Anatomy Bones and Muscles · MU Pleven

204. Regio nasalis, regio oralis.

Covers the boundaries of the nasal region, the parts of the external nose, and the nasal cavity with its conchae and meatuses, including which paranasal sinuses and ducts open into each meatus. Also sets out the walls, ceiling, floor and septum of the cavity, illustrated by oblique and sagittal sections, and closes with two clinical notes on cerebrospinal fluid leakage from the nose and bleeding from Kiesselbach's plexus.

Inside: 2 sections · 4 labelled pictures · 16 flashcards · 3 min

Topic 203 of 236 in the MU Pleven syllabus for Anatomy Bones and Muscles (Medicine, Year 2). The free AceMed note covers it in 2 sections, about 486 words (3 min of reading), with 16 flashcards.

In this note

  1. NASAL REGION
  2. Nasal Cavity:

NASAL REGION

The nasal region is demarcated superior-ly by the line connecting the medial ends of the eyebrows, inferiorly by a horizontal line passing through the lowest point of the nasal septum, and laterally by the na-sobuccal sulcus.

  1. The external nose consists of bony and cartilaginous parts, which can be distinguished by palpation: the bony nose is rigid, while the cartilaginous one is flexible. The parts of the external nose—radix, dorsum, apex, alae and nares—are easily observed.

Nasal Cavity:

Nasal conchae and meatuses

The location of the paranasal sinuses and their openings

Conchae

  1. 1 Superior nasal concha
  2. 2 Middle nasal concha
  3. 3 Inferior nasal concha

Meatuses and openings of the paranasal sinuses

  1. 4 Superior nasal meatus – is located between the ceiling of the nasal cavity and middle nasal concha
  2. 4.1 Sphenoidal sinus
  3. 4.2 Posterior ethmoidal cells
  4. 5 Middle nasal meatus – is located between the middle and inferior nasal concha
  5. 5.1 Anterior and middle ethmoidal cells
  6. 5.2 Frontal sinus
  7. 5.3 Maxillary sinus
  8. 6 Inferior nasal meatus – is located between the inferior nasal concha and the floor of the nasal cavity
  9. 6.1 Nasolacrimal duct
  10. 7 Common nasal meatus – is located between the medial edges of the nasal conchae and the nasal septum
  11. 8 Nasopharyngeal meatus – is located between the dorsal edges of the nasal conchae and the choanae

The nasal cavity is a segmented air-filled space located behind the nose. It consists of the nasal vestibule and the bony nasal cavity. It is divided into left and right parts by the nasal septum. The lateral walls of the nasal cavity are the medial walls of the orbits. The nasal conchae project into the nasal cavity from the lateral wall.

Boundaries

Oblique section of the nasal cavity

Sagittal section of the nasal cavity

  1. 1 Ceiling
  2. 1.1 Septal nasal cartilage – lateral process
  3. 1.2 Nasal bone
  4. 1.3 Nasal part of frontal bone
  5. 1.4 Cribriform plate of ethmoidal bone
  6. 1.5 Body of sphenoid bone
  7. 2 Floor
  8. 2.1 Incisive bone
  9. 2.2 Palatine process of maxilla
  10. 2.3 Horizontal plate of palatine bone
  11. 3 Lateral wall
  12. 3.1 Nasal bone
  13. 3.2 Frontal process of maxilla
  14. 3.3 Nasal surface of maxilla
  15. 3.4 Inferior nasal concha
  16. 3.5 Lacrimal bone
  17. 3.6 Ethmoidal labyrinth
  18. 3.7 Perpendicular plate of palatine bone
  19. 3.8 Medial plate of pterygoid process of sphenoid
  20. 4 Nasal septum
  21. 4.1 Bony part
  22. 4.1.1 Vomer
  23. 4.1.2 Perpendicular plate of ethmoidal bone
  24. 4.2 Cartilaginous part
  25. 4.2.1 Septal nasal cartilage
  26. 4.3 Membranous part

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