Endoscopic view of the basal lamella.The basal lamella lamella /la·mel·la/ (lah-mel´ah) pl. lamel´lae [L.] 1. a thin leaf or plate, as of bone. 2. a medicated disk or wafer to be inserted under the eyelid. of the middle turbinate turbinate /tur·bi·nate/ (-nat) 1. shaped like a top. 2. any of the nasal conchae. tur·bi·nate or tur·bi·nat·ed adj. 1. Shaped like a top. 2. is actually the third basal lamella of the ethmoturbinals. The insertion of the middle turbinate lies in three different planes. The anterior segment lies sagittally and is attached to the lateral end of the cribriform plate. The middle segment is fixed to the lamina papyracea in an almost frontal plane. The posterior segment--the basal (or ground) lamella-- is attached to the lamina papyracea, the medial wall of the maxillary sinus, or to both to form the roof of the posterior third of the middle meatus (figure). [1,2] The basal lamella of the middle turbinate divides the ethmoid sinuses into anterior and posterior air cells, and it serves as an important landmark during endoscopic en·do·scope n. An instrument for examining visually the interior of a bodily canal or a hollow organ such as the colon, bladder, or stomach. en sinus surgery. Perforation per·fo·ra·tion n. 1. The act of perforating or the state of being perforated. 2. An abnormal opening in a hollow organ or viscus, as one made by rupture or injury. Perforation A hole. through the basal lamella can serve as a route of disease spread from the anterior to the posterior ethmoid sinuses. Variations in the typically flat horizontal bony appearance of the basal lamella can occur secondary to large anterior ethmoid ethmoid /eth·moid/ (eth´moid) 1. sievelike; cribriform. 2. the ethmoid bone; see Table of Bones. .ethmoi´dal eth·moid or eth·moi·dal adj. cells ("pushing" the lamella posteriorly) and to large posterior ethmoid cells ("bulging" the lamella anteriorly). Great care must be taken in appreciating these normal variations when penetrating the basal lamella during posterior ethmoidectomy and sphenoidectomy. The basal lamella provides support for the middle turbinate, so it should never be completely removed because this might lead to a destabilization of the middle turbinate. References (1.) Stammberger HR, Kennedy DW. Paranasal sinuses: Anatomic terminology and nomenclature. The Anatomic Terminology Group. Ann Otol Rhinol Laryngol Suppl 1995;167:7-16. (2.) Stammberger HR. Functional Endoscopic Sinus Surgery functional endoscopic sinus surgery Functional endonasal endoscopic sinus surgery ENT A procedure that removes diseased nasal cavity and paranasal sinus tissue and restores mucociliary clearance Applications Chronic and/or recurrent sinusitis in Pts who fail . The Messerklinger Technique. Philadelphia: B.C. Decker, 1991. |
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