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Lacrimal Bone

The lacrimal bone a.k.a. os lacrimale is quadrangular and it is the smallest of all bones of the skull. In relation to development, the lacrimal bone is basic as it goes through two stages of development and is created with connective tissue at its center.

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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Structure

The lacrimal bones possess two surfaces as well as four borders. Along with an anterior fossa for lacrimal sac as well as lacrimal hamulus which creates the upper orifice of the nasolacrimal canal with the maxilla, the lateral orbital surface is separated via a vertical posterior lacrimal crest. The medial nasal surface is part of the middle meatus and connects with the anterior ethmoidal air cells.

Lacrimal Bone

Lacrimal Bone

Articulations

The superior border connects with the frontal bone and inferiorly connects with the maxillary orbital surface. The anterior border joins with the frontal process of the maxilla at the lacrimomaxillary suture, while the posterior border joins with the ethmoidal orbital plate.

Lateral or Orbital Surface

  1. A vertical ridge called the posterior lacrimal crest separates the lateral or orbital surface in two parts.
  2. A longitudinal groove known as the lacrimal sulcus (sulcus lacrimalis) is located in front of this crest, the inner margin of which combines with the frontal process of the maxilla, and completes the formation lacrimal fossa.
  3. The upper part of this fossa gives attachment to the lacrimal sac and the lower part gives attachment to the nasolacrimal duct.
  4. The portion is smooth behind the crest as well as creates portion of the medial wall of the orbit.
  5. The crest along with a part of the orbital surface is located immediately behind it and the lacrimal part of the Orbicularis oculi originates from it and terminates below, in the lacrimal hamulus which is a small hook-like projection, which articulates with the lacrimal tubercle of the maxilla, and completes the upper orifice of the nasolacrimal canal.
  6. The hamulus is occasionally found as a separate section and then it is known as the lesser lacrimal bone.

Medial or Nasal Surface

Equivalent to the crest on the lateral surface, the medial or nasal surface has a longitudinal trough.

Part of the middle meatus of the nose is created by the area in front of this furrow; which at the back of it joins with the ethmoid, and concludes some of the anterior ethmoidal cells.

Borders

Of the four borders:

  • The anterior joins with the frontal process of the maxilla.
  • The posterior with the lamina papyracea of the ethmoid.
  • The superior with the frontal bone.
    The inferior is divided by the lower edge of the posterior lacrimal crest into two parts.
  • The posterior part joins the orbital plate of the maxilla.

As the descending process, the anterior is extended downward, which joins with the lacrimal process of the inferior nasal concha, and helps in creating the canal for the nasolacrimal duct.

Development

The ossification of lacrimal is carried out from a single center in the membrane enclosing the cartilaginous nasal capsule which appears around the twelfth week.

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By Dr. Joseph H Volker | 2018-08-30T10:10:07+00:00 August 8th, 2018|Anatomy, Bones and Cartilages, Head and Neck|0 Comments