← Oral Histo Exam 1 Test
5 Written Questions
5 Matching Questions
- Seperation of 1st branchial arch
- Lateral plate mesoderm
- Junctional Epithelium
- Cartilage of 3rd branchial arch
- a Board question. This epithelium is derived from reduced enamel epithelium of tooth germ.
It contains flat cells aligned parallel to tooth surface increasing in thickness from APEX TO CROWN.
Attached to enamel by internal basal lamina and to CT by external basal lamina*****
Hemidesmosomes on both basal laminas.
JXNIONAL epithelium rapidly regenerates from sulcular or oral epithelium if damaged!!!!!
CT has higher neutrophils compared to rest of oral mucosa.
- b This is a tumor of odontogenic epithelium that may arise from cell rests of enamel or enamel organ
- c This branchial arch seperates into a maxillary process and mandibular arch. 1st branchial groove BELOW Mn arch!!!!
- d this cartilage forms inferior of body and greater horns of hyoid.
- e Forms CT of muscle and viscera, serous membranes of pleura, pericardium, peritonuem, blood and lymphatic cells, cardiovascular and lymphatic, spleen and adrenal cortex
5 Multiple Choice Questions
- This is composed of salivary glands, sebaceous glands (fordyce's spots) and lymphoid tissue (tonsillar)
- Defects in 1st and 2nd branchial arch
congenital auricular sinuses/cysts
branchial cysts, sinuses, fistulas, vestiges (bone and cartilage remnants)
- Stages of apposition:
IDE's needs for odontoblasts to function!
Elongation of IDE
Differentiation of odontoblasts
Formation of dentin
Formation of enamel
- Face and brain are supplied first by internal carotid-------then facial vessels detch from internal and attach to external.
- Explanation of a structures red color:
1. Thin epithelium
2. Epithelium contains ELEIDIN, which is transparent and present in stratum lucidum clear semi-fluid
3. Blood vessels present near surface.
5 True/False Questions
Muscles of mastication 1st arch → at 7 weeks, the 2nd arch ,muscles grow upward to form muscles of facial expression.
Cap Stage Characterized → This stage is condensation of ectomesenchyme immediately subjacent to the tooth bud caused by lack of extracellular matrix secretion by the cells thus preventing separation. HISTODIFFERENTIATION begins at end of cap stage.
Inner and outer D. epithelium forming
trunk paraxial mesoderm → This ruptures at 24 to 26 days!!!!!!!
Components of Lining mucosa → This oral epithelium has:
1. Stratum basale: Basal layer cuboidal cells (progenitor)
2. Stratum spinosum: Oval cells - bulk of epithelia
3. Stratum Superficiale: flat cells containing small oval nuclei continuously shed...
Stellate reticulum → These are star shaped cells with processes, present between the outer and inner dental epithelium. Secrete glycosaminoglycans., which attract water, swell cells and push apart.