designated as serum hepatitis (serum hapatitis).

  • Hepatitis C: Bloodborne viral hepatitis (Hepatitis C) characterized by an insidious clinical course that can remain completely dormant within the host body for years prior to the emergence of active signs and clinical symptoms.

• Nutritional, Systemic, and Behavioral Conditions:

  • Dysphonia (Dys/phonia): Diagnostic term denoting an impairment or abnormality in vocal production; literally translates to "faulty voice."

  • Anorexia Nervosa: Severe psychological eating disorder characterized by persistent and prolonged refusal to eat; the diagnostic term literally breaks down as "without appetite caused by a nervous condition."

  • Bulimia (Bulim/ia): Episodic binge eating disorder; the diagnostic term literally means and refers to "hunger."

  • Hypercholesterolemia (Hyper/cholesterol/emia): Pathological elevation of total blood cholesterol levels, clinically identified in a $20$-year-old patient when laboratory values meet or exceed the diagnostic threshold of $200\,mg/dL$.

  • Diabetes Insipidus: Endocrine pathology presenting with hallmark manifestations of polyuria (excessive urinary volume output) and polydipsia (excessive thirst).

Diagnostic Procedures, Surgical Interventions, and Clinical Scenarios

• Diagnostic Imaging and Endoscopy:

  • Upper GI Series: Diagnostic radiological examination consisting of a sequential series of X-ray films captured of the esophagus, stomach, and duodenum following the oral ingestion of a barium sulfate contrast medium.

  • Cholangiography: Radiographic visualization and procedural X-ray filming specifically directed at the bile ducts and gallbladder.

  • Coloscopy: Procedural diagnostic term referring to the direct visual examination, inspection, and luminal evaluation of the large intestine (colon).

  • Proctoscopy (Protoscopy): Procedural term defining the direct visual examination of the internal lumen of the rectum.

  • Proctoscope (protoscope): The dedicated diagnostic medical instrument utilized by clinicians to perform a visual examination of the rectum.

• Surgical Interventions and Specialists:

  • Choledocholithotripsy (Choledocholith/otripsy): Surgical procedure involving the fragmentation or crushing of an obstructing calculus (stone) situated within the common bile duct.

  • Colostomy: Surgical operative procedure involving the incising and exteriorization of the large intestine to construct a permanent or temporary artificial mouth or stoma on the abdominal wall.

  • Orthodontist: Specialized dental practitioner focused exclusively on the prevention, diagnosis, and correction of misaligned dentition, specializing in straightening teeth.

Nutrition, Vitamins, and Essential Minerals

• Nutritional Fundamentals:

  • The human body requires a total of $6$ essential body nutrients for the maintenance of basal homeostasis, tissue repair, and physiological cellular metabolism.

• Vitamins and Specific Deficiency Disorders:

  • Vitamin B1 (Thiamin / Thiamine):

  • Severe dietary deprivation of thiamin leads directly to the development of beriberi (beri/beri).

  • The diagnostic designation beriberi translates to and refers directly to "body weakness."

  • Vitamin B2:

  • Identified chemically and biologically under the standardized designation riboflavin.

  • Niacin (Niacinamide):

  • Dietary deficiency of niacin or its amide form precipitates pellagra (pell/agra).

  • The clinical term pellagra literally translates to "skin/rough" (referring to the characteristic severe dermatitis associated with the condition).

  • Vitamin C (Ascorbic Acid / Absorbic acid):

  • Critical water-soluble antioxidant vitamin; profound dietary deficiency leads to scurvy.

  • The diagnostic term scurvy literally translates to "to scratch."

• Essential Dietary Minerals and Food Sources:

  • Zinc: Trace element with vital enzymatic and immune functions; whole grains serve as a major primary dietary supplement and natural source.

  • Chloride: Primary extracellular anion readily obtained in the diet through the consumption of table salt ($NaCl$) and standard processed food items.

  • Copper: Essential trace mineral utilized in cellular respiration and iron transport; organ meats represent an especially rich dietary source.