G52: Nasal Cavity Flashcards
General function of the nose
respiration, olfactory, filtration, humidify, warm and slow inspired air, receive secretions from sinuses
Root of nose
attached to face
Apex of nose
inferior tip of nose
dorsum of nose
extends from root to apex
the bridge of the nose is composed of what bony structures
nasal bones, frontal processes of maxilla, nasal part of frontal
5 hyaline cartilages forming nose
2- alar, 2-lateral, septum connected via perichondrium and periostium continuity
Bones of nasal septum and cartilage
perpendicular plate of ethmoid, vomer (palatine and maxilla nasal crest) and septal cartilage
CSF rhinorrhea
fracture to ethmoidal cribiform plate due to blow to nose, bony nasal septum pushes into cribiform plate (clear, watery discharge), flow changes with posture changes
Anterior nares and piriform aperture
opens nose to exterior
Opening into the nasopharynx posteriorly
Choanae
Vestibule
dilated portion (where finger inserts), contain skin and course hairs (vibrissae)
Vibrissae
course nose hairs in vestibule, filter foreign matter
Olfactory region of nasal cavity
Superior 1/3 of cavity; olfactory epithelium
Respiratory region of nasal cavity
inferior 2/3 of nasal cavity; respiratory epithelium for warming and moistening air
Medial wall of nasal cavity
smooth nasal septum; vomer, perpendicular plate of ethmoid, septal cartilage covered by mucous membranes
Floor of nasal cavity
palatine process of maxilla and horizontal plate of palatine covered with mucous membranes
Roof of the nasal cavity
frontonasal, ethmoidal, and sphenoidal parts
Lateral wall of nasal cavity
3 longitudinal concha (or turbinate bones) covered with mucous membranes
Superior nasal concha
small, rounded, ethmoid bone
Middle nasal concha
larger, ethmoid bone
Inferior nasal concha
largest, individual bone
Nasal meatus
Opening inferior and lateral to each nasal concha; receives ostium and secretions from parasinuses and nasolacrimal ducts
Superior meatus
receives ostium of posterior ethmoidal sinus
Middle meatus
ethmoidal bulla (elevation) from ostium for the middle ethmoidal sinuses; semilunar hiatus
Semilunar hiatus
ostia for anterior ethmoidal sinus, frontal snus, maxillary sinus
Inferior meatus
ostium for nasolacrimal duct