x
Search
Exact matches only
Search in title
Search in content
Search in excerpt
Search in comments
Filter by Custom Post Type
feedback

Temporal Bone

It is situated on every side in the base and side of the skull and is an uneven pneumatic bone.

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
-
Related:   Differences Between The Left And Right Lungs

Please hover over the figure to get a brief info about the body parts. To get the elaborated info click on the body part.
 
Please rotate the device for better visual interaction.
 

 

Temporal Bone

Temporal Bone

Parts

It consists of the 4 subsequent morphological parts:

  • Squamous part
  • Petromastoid part
  • Tympanic part
  • Styloid process

Squamous Part

It projects upwards to create the side of the skull. It’s thin, translucent, shell-like plate of bone. It presents external and internal surfaces; and superior and anteroinferior border and zygomatic process.

External surface creates the floor of temporal fossa and is grooved in its center by the middle temporal artery.
The zygomatic process projects laterally from the lower and anterior parts of the temporal surface. To create the zygomatic arch it joins the temporal process of the zygomatic bone.
A deep cavity behind the articular eminence is known as mandibular fossa. The mandibular fossa and articular tubercle are essential portions of the squamous part of the temporal bone.

Internal surface is located in contact together with the temporal lobe of the brain. It’s grooved by the anterior and posterior branches of the middle meningeal artery.

Petromastoid Part

For the benefit of convenience of description, the petromastoid part is usually split into 2 parts: mastoid part and petrous part.

1. Petrous part: It’s the most challenging (rock like) part of the temporal bone and includes inside it: internal ear, middle ear and mastoid antrum, which it safely shields. It also includes carotid canal for internal carotid artery.

Related:   Infraorbital Artery

The petrous part has a shape of a 3 dimensional pyramid. It’s a base, an apex, 3 surfaces and 3 edges.

  1. The base is fused with the squamous part.
  2. The apex creates the posterolateral wall of the foramen lacerum.
  3. Anterior surface creates the posterior part of the middle cranial fossa. It presents 5 features.
  4. Posterior surface creates the anterior wall of the posterior cranial fossa. It presents 3 features.
  5. Inferior surface is viewed in the base of the skull. It is located between the greater wing of sphenoid and basilar part of the occipital bone. It presents the lower opening of the carotid canal, jugular fossa, tympanic canaliculus and a triangular depression in front of the jugular fossa.
  6. The triangular depression in front of the jugular fossa lodges inferior ganglion of glossopharyngeal nerve. The apex of fossa presents an opening, which leads into a bony canal, the cochlear canaliculus that is traversed by aqueduct of cochlea/perilymphatic duct.
  7. Superior border: it’s a long sharp crest which intervenes between middle and posterior cranial fossae. It’s grooved by superior petrosal sinus. Its medial end is crossed by abducent nerve deep to petrosphenoid ligament (ligament of Gruber).
  8. Anterior border: its medial part articulates with greater wing of sphenoid and creates sulcus tubae on the undersurface of the base of the skull. Its lateral part joins squamous part at petrosquamosal suture.
  9. Posterior border: its medial part articulates with all the basilar part of the occipital bone and creates a groove which lodges the inferior petrosal sinus. Its lateral part creates the superolateral boundary of the jugular foramen.

2. Mastoid part: It is located below and behind the squamous part and includes mastoid antrum, which interacts with the middle ear cavity in the petrous part of the temporal bone. It finishes below as mastoid process. It encloses the mastoid air cells. On the medial side of the mastoid process there’s a notch referred to as digastric notch for connection to the posterior belly of digastric muscle.

Related:   Nerves of Foot

Mastoid air cells: The mastoid process is made up of cortex of compact bone using a honeycomb of air cells underneath it. The air cells are small intercommunicating spaces that are constant with the mastoid antrum and middle ear.

Contingent on the air cell development (pneumatization), the subsequent 3 types of mastoid processes are described:

  1. Pneumatic or cellular mastoid process: In this, air cells are well-developed and the intervening septa are thin.
  2. Diploeic or miscellaneous process: The process is made of narrow spaces and few air cells.
  3. Sclerotic or acellular process: There are really no cells or narrow spaces in the mastoid process. The antrum is small and sigmoid sinus is interposed.

Clinical Significance

Middle ear infections frequently spread into mastoid antrum and mastoid air cells to cause mastoiditis and mastoid abscess.

Tympanic Part

It’s a thin, triangular curved plate of bone which creates the floor and anterior wall of the external auditory meatus. The anterior surface of the tympanic part creates the non-articular part of the mandibular fossa and is linked to the part of the parotid gland

Styloid Process

It’s a thin bony projection of about 1 inch length. It goes downward and forward from the under surface of the tympanic plate. It’s crossed externally by the facial nerve.

External acoustic meatus (bony part) opens on the surface behind the mandibular fossa below the posterior part of the posterior root of zygoma and creates about 2 third of the absolute length of the external auditory meatus.
The suprameatal triangle (McEwen’s triangle) is a small depression posterosuperior to the external acoustic meatus.

At birth, the tympanic cavity, tympanic membrane, mastoid antrum, ear ossicles and internal ear; all are of the mature size.


Rate this Article: 1 Star2 Stars3 Stars4 Stars5 Stars (50 votes, average: 4.68 out of 5)
Loading...

By | 2018-08-08T00:00:00+00:00 August 8th, 2018|Anatomy, Bones and Cartilages, Head and Neck|0 Comments