Bones & Muscles Of The Skull

Front 1

How many Cranial bones are there?

Back 1

8

Front 2

How many Facial bones are there?

Back 2

14, (however, some textbooks include the hyoid as a facial bone which make it 15).

Front 3

The cranial bone forms the forepart (front) of the cranial vault, the roof of the eye sockets, and a small portion of the nasal cavity.

Back 3

Frontal Bone

Front 4

This bone is located between the occipital and frontal bones and forms the largest portion of the top and sides of the cranium.

Back 4

Parietal Bone

Front 5

This bone forms a portion of the right and left sides of the skull (Cranium) below the parietal bones and the main point of origin for the temporal muscle.

Back 5

Temporal Bone

Front 6

This bone has two sets of wings and looks like a bat with it's wings extended. Located in the middle of the base of the skull and site of the attachment for the sphenomandibular ligament.

Back 6

Sphenoid Bone

Front 7

Paired bones which unite at the midline to give shape to the midline of the face and consist of a body and 4 processes.

Back 7

Maxilla

Front 8

This process forms a portion of the lateral wall of the nose.

Back 8

Nasal Process (Frontal)

Front 9

This process joins with the zygoma and the zygomatic process of the temporal bone to form the zygomatic arch (cheek bone).

Back 9

Zygomatic Process

Front 10

Surrounds roots of the maxillary teeth.

Back 10

Alvolar Process

Front 11

Forms the anterior 2/3 of the hard palate.

Back 11

Palatine Process

Front 12

This bone makes up the posterior 1/3 of the hard palate.

Back 12

Palatine Bone

Front 13

U-shaped bone located anterior to the spinal column between the mandible and the larnyx.

Back 13

Hyoid

Front 14

This, otherwise known as the lower jaw is the only movable bone of the skull.

Back 14

Mandible

Front 15

Curved, somewhat like a horseshoe.

Back 15

Body of the Mandible

Front 16

A vertical projection at the posterior of the body.

Back 16

Ramus of the Mandible

Front 17

Angle of the mandible is where the body and ramus meet.

Back 17

Angle of the Mandible.

Front 18

The body of the mandible which surrounds the root structure of individual teeth.

Back 18

Alveolar Process of the Mandible

Front 19

The anterior process at the end of each Ramus.

Back 19

Coronoid Process of the Mandible

Front 20

The posterior process at the end of each Ramus.

Back 20

Condyloid Process of the Mandible

Front 21

The "U" shape conavity between the Condyloid and the Coronoid process.

Back 21

Mandibular Notch of the Mandible

Front 22

Joints that are highly irregular, jigsaw puzzle-like lines called sutures. Movement does occur but is very limited.

Back 22

Synarthrosis or Immovable joints

Front 23

Joints that are freely movable, gliding, hinge

Back 23

Ginglymodiarthrodial or Gliding Joint

Front 24

This type of joint existing between the occipital bone of the skull and the first vertebrae of the spinal column. There are two axes of motion. Allows you to nod your head and rotate it from side to side.

Back 24

Ellipsodial Joint

Front 25

An area where a muscle attaches and moves the least when it contracts.

Back 25

Origin

Front 26

An area where a muscle attaches that has the greatest movement during contrction.

Back 26

Insertion

Front 27

The perfmance expected when a particular muscle contracts.

Back 27

Action

Front 28

This is the most powerful muscle of mastication. Origin- Zygomatic arc, Insertion- lateral surface of the ramus, Action- Closing of the mandible with a hinge type closure.

Back 28

Masseter

Front 29

Origin- Side of the skull (Broad, fan shaped), Insertion point- Coronoid process of the mandible, Action- Help retrude the jaw and close the manible.

Back 29

Temporal (Temporalis)

Front 30

Origin- Palatine bone and the pterygoid process of the sphenoid bone. Insertion Point- The internal surface of the ramus of the mandible. Action- The medial pterygoid acts with the masseter and the temporal to close the mandible.

Back 30

Medial Pterygoid

Front 31

Origin- Pterygoid Process and the greater wing of the sphenoid bone. Insertion Point- is the neck of the condyloid process of the mandilbe. Action- Combination Side to Side and Protrusion.

Back 31

Lateral Pterygoid

Front 32

The right and left mylohyoid muscles join in the midline to form the floor of the mouth.

Back 32

Mylohyoid Depressor of the Mandble

Front 33

Located next to each side of the midline directly on top of the mylohyoid muscles.

Back 33

Geniohyoid Depressor of the Mandible.

Front 34

This muscle pulls the mandible downward and backward and runs under the mylohyoid muscles.

Back 34

Digastric Depressor of the Mandible

Front 35

Depressors of the Mandible

Back 35

Mylohyoid, Geniohyoid and Digastric.