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Quiz 4 Masseter, Temporalis & Bones
For Quiz 4 lecture presented on 8/29
14
Science
Undergraduate 1
08/29/2011

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Term
Name the 8 Cranial Bones
Definition
Frontal, Parietal (2), Temperal (2), Occiput, Ethmoid, Splenoid TG: p228
Term
The Temporal Fossa is known as "The Four Corners." It is the intersection of the following 4 Cranial bones:
Definition
Frontal, Parietal, Sphenoid & Temporal
TG p 229
Term
What muscle origininates on the Temporal Fossa?
Definition
Temporalis
TG p 251
Term
Although there are 14 Facial Bones, what are the 3 we are focusing on?
Definition
Maxilla, Mandible and Zygomatic
TG p229
Term
What are the three important landmarks on the Mandible?
Definition
Ange, Ramus and Angle
TG p 230
Term
What Exocrine Gland is in the area where the Mandible and Maxilla articulate?
Definition
Parotid Gland
TG p 270
Term
Temporalis Muscle
Origin:
Insertion:
Action:
Definition
Origin: Temporal Fossa (intersection of 4 Cranial Bones: Temporal, Parietal, Frontal and Sphenoid.)
Insertion: Coronoid process of the Mandible (Crown Line.)
Action: Elevation and Retraction of Mandible
TG p 251
Term
Description of the Coronoid Process of the Mandible
Definition
When you place your fingers on the TM, temporomandibular joint, and OPEN your mouth, the CORONOID "pops" out.
It is the insertion of the Temporalis Muscle.
TG p 235
Term
What landmark on the Zygomatic Bone is of importance at this poont?
Definition
Zygomatic arch.
It is the origin of the Masseter muscle.
TG p 230
Term
What does the word, "Masseter" mean?
Definition
"To chew." This is how the muscle is named.
Term
Masseter Muscle
Origin:
Insertion:
Action:
Definition
Origin: Zygomatic arch
Insertion: Angle and Ramus of the Mandible
Action: Elevation of the mandible (closing the open mouth.)
TG p 250
Term
what does the word 'ramus' mean?
Definition
Branch
Term
Fact: When both attachments of a muscle are on the axial skeleton, the INFERIOR attachment is the origin. The origin is usually fixed and not moveable. The SUPERIOR attachment is insertion. The insertion is the movemable attachment. Most of the time, the insertion moves toward the origin.
Definition
EXCEPTION: The Temporalis and Masseter are exceptions. Both attachments are on the Axial skeleton. HOWEVER, on both muscles, the SUPERIOR attachments are the origins, the non-moveable parts. And, the INFERIOR attachments are the insertions, the movemable parts.
The insertion still moves toward the origin.
Term
What is a unique characteristic of the Temporalis?
Definition
It travels underneath the arch of the zygomatic bone on its way to attach onto the coronoid process of the mandible.
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