Muscles

Buccinator Origin:

Alveolar processes of the maxilla and the mandible, and the pterygomandibular raphe

Styloglossus Origin:

Anterior surface of the styloid process of the temporal bone

Diagastric Function:

Assist in opening of the mouth

Orbicularis Oris Function:

Closing the lips and protruding/ puckering them

Mylohyoid Origin:

Composed of right and left halves that join in the midline of the mandible

Buccinator Function:

Compresses the cheeks against the teeth to assist during mastication. Assists in blowing air out of the mouth.

Zygomatic Major Insertion:

Corners of the mouth

No

Does the hyoid bone articulate with any other bone?

Stylohyoid Function:

Draws the hyoid bone superiorly (up) and posteriorly (back) and keeps it stable

Mentalis Origin:

Incisive fossa of the mandible

Orbicularis Oris Insertion:

Into itself and the surrounding skin around the lips

Geniohyoid Insertion:

Into the anterior portion (front) of the hyoid bone

Mylohyoid Insertion:

Into the body of the hyoid bone

Stylohyoid Insertion:

Into the body of the hyoid bone

Buccinator Insertion:

Into the corners of the mouth, becoming part of the muscles that surround the mouth

Temporalis Insertion :

Into the coronoid process of the mandible and down the anterior border of the ramus.

Internal (Medial) Pterygoid Insertion:

Into the interior surface of the angle of the mandible (opposite of the masseter's insertion).

Diagastric Insertion:

Into the intermediate tendon of the hyoid bone

External (Lateral) Pterygoid Insertion:

Superior: Into the articular capsule of the temporomandibular joint. Inferior: Into the neck of the condyle of the mandible.

Geniohyoid Origin:

The genial tubercle of the mandible

Genioglossus Insertion:

Fans out to insert in the inferior surface of the tongue and to the hyoid bone

Orbicularis Oris Origin:

No skeletal attachment. From the muscle fibers that surround the mouth, maxilla and mandible

Styloglossus Function:

Retracts the tongue and raises the tip of the tongue

Internal (Medial) Pterygoid Muscle

What muscle is this?

Masseter Muscle

What muscle is this?

Mentalis Muscle

What muscle is this?

Orbicularis Oris Muscle

What muscle is this?

Styloglossus Muscle

What muscle is this?

Stylohyoid Muscle

What muscle is this?

Temporalis Muscle

What muscle is this?

Zygomatic Major Muscle

What muscle is this?

Temporalis Function:

Elevates the mandible- closing the jaw. Contraction of the posterior fibers retracts the mandible.

Internal (Medial) Pterygoid Function:

Elevates the mandible.

Temporalis Muscle Origin :

Fan shape across the temporal fossa of the temporal bone.

Mylohyoid Function:

Forms the floor of the mouth and helps in depressing the mandible and lifting the tongue

Genioglossus Origin:

Genial tubercle in the center of the lingual of the mandible

Hyoglossus Origin:

Hyoid bone

Zygomatic Major Function:

Lifts the corners of the mouth upward and backward, as in smiling.

Hyoglossus Function:

Mainly depresses the tongue

Internal (Medial) Pterygoid Origin:

Medial surface of the lateral pterygoid plate of the sphenoid bone, the lateral portion of the palatine bone and the maxillary tuberosity.

Genioglossus Function:

Most of the work of the tongue. Protrudes the tongue and retracts or depresses the tongue

External (Lateral) Pterygoid Function:

Opens the jaw by depressing the mandible. If both laterals contract the jaw protrudes; if only one contracts the mandible shifts laterally.

Styloglossus Insertion:

Part inserts into the sides of the tongue while the rest of the muscle continues forward to the tip of the tongue

Hyoid Bone Location:

Positioned in the neck, suspended between the mandible and the larynx. Suspended from the styloid process of the temporal bone by two styloid ligaments.

Diagastric Origin:

Posterior belly: originates from the mastoid process of the temporal bone. Anterior belly: lingual surface of the mandible.

Hyoid Bone Function:

Primary support for the tongue and other muscles

Geniohyoid Function:

Pulls the hyoid bone and tongue anteriorly (forward)

Hyoglossus Insertion:

Runs vertically to insert into the inferior sides of the tongue

Hyoid Bone Anatomy:

Shaped like a horseshoe and consists of central body with two lateral projections.

Mentalis Insertion:

Skin of the chin

Masseter Function:

Strong elevator of the jaw. Muscle is easily seen when the teeth are clenched.

Masseter Insertion:

Superficial portion: Into the angle and lower border of the mandible. Deep: Into the upper section of the ramus and the lateral surface of the coronoid process.

External (Lateral) Pterygoid Origin:

Superior: From the lateral surface of the greater wing of the sphenoid bone. Inferior: From the lateral surface of the lateral pterygoid plate.

Stylohyoid Origin:

The styloid process of the temporal bone

Masseter Origin:

Two portions: Superficial Portion: (strong, tendinous fibers from the zygomatic process of the maxilla and from the anterior two-thirds of the lower border of the zygomatic arch) Deep: (Muscular and smaller from the medial aspect and inferior border of the posterior one-third of the zygomatic arch)

Hyoid Bone

What bone is this?

Body of the hyoid bone

What is the arrow pointing to?

Greater cornu of the hyoid bone

What is the arrow pointing to?

Lesser Cornu of the hyoid bone

What is the arrow pointing to?

External (Lateral) Pterygoid Muscle

What is the green shaded muscle referring to?

Mylohyoid Muscle

What muscle is this ?

Buccinator Muscle

What muscle is this?

Diagastric Muscle

What muscle is this?

Genioglossus Muscle

What muscle is this?

Geniohyoid Muscle

What muscle is this?

Hyoglossus Muscle

What muscle is this?

Genioglossus

Which of the extrinsic muscles of the tongue lie across the floor of the mouth?

Mentalis Function:

Wrinkles the skin of the chin and protrudes the lower lip

Zygomatic Major Origin:

Zygomatic bone