Boundaries. Medial: frontal bone, parietal bone, temporal bone, and sphenoid bone. Anterior: Posterior surface of the frontal process of the zygomatic bone and the posterior surface of the zygomatic process of the frontal bone.
What are the boundaries of temporal fossa?
The temporal fossa is bounded by a few anatomical landmarks, anteriorly the frontal process of the zygomatic bone, superiorly and posteriorly the temporal lines, and inferiorly the zygomatic arch.
Where are the temporal lines located?
The superior temporal line is an arching ridge along the lateral surface of the skull; it begins as a continuation of the upper posterior border of the zygomatic bone and continues as a broad arch along the frontal and parietal bones, above and roughly parallel to the upper edge of the temporal bone.
What bones make up the temporal fossa?
The bony part of the temporal fossa is formed anteriorly by the zygomatic bone, somewhat more posteriorly by the greater wing of the sphenoid, and still farther posteriorly by the temporal squama. But the upper margin of the temporal muscle is applied to the squama of the frontal bone and to the parietal bone.What forms the floor of temporal fossa?
The floor of the temporal fossa is formed by the bones of the side of the head that is portions of the frontal, sphenoid, temporal, and parietal bones.
What do you mean by temporal fossa?
The temporal fossa is a fossa (shallow depression) on the side of the skull bounded by the temporal lines and terminating below the level of the zygomatic arch.
Where is temporal fossa located?
The temporal fossa is a depression on the temporal region and one of the largest landmarks on the skull. The temporal bone, the sphenoid bone, the parietal bone and the frontal bone contribute to its concave wall. It is superior to the infratemporal fossa which lies beneath the zygomatic arch.
What bones does the temporal bone articulate with?
The temporal bone articulates anteriorly with the sphenoid bone, above with the parietal bone, and posteriorly with the occipital bone. The zygomatic process of the squamosal part has an anterior and a posterior root between which, on the lower surface, is located the mandibular canal.What are the three parts of the temporal bone?
- squamous part (temporal squama)
- petrous part (petrous pyramid)
- tympanic part.
- mastoid part (usually considered a separate part but it is formed by both the squamous and petrous parts)
The mastoid part is the most posterior part of the temporal bone. Its outer surface is roughened by muscular attachments. There is a downward conical projection called the mastoid process from the mastoid part.
Article first time published onWhere are the superior and inferior temporal lines located?
Superior and inferior temporal lines arecrossing the middle of the bone in an arched direction in two curved lines. The former gives attachment to the temporal fascia, and the latter indicates the upper limit of the muscular origin of the Temporalis.
What are temporal lines?
Medical Definition of temporal line : either of two nearly parallel ridges or lines on each side of the skull that begin as a single ridge on the temporal bone, run upward and backward from the zygomatic process above the temporal fossa, divide into upper and lower lines, and continue on the parietal bone.
On which two bones do we find the temporal line?
Running upward and backward from the zygomatic is a well-marked line, the temporal line, which divides into the upper and lower temporal lines, continuous, in the articulated skull, with the corresponding lines on the parietal bone.
What is in the anterior cranial fossa?
The anterior cranial fossa is formed by the orbital part of the frontal bone, the cribriform plate and crista galli of the ethmoid bone, and the lesser wings and anterior part of the body (jugum sphenoidale and prechiasmatic sulcus) of the sphenoid bone (Standing, 2015).
What is a fossa in human anatomy?
Fossa – A shallow depression in the bone surface. Here it may receive another articulating bone or act to support brain structures. Examples include trochlear fossa, posterior, middle, and anterior cranial fossa.
Where is the middle cranial fossa?
(Middle cranial fossa is the centermost of the three indentations, in pink and yellow.) The middle cranial fossa, deeper than the anterior cranial fossa, is narrow medially and widens laterally to the sides of the skull. It is separated from the posterior fossa by the clivus and the petrous crest.
What are the four regions of the temporal bone?
- the squamous region, which is the largest.
- the mastoid region.
- the petrous region.
- the tympanic region.
What is the fossa located on the temporal bone that articulates with the mandible?
The mandibular fossa (glenoid fossa) is an oval depression behind the anterior root of the zygomatic process of temporal bone for the reception of the condyle of the mandible.
How many temporal lobes are there?
As with the frontal, occipital, and parietal lobes, there is one temporal lobe located in each brain hemisphere.
Which areas of the skull are formed in part by the ethmoid bone?
The ethmoid bone is a single, midline bone that forms the roof and lateral walls of the upper nasal cavity, the upper portion of the nasal septum, and contributes to the medial wall of the orbit (Figure 6.23). On the interior of the skull, the ethmoid also forms a portion of the floor of the anterior cranial cavity.
How many bones does the temporal bone articulate with?
The temporal bones are divided into the squamosal, mastoid, tympanic, styloid, and petrous segments. Each articulates with the zygomatic bone (zygomaticotemporal suture), sphenoid bone (sphenosquamosal suture), parietal bone (parietosquamous suture), and occipital bone (occipitomastoid suture).
Where does the skull rest on the vertebral column?
Its most obvious feature is the foramen magnum, which admits the spinal cord to the cranial cavity and provides a point of attachment for the dura mater. A smooth knob on either side of the foramen magnum, where the skull rests on the vertebral column.
What is the large projection of the temporal bone called quizlet?
The bony projection that is lateral and posterior is the styloid process. On the inferior aspect of the petrous part of the temporal bone and posterior to the external acoustic meatus is a large roughened projection, the mastoid process. 55.
What are the key landmarks of the temporal bone?
The surface landmarks on the squamous portion: 1, temporal fossa; 2, supra-meatal crest; 3, temporal line; 4, external acoustic meatus; 5, supra-meatal triangle (Macewen’s triangle); 6, middle temporal artery; 7, squamo-mastoid suture; 8, mandibular fossa (glenoid fossa); 9, articular eminence; 10, zygomatic process; …
Is the temporal axial or appendicular?
The temporal bone is part of the axial skeleton. There are two temporal bones in the body, one found on each side of the head.
What forms the inferior temporal line?
n. The lower of two curved lines on the parietal bone, marking the limit of attachment of the temporal muscle.
Where is the parietal bone located in the skull?
parietal bone, cranial bone forming part of the side and top of the head. In front each parietal bone adjoins the frontal bone; in back, the occipital bone; and below, the temporal and sphenoid bones. The parietal bones are marked internally by meningeal blood vessels and externally by the temporal muscles.
Where is mandibular fossa?
Each mandibular fossa or glenoid fossa forms the temporal component of the TMJ. It is a concave area on the inferior border of the squamous part of the temporal bone that is also referred to as the articular fossa.
What is the weakest part of the skull?
Clinical significance The pterion is known as the weakest part of the skull. The anterior division of the middle meningeal artery runs underneath the pterion. Consequently, a traumatic blow to the pterion may rupture the middle meningeal artery causing an epidural haematoma.
Where is the sagittal suture?
Sagittal suture. This extends from the front of the head to the back, down the middle of the top of the head. The 2 parietal bone plates meet at the sagittal suture.
Where is the sagittal crest?
A sagittal crest is a ridge of bone running lengthwise along the midline of the top of the skull of many mammalian and reptilian skulls, among others. The presence of this ridge of bone indicates that there are exceptionally strong jaw muscles.
