Inclusive Anatomy
Structure:
The anterior inferior part of the nasal septum is a highly vascularized region located on the anterior portion of the nasal septum, where the mucosa is thin, and the underlying blood vessels lie close to the surface.[1] This region contains a dense arterial network formed by the anastomoses of five arteries: the anterior ethmoidal artery, posterior ethmoidal artery, sphenopalatine artery, greater palatine artery, and superior labial artery.[1]
Structurally, this region overlies the cartilaginous portion of the nasal septum and is covered by a thin mucosal layer containing submucosal glands and an extensive capillary network.[2] The convergence of multiple arterial sources within a confined area makes this region a critical site for nasal vascular dynamics. In addition to its vascular role, the location of this plexus contributes to the warming and humidification of inspired air as it passes through the nasal cavity.[2]
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Function:
The anterior inferior part of the nasal septum plays an important role in nasal physiology through its contribution to air conditioning and mucosal perfusion. However, due to the superficial position of its blood vessels and constant exposure to environmental airflow, this region is particularly susceptible to trauma and irritation.[2]
As a result, it is the most common site of origin for anterior epistaxis. Factors contributing to bleeding include mechanical trauma such as nose picking or facial injury, environmental conditions such as low humidity and airborne irritants, and systemic factors including hypertension and coagulation disorders.[2,3] The dense vascular network within this region explains both its physiological importance and its clinical vulnerability.
References:
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Moore KL, Dalley AF, R. AAM. Clinically Oriented Anatomy. Philadelphia etc.: Wolters Kluwer; 2018.
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Tabassom A, Dahlstrom JJ. Epistaxis. In: StatPearls. Treasure Island: StatPearls Publishing 2022.
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Krulewitz NA, Fix ML. Epistaxis. Emerg Med Clin North Am. 2019;37(1):29-39. doi:10.1016/j.emc.2018.09.005
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