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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
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Epistaxis, or nosebleeds, occurs when small, swollen blood vessels in the nasal mucous membrane rupture. Typically, the anterior septum is the primary site of occurrence.
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The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
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Impact of Nasal Trauma on Olfactory Function.

Süleyman Emre Karakurt1, Zekiye Orhan1, Mehmet Fatih Karakus1

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Journal of the College of Physicians and Surgeons--Pakistan : JCPSP
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Nasal trauma can impair smell, but only if a nasal fracture is present. Non-fracture nasal trauma did not significantly affect olfactory function in this study.

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Trauma Surgery

Background:

  • Olfactory dysfunction is a common consequence of head and facial trauma.
  • The specific impact of nasal trauma, with or without fracture, on olfactory function requires further elucidation.

Purpose of the Study:

  • To investigate the relationship between nasal trauma, nasal fractures, and olfactory function.
  • To differentiate the effects of traumatic nasal injuries with and without bone fracture on smell.

Main Methods:

  • A descriptive analytical study was conducted involving 113 participants (83 with nasal trauma, 30 controls).
  • Nasal trauma patients were categorized into fracture (Group F) and non-fracture (Group Non-F) groups.
  • Olfactory function was assessed using the Sniffin' Sticks test, with statistical comparisons using t-tests, Mann-Whitney U-test, and Chi-square tests.

Main Results:

  • Patients with nasal fractures (Group F) exhibited significantly lower olfactory scores (TDI) compared to controls.
  • No significant difference in olfactory scores was observed between the non-fracture nasal trauma group (Group Non-F) and controls.
  • A significant difference in the prevalence of olfactory dysfunction was found between Group F and Group Non-F.

Conclusions:

  • Nasal trauma can lead to olfactory dysfunction, but this is contingent upon the presence of a nasal fracture.
  • Injuries to the nasal bone are a critical factor in the development of post-traumatic smell disorders.