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Oral Histology and E
Oral Histology and Embryology Vocabulary
Term | Definition |
---|---|
Alveolar cres | Highest point of the alveolar ridge |
Alveolar socket | Cavity within the alveolar process that surrounds the root of a tooth. |
Ameloblasts (uh-MEL-oe-blasts | Cells that form enamel |
Anatomical crown | Portion of the tooth that is covered with enamel. |
Apex | Tapered end of each root tip. |
Apical foramen | Natural opening in the root |
Cementoblasts (se-MEN-toe-blasts) | Cells that form cementum. |
Cementoclasts (se-MEN-toe-klasts) | Cells that resorb cementum |
Cementum | Specialized, calcified connective tissue that covers the anatomic root of a tooth. |
Clinical crown | That portion of the tooth that is visible in the oral cavity. |
Conception | Union of the male sperm and the female ovum. |
Coronal pulp | Part that lies within the crown portion of the tooth |
Cortical plate | Dense outer covering of spongy bone that makes up the central part of the alveolar process. |
Dental lamina | Thickened band of oral epithelium that follows the curve of each developing arch. |
Dental papilla | Gingivae between the teeth. |
Dental sac | Connective tissue that envelops the developing tooth. |
Dentin | Hard portion of the root that surrounds the pulp and is covered by enamel on the crown and by cementum on the root. |
Dentinal fibe | Fibers found in dentinal tubules. |
Fibers | Microscopic canals found in dentin. |
Deposition | The process by which the body adds new bone. |
Embryo | An organism in the earliest stages of development |
Embryology (em-bree-OL-uh-jee) | The study of prenatal development. |
Embryonic (em-bree-ON-ik) period | Stage of human development that occurs from the beginning of the second week to the end of the eighth week |
Enamel lamellae | Thin, leaflike structures that extend from the enamel surface toward the detinoenamel junction and consist of organic material with little mineral content. |
Enamel organ | Part of a developing tooth destined to produce enamel. |
Enamel spindle | The ends of odontoblasts (dentin-forming cells) that extend across the detinoenamel junction a short distance into the enamel. |
Enamel tufts | The hypocalcified or uncalcified ends of groups of enamel prisms that start at the detinoenamel junction and may extend to the inner third of the enamel. |
Exfoliation (eks-foe-lee-AY-shun) | The normal process of shedding the primary teeth. |
Fetal period | Stage of human development that starts at the beginning of the ninth week and ends at birth. |
Fibroblast | Type of cell in connective tissue responsible for the formation of the intercellular substance of pulp. |
Gestation (jes-TAY-shun) | Stage of human development that starts at fertilization and ends at birth. |
Histology (his-TOL-uh-jee) | The study of the structure and function of body tissues on a microscopic level. |
Hunter-Schreger bands | Alternating light and dark bands in the enamel that are produced when enamel prisms intertwine or change direction. |
Hydroxyapatite | Mineral compound that is the principal inorganic component of bone and teeth. |
Hyoid arch | The second branchial arch, which forms the styloid process, stapes of the ear, stylohyoid ligament, and part of the hyoid bone. |
Lamina dura | Thin, compact bone that lines the alveolar socket; also known as the cribriform plate. |
Lining mucosa | Mucous membrane that covers the inside of the cheeks, vestibule, lips, soft palate, and underside of the tongue and acts as a cushion for underlying structures. |
Mandibular (man-DIB-yoo-lur) arch | The lower jaw. |
Masticatory (MAS-ti-kuh-tor-ee) mucosa | Oral mucosa that covers the hard palate, dorsum of the tongue, and gingiva. |
Meiosis (mye-OE-sis) | Reproductive cell production that ensures the correct number of chromosomes. |
Modeling | Bone changes that involve deposition and resorption of bone and occur along articulations as they increase in size and shape to keep up with the growth of surrounding tissues; also known as displacement. |
Odontoblasts (o-DON-to-blasts) | Cells that form dentin. |
Odontogenesis (o-don-to-JEN-eh-sis) | Formation of new teeth. |
Osteoblasts (OS-tee-oe-blasts | Cells that form bone. |
Osteoclasts (OS-tee-oe-klasts) | Cells that resorb bone. |
Periodontium (per-ee-oe-DON-shee-um | Structures that surround, support, and are attached to the teeth. |
Preimplantation period | Stage of development that occurs during the first week after fertilization. |
Prenatal (pree-NAY-tul) development | Stage of human development that starts at pregnancy and ends at birth. |
Primary cementum | Cementum that covers the root of the tooth and is formed outward from the cementodentinal junction for the full length of the root. |
Primary dentin | Dentin that forms before eruption and that makes up the bulk of the tooth. |
Primary palate | The shelf that separates the oral and nasal cavities. |
Prism | A calcified column or rod. |
Pulp chamber | The space occupied by pulp. |
Radicular pulp | The other portion of pulp known as root pulp. |
Remodeling | Growth and change in shape of existing bone that involves deposition and resorption of bone. |
Resorption (ree-SORP-shun) | The body’s processes of eliminating existing bone or hard tissue structure. |
Secondary cementum | Cementum that is formed on the apical half of the root; also known as cellular cementum. |
Secondary dentin | Dentin that forms after eruption and continues at a very slow rate throughout the life of the tooth. |
Secondary palate | The final palate formed during embryonic development. |
Specialized mucosa | Mucous membrane on the tongue in the form of lingual papillae, which are structures associated with sensations of taste. |
Stomodeum | The primitive mouth. |
Stratified squamous (SKWA-mus) epithelium | Layers of flat, formed epithelium. |
Striae of Retzius | Incremental rings that represent variations in deposition of the enamel matrix during tooth formation. |
Succedaneous (suk-se-DAY-ne-us) teeth | Permanent teeth that replace primary teeth. |
Tertiary dentin | Dentin that forms in response to irritation and appears as a localized deposit on the wall of the pulp chamber; also known as reparative dentin. |
Tooth buds | Enlargements produced by the formation of dental lamina. |
Zygote | Fertilized egg. |