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Parietal Bone

The parietal bone creates the major portion of the vault of the skull and is a curved plate of bone. It’s quadrilateral in shape.

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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Parts

The parietal bone has:

  • 2 surfaces: external and internal.
  • 4 edges: superior (sagittal), inferior, anterior and posterior.
  • 4 angles: frontal, sphenoidal, occipital and mastoid.

Surfaces

The 2 surfaces of the parietal bone are as follows:

External surface: It’s most notable attribute of the surface that it is smooth and convex and is located near its center an elevation named parietal eminence or parietal tuberosity or parietal tuber. There are just two curved lines referred to as superior and inferior temporal lines, below the parietal tuberosity. The parietal foramen is situated near the posterior part of the superior border.

Internal surface: It’s concave and overlies the parietal lobe of the cerebral hemisphere.

It presents these features:

  • Sagittal sulcus (only half) along the superior border, which lodges superior sagittal sinus.
  • Granular stone by the side of sagittal sulcus, which lodge the arachnoid granulations.
  • Deep groove instantly behind the anterior border, which lodges the anterior branch of the middle meningeal artery.
  • An opinion for posterior section of middle menin-geal artery, which runs upwards from the middle of the lower border.
  • Transverse sulcus across the posteroinferior angle, which lodges the sigmoid sinus.

Borders

The 4 Borders of the parietal bone are as follows:

  • Superior (sagittal) border: articulates with quite similar border of opposite parietal bone to create sagittal suture.
  • Inferior (squamosal) border: articulates with 3 bones. From anterior to posterior, these are: (a) greater wing of sphenoid bone, (b) squamous part of temporal bone and (c) mastoid portion of the temporal bone.
  • Anterior (frontal) border: articulates with all the frontal bone to create the coronal suture.
  • Posterior (occipital) border: articulates with all the squamous part of the occipital bone to create the lambdoid suture.

Angles

The 4 angles of the parietal bone are as follows:

  1. Anteroinferior (sphenoidal) angle – is located at pterion
  2. Anterosuperior (frontal) angle – is located at the bregma
  3. Posteroinferior (mastoid) angle – is located at the asterion
  4. Posterosuperior (occipital) angle – is located at lambda

The anteroinferior (sphenoidal) angle projects down-wards and forwards to a substantial extent.

Clinical Significance

Sometimes, the parietal bone is split into 2 parts: upper and lower by an anomalous anteroposterior suture. The physician may mistake this state using a fracture. But it can be ruled out easily as the anomalous parietal suture is bilateral.

The regenerating ability of parietal bone is quite poor because of deficiency of cambium layer in the periosteum.


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By | 2018-02-14T10:06:01+00:00 July 24th, 2017|Anatomy, Bones and Cartilages, Head and Neck|0 Comments