Rh i noplasty Flashcards
Skin: Thicker over the upper and lower third of the nose and thinner over the middle third muscle-osseocartilaginous framework
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The nasal veins do not have valves
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The nasal venous system has direct communication to the
cavernous sinus, thus making nasal infections potentially a
life-threatening event
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Trigeminal-ophthalrnic-nasociliary-anterior ethmoid: supplies
the anterior halfofnasal cavity
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External branch of the anterior ethmoid: supplies the nasal
skin from rhinion to tip
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Posterior ethmoid: supplies the superior half of nasal cavity
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Mucosa (lining of vestibule )
The vestibule is lined by hair-bearing squamous epithelium up
to the level of the caudal margin of the alar cartilage
where
it transitions to pseudostratified ciliated columnar respiratory
epithelium with abundant seromucinous glands
Anatomic dome
The area of transition between the medial and lateral crura of the alar/lower lateral cartilage. The anatomic dome usually but not always
corresponds to the most projecting point of the nasal tip (the clinical dome)
Columellar labial angle vs Columellar lobular angle
Columellar labial angle: Formed by the angle between the columella and the upper lip. Th.is angle is not dependent on the nasal base position, as in the nasolabial
angle
Columellar lobular angle: The angle formed at the junction of the columella and the infratip lobule. The angle is usually 35°-45° in females and 0°-35° in males.
Dorsal aesthetic lines: Imaginary lines starting at the medial edge of the brows and tracing a gentle curve down the lateral side ofthe dorsum to the tip-defining
points
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Infratip lobule: Transition area between the tip (domes) and the columella
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the Frankfort Horizontal line
the plane defined by a 90° plane from the vertical facial plane, with the line
drawn from the inferior portion of the external auditory canal to the bony inferior orbital rim
Pogonion: The most anterior projection ofthe mandible as seen on a cephalogram
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Scroll area: The area where the cephalic edge of the lower lateral cartilage interlocks with the caudal edge of the upper lateral cartilage
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Tip projection
(A) the length from the nasal base crease to the tip on the lateral view and (B) the length of the nose on the lateral view from the radix to nasal tip.
A should be about 0.67 the length of (B divided by A = 0.67)
The use of computer imaging can help to determine the types of
changes that can reasonably be made,
T It is important to stress to the patient that
computer-imaged results cannot be construed as a guarantee of that
exact result
Nasal Analysis DON BY ?
Byrd analysis
computer imaging
Byrd analysis
looks at idealized relationships between nasal
landmarks. Comparison of these idealized measurements with the
patient’s actual measurements suggests quantifiable changes that can
be made in that patient’s nose
Midline facial vertical This line can be used to help
determine nasal symmetry in the anterior-posterior view
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Bony base width; This distance should be roughly
80% of the distance between the medial canthi
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the supratip break, tip-defining points, and columellar lobular angle are used to define two opposing triangles over
the tip of the nose. The intersecting bases of these triangles form
a horizontal line through the tip-defining points. These triangles
should be roughly symmetrical
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The nostrils should be roughly teardrop shaped with the base wider than the apex and with the axis
oriented in a slight medial direction from based apex.
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radix to tip = stomion to the menton
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The apparent length of the nose can be
changed how ?
by changing the position ofthe nasal frontal angle or the
tip-defining point
more anterior position ofthe nasal frontal angle can
make the nasal tip look less projecting while a more posterior or
deeper position for the nasal frontal angle can make the nasal tip
look relatively more projecting.
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