OriginTemporal fossa (up to inferior temporal line), Temporal fasciaInsertionApex and medial surface of coronoid process of mandibleActionAnterior fibres: Elevates mandible Posterior part: Retracts mandibleInnervationDeep temporal branches (of mandibular nerve (CN V3))
Where are the temporal lines?
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.
Where 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 bones are on the temporal line?
Temporal boneStructure of temporal bone (left)DetailsArticulationsOccipital, parietal, sphenoid, mandible and zygomaticIdentifiersWhat 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 temporalis muscle?
The temporalis muscle attaches above to the bone and fascia in the temporal fossa, superior to the zygomatic arch, and below to the coronoid process of the mandible and along the mandibular ramus (Figure 6-17). The temporalis muscles primarily close the jaw while the middle fibers bilaterally retrude the mandible.
What is attached to superior temporal line?
superior temporal line. The upper of two curved lines on the parietal bone; the temporal fascia is attached to it.
What is the Forum Magnum?
The foramen magnum (Latin: great hole) is a large, oval-shaped opening in the occipital bone of the skull. It is one of the several oval or circular openings (foramina) in the base of the skull. … It also transmits the accessory nerve into the skull. The foramen magnum is a very important feature in bipedal mammals.Where is sphenoid?
The sphenoid is an unpaired bone. It sits anteriorly in the cranium, and contributes to the middle cranial fossa, the lateral wall of the skull, and the floor and sides of both orbits. It has articulations with twelve other bones: Unpaired bones – Occipital, vomer, ethmoid and frontal bones.
Is temporal bone a facial bone?The bones that make up the neurocranium are the singular occipital, frontal, sphenoid, and ethmoid bones, and the paired temporal and parietal bones. The neurocranium is, therefore, composed of eight bones. As we have already seen, the facial bones sometimes include the sphenoid and ethmoid bones, and sometimes not.
Article first time published onIs temporal bone a flat bone?
No, the temporal bone is not a flat bone. Instead, it is usually classified as an irregular bone due to its unusual shape.
Does everyone have Sutural bones?
They are found in both sexes as well as in both sides of the skull. Approximately half of Sutural bones are located in the lambdoid suture and fontanel and the masto-occipital suture. The second most common site of incidence (about 25%) is in the coronal suture. The rest occur in any remaining sutures and fontanels.
What is occipital bone?
The occipital bone is the most posterior cranial bone and the main bone of the occiput. It is considered a flat bone, like all other cranial bones, meaning that its primary function is either for protection or to provide a broad surface for muscle attachment. The scalp, which consists of five layers, covers the bone.
What are facial bones?
The primary bones of the face are the mandible, maxilla, frontal bone, nasal bones, and zygoma. Facial bone anatomy is complex, yet elegant, in its suitability to serve a multitude of functions.
What is the inferior temporal line?
[TA] the lower of two curved lines on the parietal bone; it marks the outer limit of attachment of the temporalis muscle. SYN: linea temporalis inferior ossis parietalis [TA], temporal ridge.
Do skulls have ear holes?
Yes, all mammals and probably all animals have a hole in the skull where the ears are. The ears are on the outside of the skull and the eardrum is still outside the majority of the skull. Since that is where the sound is detected, there has to be a hole for nerves going from the eardrum area to the brain.
What lies deep Pterion?
The pterion is known as ‘the danger area’ on the skull for head injuries. This is because the bone is thin at this site and is grooved by vessels on its internal surface (or may even lie in a bony tunnel here). It is the anterior branch of the middle meningeal artery (and vein) that lies deep to the pterion.
What is a Inion?
Definition of inion : the external occipital protuberance of the skull.
Where does temporalis attach?
The temporalis muscle is the major adductor (closer) of the reptilian jaw. In mammals the temporalis is divided into a deep temporalis proper and a more superficial masseter muscle. The temporalis attaches to the coronoid process of the mandible (lower jaw) and the temporal bone of…
What attaches to the temporal lines?
Temporal lines on the lateral ectocranial surface mark the attachment of the temporalis muscle, a major elevator of the mandible, and its covering, the temporal fascia, a fascial sheet that covers the temporalis.
What covers the temporalis muscle?
The temporal fascia covers the temporalis muscle. It is a strong, fibrous investment, covered, laterally, by the auricularis anterior and superior, by the galea aponeurotica, and by part of the orbicularis oculi. … It affords attachment by its deep surface to the superficial fibers of the temporalis.
Which are actions of the temporalis?
The temporalis muscle is a fan-shaped muscle located at each side of the head/skull near the area of the temples. This muscle’s action is to move the mandible up, back, and side-to-side. These movements allow the temporalis muscle to play an important role in biting and chewing food.
How did the temporalis get its name?
The temporalis muscle is a muscle that gets its name based on its location in the body. … The temporalis muscle originates from the temporal fossa (the depressed area of the temporal bone) and the temporal fascia (the tendinous connective tissue that lies beneath the skin on top of the temporal bone).
Where does Brachioradialis attach?
OriginLateral supracondylar ridge of humerus, lateral intermuscular septum of armInsertion(Proximal to) styloid process of radiusActionElbow joint: Forearm flexion (when semi pronated)InnervationRadial nerve (C5-C6)Blood supplyRadial artery, radial recurrent arteries, radial collateral artery
Where is optic foramen?
The optic foramen, the opening through which the optic nerve runs back into the brain and the large ophthalmic artery enters the orbit, is at the nasal side of the apex; the superior orbital fissure is a larger hole through which pass large veins and nerves.…
Where is the paranasal sinus?
The paranasal sinuses are air-filled spaces located within the bones of the skull and facial bones.
Where is maxillary?
The maxilla is the bone that forms your upper jaw. The right and left halves of the maxilla are irregularly shaped bones that fuse together in the middle of the skull, below the nose, in an area known as the intermaxillary suture.
What is the hypoglossal canal?
The hypoglossal canal is located between the occipital condyle and jugular tubercle and runs obliquely forwards (posteromedial to anterolateral) allowing the hypoglossal nerve to exit the posterior cranial fossa.
What is the only movable joint found in the skull?
The only bone in your skull that forms freely movable joints is your mandible, or jawbone.
What is this foramen name?
Cranial fossaposterior cranial fossaForaminajugular foramenNumber2Vesselsinternal jugular vein, inferior petrosal sinus, sigmoid sinusNervesglossopharyngeal nerve (IX), vagus nerve (X), accessory nerve (XI)
What are the 7 facial bones?
Facial Bones. The viscerocranium (face) includes these bones: vomer, 2 inferior nasal conchae, 2 nasals, maxilla, mandible, palatine, 2 zygomatics, and 2 lacrimals.
