Chapter 11: Muscles

What is the insertion of the temporalis muscle?

Coronoid process of the mandible

The activity of this muscle on each side of the head allows for precise occlusal (coming together of the mandible and maxilla) movements.

Digastric muscle

These are also known as the strap muscles of the neck:

Infrahyoid muscles

What type of fascicle arrangement is the medial pterygoid and what is its orientation?

It is a multipennate and obliquely oriented muscle.

Of the muscles of mastication what muscles are depressors?

Lateral pterygoid (NOTE: LATERAL PTERYGOID ALSO is an elevator)

What are the muscles of mastication?

Temporalis Masseter Medial pterygoid Lateral Pterygoid

Of the muscles of mastication what muscles are elevators?

Temporalis, Masseter, medial and lateral pterygoid (so basically all of them )

What is the insertion of the Digastric muscle?

digastric fossa on the lower lingual aspect of the mandible.

What is the origin of the Digastric muscle?

digastric fossa( which is medial to the mastoid process)

Head #1 , since it originates at a position HIGHER than the mandibular fossa would act to ___ the jaw and to protrude the jaw (elevate or depress)

elevate

What is the insertion of the geniohyoid muscle?

hyoid bone

The following describes the actions of the ___ muscles which are also known as the strap muscles: -muscles do not act on the mandible -muscles act to stablize the hyoid bone to allow for the action of the digastric and mylohyoid muscles.

infrahyoid

The following muscles : geniohyoid, mylohyoid, and stylohyoid- oppose the actions of the ___ muscle?

infrahyoid

There are four heads of ____ muscles and they include: -sternothryoid -thryohyoid -sternohyoid -omohyoid

infrahyoid

The Masseter, one of the muscles of mastication has two parts which are called ?

deep and superficial muscles

Head #2, since it originates at a position LOWER than the mandibular fossa, would act to ____ the jaw and to protrude the jaw (elevate or depress)

depress

The following describes what anterior muscle of the neck? -forms the diaphragm of the floor of the mouth

mylohoid

The following describes which head of the infrahyoid bone: -runs from the sternum to the hyoid bone

sternohyoid

What is the function of the stylohoid bone?

-acts to reract the hyoid bone (hence the tongue)

What is the insertion of the superficial masseter muscle?

-angular region of the ramus of the mandible.

What is the insertion of both head #1 and #2?

-depression on the neck of the condyle of the mandible

What is the origin of head #1 of the lateral pterygoid muscle?

-greater wing of the sphenoid bone

What is the insertion of the stylohoid bone?

-hyoid bone

What is the origin of the superficial masseter muscel?

-inferior edge of the zygomatic arch (up to the zygomatic-temporal suture)

Part of the temporalis muscle, the central tendon originates at the....

-inferior temporal line

The Deep Masseter muscle, a muscle of mastication orginates....

-inner aspect of the zygomatic arch

What is the origin of head #2 of the lateral pterygoid muscle?

-lateral aspect of the later pterygoid plate

What does the digastric muscle pass through? and where is it located?

-ligament attached to the side of the hyoid bone

What is the origin of the medial pterygoid muscle?

-medial aspect of the lateral pterygoid plate

What is the origin of the geniohyoid muscle?

-medial aspect of the mandibular symphysis

What is the insertion of the lateral pterygoid muscle?

-medial aspect of the ramus of the mandible

Where does the mylohoid muscle originate from?

-mylohyoid line on the inner aspect of the mandibular body

The following describes which head of the infrahyoid bone: -runs from the upper border of the scapula to the hyoid bone

-omohyoid

What is the origin of the stylohoid muscle?

-styloid process

The Temporalis muscle originates on the...

-superior and inferior temporal lines

Part of the Temporalis muscle, the temporal fascia originates at the...

-superior temporal line

What do the fibers of the medial portion mingle with?

-the temporalis muscle.

What is the action of the mylohoid?

-to pull the mandible downward and backward with the hyoid bone fixed -to pull the hyoid bone upward and forward with mandible fixed

The Deep Masseter muscle, a muscle of mastication inserts onto...

-uppermost aspect of the lateral surface of the mandibular ramus.

The following describes which muscle of mastication? -Most superficial muscle of mastication and overlies the ascending ramus of the mandible

Masseter

What is the orientation of the masseter muscle?

Obliquely oriented, almost perpendicular to the occlusal plane of the molars.

The following describes which head of the infrahyoid bone: -runs from the sternum to the thyroid cartilage

Sternothyroid

What is the fascicle arrangement of the temporalis muscle?

bipennate (fascicles attach to both sides of the tendon.)

Whether or not the lateral pterygoid acts as an elevator or depressor is dependent on the ____ of the origins of the muscle heads.

location

The following describes which head of the infrahyoid bone: -runs from the thyroid cartilage to the hyoid bone

thyrohyoid