Download superiorly with the parietal bone by the squamosal suture anteriorly

Squamous
tympanic
petrous
styloid process
mastoid process
The squamous plate
form the lateral side of the skull
superiorly with the parietal bone by the squamosal
suture
anteriorly and inferiorly with the greater wing of
sphenoid bone
posteriorly continued with the mastoid process
superior and inferior temporal lines
a single line from the posterior margin of the zygomatic
process of the frontal bone and diverge as they arch
backward
the zygomatic process
projected from its middle part of outer surface
this process with the temporal process of zygomatic bone
formed zygomatic arch.
The temporal fossa
The squamous plate formed the medial wall
laterally zygomatic arch
superiorly superior temporal line
inferiorly infratemporal crest
The inner surface
the lateral wall of the medial cranial fossa with the greater
wing of sphenoid bone and the parietal bone
petrous and the greater wing of sphenoid bone formed the
floor of the medial cranial fossa
On the lateral surface of the squamous tympanic plate
the suprameatal crest
the suprameatal triangle
the suprameatal spine
The mandibular fossa
Anterior to the fossa a small elevation called articular
tubercle
Posteriorly squamotympanic fissure separating the fossa
from the tympanic plate
through the medial end of the fissure, which the chorda
tympani exits from the tympanic cavity
The tympanic part
C shaped on section and forms the bony part of the
external auditory meatus
The petrous
anteriorly by greater wing of sphenoid bone and
separated by groove for the cartilaginous part of the
auditory tube.
Medially bounded by the basilar part of the occipital bone.
Laterally bounded by styloid process.
The foramen lacerum
At the medial end is irregular and, together with greater wing
of sphenoid bone and the basilar part of the occipital bone
close with time by cartilage and fibrous tissue
the apex of the petrous and the sphenoid bone
only a few vessels pass through this foramen from the
medial cranial fossa to the neck.
The carotid canal
On the inferior surface
the side of the foramen lacerum above the closed inferior
opening
The internal carotid artery
an irregularly shaped pyramidal mass
The superior borders of the petrous anteriorly bounded the
middle cranial fossa posteriorly bounded the posterior
cranial fossa anteriorly.
Lateral to the foramen lacerum is an impression on the
apex of the petrous for the trigeminal ganglion.
On the anterior surface are two groove for nerves
the largest medial groove is for the greater petrosal nerve
the smaller lateral groove is for the lesser petrosal nerve
The arcuate eminence
rounded eminence found on the anterior surface of the
petrous and is caused by the underlying superior
semicircular canal.
The internal auditory meatus
At posterior surface
the 7th and 8th cranial nerves
the internal auditory branch of the basilar artery.
Inferomedially the petrous part articulates the condylar
part of the occipital bone except where it forms the
anterolateral boundary of the jugular foramen
the inferior petrosal sinus, 9th, 10, and 11th cranial nerves,
and the sigmoid sinus
the internal ear
The tegmen tympani
laterally formed the roof of middle ear, which is thin
plate of bone
Anteriorly formed the roof of the auditory (Eustachian) tube
posteriorly formed the roof of the mastoid antrum
It separates the middle ear from the middle cranial fossa.
The mastoid antrum
behind the middle ear in the petrous
communicates with the middle ear by aditus
The styloid process
a base, which is embedded between the petrous and
tympanic part
the free portion which is directed downward and forward and
medially for a varying distance
The mastoid process
projects posterior to the styloid process downward and
forward
forward formed the greater part of the subcutaneous
surface of the temporal bone behind the external auditory
meatus
part of the lateral wall of the posterior cranial fossa
grooved by the sigmoid sinus
The mastoid process is undeveloped in the newborn
child and grows only as result of the pull of the
muscle, as the child moves the head.
It can be recognized as a bony projection at the end of
the second year.
Medial to the tip of the mastoid process there is a notch.
The occipital artery lies in a groove medial to the notch.
The superior and posterior borders are serrated and
articulated with the parietal and occipital bones respectively.
The mastoid air cells
a series of communicating cavities within the mastoid
process that are continuous above with the mastoid
antrum and the middle ear
The stylomastoid foramen
The interval between the styloid and mastoid processes
the 7th cranial nerve
the stylomastoid branch of the posterior auricular artery