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Nasal Bone

Each one of the nasal bone has four bones, which create joints: two cranium as well as two facial bones.

The cranium bones: the ethmoid and frontal.

The facial bones: the maxilla and opposite nasal.

Each nasal bone has four borders: the superior, inferior, lateral, and medial. Each nasal bone has two surfaces: the outer and the inner.

Interactive Anatomical Interface

Highlight
Frontal
parietal
Temporal
Sphenoid
Zygomatic
maxilla
Nasal
Lateral cartilage
greater alar cartilage
Mandbile
thyrohyoid membrane
thyroid cartilage
cricoid cartilage
cricotracheal ligament
ANterior longitudinal ligament
teeth
cervical vertabrae
first rib
second rib

Highlight
Frontal
parietal
Temporal
Sphenoid
Zygomatic
maxilla
Nasal
Lateral cartilage
greater alar cartilage
Mandbile

Highlight
thyrohyoid membrane
thyroid cartilage
cricoid cartilage
cricotracheal ligament
ANterior longitudinal ligament
teeth
cervical vertabrae
first rib
second rib
Highlight
frontal
Parietal
Sphenoid
temporal
Zygomatic
Maxilla
stylomandibular ligament
Lateral cartilage
posterior atlantoaxial ligament
lateral ligament
greater alar cartilage
teeth
mandible
hyoid
occipital bone
first rib
posterior atlanto-occipital memebrane
thyrohyoid membrane
thyroid cartilage
ricothyroid membrane and ligament
cricoid cartilage
cricotracheal ligament
t1 vertebra
stylohyoid ligament
joint capsule
Anterior longitudinal ligamnent
nuchal ligament
Cervical Vertebra
lacrimal

Highlight
frontal
Parietal
Sphenoid
temporal
Zygomatic
Maxilla
Lateral cartilage
greater alar cartilage
mandible
hyoid
thyrohyoid membrane
thyroid cartilage
ricothyroid membrane and ligament
cricoid cartilage
lateral ligament
cricotracheal ligament

Highlight
stylohyoid ligament
Anterior longitudinal ligamnent
nuchal ligament
Cervical Vertebra
first rib
t1 vertebra
lacrimal
occipital bone
teeth
posterior atlanto-occipital memebrane
posterior atlantoaxial ligament
joint capsule
stylomandibular ligament
-
Highlight
nasal
temporal bone
occipital bone
Internal auditory meatus
Stylomastoid foramen
Temporal
sphenoid
ethmoid
zygomatic bone
zygomatic bone
lacrimal bone
perpendicular plate
lacrimal bone
nasal cartilage
vomer
Nasal concha
Mandible
tectorial membrane of atlanto-axial joint
foramen magnum
tectorial membrane
c1 atlas
crista galli
ethmoidal sinuses
cribriform plate
foramen rotundum
optic foramen
superior orbital fissure
palatine
nuchal ligament
c01 atlas
posterior atlantoaxial ligament
c2 axis
c03 vertebrae
c04 vertebrae
C5 vertebrae

Highlight
nasal
temporal bone
occipital bone
Stylomastoid foramen
Temporal
sphenoid
ethmoid
zygomatic bone
zygomatic bone
lacrimal bone
perpendicular plate
posterior atlantoaxial ligament
nasal cartilage
vomer
Nasal concha
palatine
tectorial membrane of atlanto-axial joint

Highlight
foramen magnum
tectorial membrane
c1 atlas
crista galli
lacrimal bone
Mandible
ethmoidal sinuses
cribriform plate
foramen rotundum
Internal auditory meatus
optic foramen
superior orbital fissure
nuchal ligament
c01 atlas
c2 axis
c03 vertebrae
c04 vertebrae
C5 vertebrae
-

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Nasal Bone

Nasal Bone

Relation

  1. Superiorly, in the nasal section the paired nasal bones merge in the midline with each other and with the frontal bone superiorly.
  2. The center of the frontonasal suture is created through the combination of the nasal bones and the frontal bone is the nasion.
  3. All nasal bones and the frontal processes of all maxilla articulate with each other laterally.
  4. Piriform aperture is the large opening located inferiorly within the nasal region and the anterior aperture of the nasal cavity. The nasal bones bounded it superiorly and with each maxilla laterally and inferiorly.
  5. Creating the lower part of the bony nasal septum and terminating anteriorly as the anterior nasal spine and the paired inferior nasal conchae, the fused nasal crests are detectable via the piriform aperture.
Nasal Bone

Nasal Bone

Surface

1. The outer surface of the nasal bone:

  • Covered with the compressor naris and the procerus muscles.
  • Convex shaped from one side to the other and concavo-convex from the top to bottom.

2. The inner surface of the nasal bone travels downward and has a groove that attaches one of the branches of the nasociliary nerve. This surface is concave in shape from one side to the other.

Clinical Significance

Nasal Bone Fracture

Nasal bone fractures are the most frequently occurring variety of facial fractures, it makes approx. 45% of facial fractures, and whenever major facial swelling is found, they are likely to get overlooked.

  • Nasal bone fractures arise when the nose impacts against a solid object.
  • Lateral impact injuries are the most frequent type of nasal injury leading to fracture.
  • Nasal-bone fractures when isolated are most commonly a displaced fracture of one the paired nasal bones.

It is often related to other facial fractures and this requires careful assessment:

  • Nasal septum
  • Orbital blow-out fracture
  • Frontal process of the maxilla

Absent Nasal Bone

An absent nasal bone is a feature which can sometimes be used as an adjunctive marker in fetal sonographic assessment for fetal aneuploidy.

Antenatal Ultrasound

It is evaluated on a midline sagittal view. The nasal bone is frequently seen in this section as a bright echogenic line. It is best visualized near 1st trimester i.e. 11th to 14th weeks of gestation. A magnified image may assist in visualization.

Significance

A follow up scan after a week is advised when the other ultrasound markers and serum biochemistry are normal, but the nasal bone is absent at 11 to 12 weeks.

The incidence of an absent nasal bone is related to:

  • Nuchal translucency
  • Crown rump length
  • Ethnic origin
  • Aneuploidy

It is more common with

  • Increased NT
  • Smaller CRL measurements.
  • In fetuses of Afro-Caribbean parents.

Hypoplasia of Nasal Bone

Hypoplasia of the nasal bone is a sonographic examination, in which the fetal nasal bone seems smaller by altering degrees. Nasal bone hypoplasia has a spectrum in which the comparatively easily recognized absent nasal bone is at one point. Other point of the spectrum is harder to describe, mostly whenever used as a screening device. Compared to 45-63% of fetuses with Down syndrome nearly 0.6-1.4% of normal fetuses are assumed to have a hypoplastic nasal bone on a routine 2nd trimester scan.

Associations

Down syndrome: nasal bone hypoplasia has emerged as one of the strongest morphological markers of trisomy. Until now it is associated to the morphological observation that individuals with Down syndrome have short noses.

Fetal warfarin syndrome is a rare relation.


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By | 2018-02-01T07:46:37+00:00 January 12th, 2018|Anatomy, Bones and Cartilages, Head and Neck|0 Comments