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    From Digestive System

    Sigmoid Colon
    S-shaped final segment of the colon.
    Cheeks
    Lateral walls of the oral cavity composed of muscle and fat.
    Minor Duodenal Papilla
    Opening for accessory pancreatic duct.
    Ileum
    Final and longest portion of the small intestine.
    Cecum
    First part of large intestine.
    Lesser Omentum
    Connects stomach and liver.
    Lower Esophageal Sphincter
    Muscle at the junction of esophagus and stomach.
    External Anal Sphincter
    Voluntary muscle around anus.
    Abdomen
    The abdomen is the body region between the chest and pelvis housing vital digestive, metabolic, and excretory organs, protected by muscular and peritoneal layers.
    Cystic Duct
    Connects gallbladder to common bile duct.
    Accessory Pancreatic Duct
    Secondary duct emptying into duodenum.
    Right Lobe
    Larger functional lobe of the liver.
    Quadrate Lobe
    Small lobe located between gallbladder and round ligament.
    Teniae Coli
    Longitudinal muscle bands of colon.
    Abdominal Cavity
    The abdominal cavity is the largest body cavity, housing vital digestive and excretory organs, lined by the peritoneum and essential for protection, metabolism, and organ movement.
    Jejunum
    Second portion of the small intestine.
    Laryngopharynx
    Lower part of pharynx leading to esophagus.
    Tail of Pancreas
    Tapered end of pancreas near spleen.
    Vermiform Appendix
    Worm-like appendage of the cecum.
    Uvula
    Dangling soft tissue at the back of the soft palate.
    Tongue
    Muscular organ aiding in taste, speech, and food manipulation.
    Submandibular Glands
    Salivary glands beneath the mandible.
    Internal Anal Sphincter
    Involuntary muscle around anal canal.
    Liver
    Largest gland in the body with roles in metabolism and bile production.
    Common Hepatic Duct
    Carries bile from liver to bile duct.

    Gingiva

    Reviewed by our medical team

    Gums; soft tissue covering the bones of the jaw.

    Overview

    The gingiva, commonly known as the gums, is the fibrous tissue that surrounds and protects the teeth and underlying alveolar bone. It forms a vital part of the oral cavity and plays a key role in oral hygiene, mastication, and dental health. As part of the mucosal lining of the mouth, the gingiva acts as both a mechanical and immune barrier to pathogens.

    Location

    The gingiva is located in the oral cavity, specifically:

    • Surrounding the cervical portion of the teeth

    • Overlying the alveolar processes of both the maxilla (upper jaw) and mandible (lower jaw)

    • Extending from the free gingival margin to the mucogingival junction, where it meets the alveolar mucosa

    It is divided into:

    • Free (marginal) gingiva: Forms the soft tissue wall of the gingival sulcus

    • Attached gingiva: Firmly bound to the underlying alveolar bone and tooth cementum

    • Interdental papilla: The gingiva between adjacent teeth, filling the interdental space

    Structure

    The gingiva is composed of specialized mucosa and connective tissue:

    • Epithelium: Stratified squamous epithelium; keratinized in attached and marginal gingiva for increased protection

    • Lamina propria: Dense connective tissue containing collagen fibers, fibroblasts, blood vessels, and immune cells

    • Gingival fibers: A network of collagen fibers (e.g., dentogingival, alveologingival, and circular fibers) that help maintain tissue position and integrity

    The gingiva is richly vascularized and innervated, receiving blood from branches of the facial, maxillary, and lingual arteries, and sensory innervation from branches of the trigeminal nerve.

    Function

    The gingiva serves several essential functions:

    • Protection: Acts as a barrier against mechanical trauma, bacteria, and toxins

    • Tooth support: Anchors the teeth by stabilizing their position within the alveolar bone

    • Sealing mechanism: Forms a tight junction around the tooth to prevent the entry of pathogens

    • Sensory feedback: Provides tactile and pain sensation to detect harmful stimuli

    Physiological Role(s)

    The gingiva plays key roles in oral and digestive physiology:

    • Maintaining oral homeostasis: Supports immune surveillance via lymphocytes and antigen-presenting cells in the lamina propria

    • Gingival crevicular fluid (GCF): A plasma-derived fluid in the gingival sulcus that contains immune cells and enzymes to combat microbial invasion

    • Assisting mastication: Provides a stable platform for efficient chewing and helps direct food away from the gingival margin

    • Healing capacity: Rapidly regenerates after minor injuries, helping maintain oral mucosal integrity

    Clinical Significance

    The gingiva is a focal point in oral and periodontal health. Common clinical issues include:

    • Gingivitis: Inflammation of the gingiva due to plaque accumulation; characterized by redness, swelling, and bleeding

    • Periodontitis: Progression of untreated gingivitis leading to destruction of supporting structures (bone, periodontal ligament), and possible tooth loss

    • Gingival recession: Exposure of tooth roots due to tissue loss, often associated with aggressive brushing or periodontal disease

    • Gingival hyperplasia: Overgrowth of gum tissue caused by medications (e.g., phenytoin, cyclosporine), inflammation, or hormonal changes

    • Gingival abscess: A localized infection in the gingival tissue, often due to trapped debris or trauma

    • Oral cancers: Malignant lesions can occur in the gingiva, requiring biopsy and early intervention

    Prevention of gingival disease relies on proper oral hygiene, regular dental care, and management of systemic conditions that affect periodontal health.

    Did you know? The pancreas helps with digestion by releasing enzymes that break down fats, proteins, and carbohydrates.