Podcast
Questions and Answers
The temporal fossa is superiorly bounded by the zygomatic arch and inferiorly by the temporal lines.
The temporal fossa is superiorly bounded by the zygomatic arch and inferiorly by the temporal lines.
False (B)
The pterion, a significant landmark, is a component of the temporal fossa's lateral wall.
The pterion, a significant landmark, is a component of the temporal fossa's lateral wall.
False (B)
The zygomatic arch is exclusively formed by the zygomatic process of the temporal bone and the temporal process of the zygomatic bone.
The zygomatic arch is exclusively formed by the zygomatic process of the temporal bone and the temporal process of the zygomatic bone.
False (B)
The auriculotemporal nerve crosses the zygomatic arch well forward, immediately adjacent to the nasal region.
The auriculotemporal nerve crosses the zygomatic arch well forward, immediately adjacent to the nasal region.
The temporalis fascia attaches to the inferior temporal line and extends inferiorly to the lower border of the zygomatic arch.
The temporalis fascia attaches to the inferior temporal line and extends inferiorly to the lower border of the zygomatic arch.
The middle temporal artery and vein pass superficial to the temporalis fascia.
The middle temporal artery and vein pass superficial to the temporalis fascia.
The temporalis muscle originates from the temporal fossa, spanning the area between the superior temporal line and the supramastoid crest.
The temporalis muscle originates from the temporal fossa, spanning the area between the superior temporal line and the supramastoid crest.
In newborns, the temporalis muscle is notably large, extending high up the side of the skull from birth.
In newborns, the temporalis muscle is notably large, extending high up the side of the skull from birth.
The posterior fibers of the temporalis muscle are oriented vertically, running straight downwards to their insertion point.
The posterior fibers of the temporalis muscle are oriented vertically, running straight downwards to their insertion point.
The temporalis muscle inserts exclusively on the lateral surface of the coronoid process of the mandible.
The temporalis muscle inserts exclusively on the lateral surface of the coronoid process of the mandible.
The tendon of the temporalis muscle primarily inserts into the outer plate of the mandible beyond the coronoid process border.
The tendon of the temporalis muscle primarily inserts into the outer plate of the mandible beyond the coronoid process border.
The temporalis muscle receives its blood supply exclusively from the temporal branches of the facial artery.
The temporalis muscle receives its blood supply exclusively from the temporal branches of the facial artery.
The temporalis muscle is innervated by three deep temporal branches of the mandibular nerve.
The temporalis muscle is innervated by three deep temporal branches of the mandibular nerve.
All fibers of the temporalis muscle contribute to the retraction of the mandible.
All fibers of the temporalis muscle contribute to the retraction of the mandible.
The middle temporal artery solely supplies the temporalis muscle
The middle temporal artery solely supplies the temporalis muscle
The superior and anterior fibers of the temporalis muscle depress the mandible
The superior and anterior fibers of the temporalis muscle depress the mandible
Besides retracting the mandible, the posterior fibers of the temporalis muscle also contribute to the lateral movement of the mandible
Besides retracting the mandible, the posterior fibers of the temporalis muscle also contribute to the lateral movement of the mandible
The mental nerve provides the primary innervation for the temporalis muscle.
The mental nerve provides the primary innervation for the temporalis muscle.
The buccinator muscle attaches to the coronoid process
The buccinator muscle attaches to the coronoid process
The facial nerve reinforces the nerve supply to the temporalis muscle.
The facial nerve reinforces the nerve supply to the temporalis muscle.
Flashcards
Temporal Fossa
Temporal Fossa
Area bounded by the temporal lines above and the zygomatic arch below.
Zygomatic Arch
Zygomatic Arch
Formed by processes of the temporal and zygomatic bones, completed anteriorly by the zygomatic process of the maxilla.
Temporal Lines
Temporal Lines
Superior and inferior, diverging from a common origin at the zygomatic process of the frontal bone.
Temporalis Fascia
Temporalis Fascia
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Nerves crossing the Zygomatic Arch
Nerves crossing the Zygomatic Arch
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Temporalis Muscle
Temporalis Muscle
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Deep to the Zygomatic Arch
Deep to the Zygomatic Arch
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Pterion
Pterion
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Temporalis Muscle Fibers
Temporalis Muscle Fibers
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Structures on Temporalis Fascia
Structures on Temporalis Fascia
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Temporalis Insertion
Temporalis Insertion
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Temporalis Blood Supply
Temporalis Blood Supply
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Temporalis Nerve Supply
Temporalis Nerve Supply
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Anterior Temporalis Action
Anterior Temporalis Action
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Posterior Temporalis Action
Posterior Temporalis Action
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Muscle that retracts the condyle
Muscle that retracts the condyle
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Temporalis Insertion Point
Temporalis Insertion Point
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Temporalis Action
Temporalis Action
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Which fibers retract the condyle?
Which fibers retract the condyle?
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Temporalis Location & Insertion
Temporalis Location & Insertion
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Study Notes
- On a skull, superior and inferior temporal lines diverge from the zygomatic process of the frontal bone, arching back behind the ear.
- Polished bone lies between the temporal lines.
Temporal Fossa
- Defined as the region above the zygomatic arch and below the temporal lines
- Roof = temporalis fascia
- Floor = part of the side of the skull including the pterion
- Anterior wall = zygomatic bone and zygomatic processes of the frontal bone and maxilla
- Supramastoid crest continues the line of the upper margin of the arch backwards.
- Contains the temporalis muscle, which originates from the floor and overlying fascia
- Superiorly, it connects with the infratemporal fossa at the infratemporal crest of the sphenoid's greater wing.
Zygomatic Arch
- Formed via processes of the squamous temporal and zygomatic bones meeting at a suture that slopes downwards and backwards
- Completed anteriorly by the zygomatic process of the maxilla
Nerves Crossing the Arch
- Vulnerable to injury during incisions or fractures
- Includes the auriculotemporal nerve (positioned well back, just in front of the ear)
- Includes temporal and zygomatic branches of the facial nerve, which extend to the frontalis and eyelid muscles.
Temporalis Fascia
- Attaches to the superior temporal line and extends down to the upper border of the zygomatic arch
- Described as a rugged membrane
- Superficial temporal vessels and auriculotemporal nerve lie upon it
- Perforated by the middle temporal artery and vein
Temporalis Muscle
- Originates from the temporal fossa, spanning the area between the inferior temporal line and the infratemporal crest
- Small in newborns, it ascends the side of the skull as the individual grows
- Anterior fibers are vertical, while posterior fibers are horizontal, curving downwards over the root of the zygomatic arch
- Fan-shaped, converging towards the coronoid process of the mandible, transitioning into tendon
- Insertion begins at the deepest part of the mandibular notch
- Climbs over the coronoid process onto the front of the ramus
- Inserts mainly into the bevelled surface on the inner plate of the bone, at the posterior border of the coronoid process
- Continues down the ascending ramus as far as the attachment of the buccinator in the retromolar fossa
- Blood supply comes from the temporal branches of the maxillary artery, enhanced by the middle temporal artery
- Nerve supply provided by two deep temporal branches of the mandibular nerve and sometimes the middle temporal nerve
- Upper and anterior fibers elevate the mandible (close the jaws)
- Posterior fibers retract the mandible; these are the only fibers to do so in the head.
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Description
An overview of temporal fossa and zygomatic arch anatomy. This includes the boundaries, walls, and contents of the temporal fossa, as well as the formation and components of the zygomatic arch. Also mentions the nerves in the area.
