Ch. 11 Cranium

Question 1

The skull is composed of ____ separate bones.

Answer 1

22

Question 2

There are ___ cranial bones.

Answer 2

8

Question 3

The normal cranium is usually ___ shaped.

Answer 3

Oval!

Question 4

What bones form a large portion of the sides of the cranium?

Answer 4

The Parietal Bones

Question 5

The occipital bone houses the ___, through which the inferior portion of the medulla oblongata passes to join the spinal cord.

Answer 5

Foramen Magnum

Question 6

The squamous portion of the ___ bone has a prominent arched process with articulates with the zygomatic bone and completes the zygomatic arch.

Answer 6

Temporal Bone

Question 7

The ___ is the thickest, densest bone in the cranium and contains organs for hearing and balance.

Answer 7

Petrous Portion

Question 8

The upper portion of the petrous portion is commonly referred to as the _____

Answer 8

Petrous Ridge

Question 9

The upper portion of the petrous portion is commonly referred to as the _____

Answer 9

Petrous Ridge

Question 10

TEA is a radiographic landmark that stands for _____

Answer 10

Top of Ear Attachment

Question 11

What are the smallest bones in the skull?

Answer 11

Lacrimal Bones

Question 12

The midpoint of the anterior nasal spine is called the ____

Answer 12

Acanthion

Question 13

There is an average ____ degree difference between the OML and IOML.

Answer 13

7 degree

Question 14

The brachycephalic skull is ___ from front to back and ____ from side to side.

Answer 14

• Short
• Broad

Question 15

The dolichocephalic skull is ___ from front to back and ___ from side to side.

Answer 15

• Long
• Narrow

Question 16

The skull is divided into ___ distinct groups.

___ Cranial Bones
___ Facial Bones

Answer 16

-2
-8 cranial
-14 facial

Question 17

The cranial bones form a protective housing for the ___

Answer 17

Brain

Question 18

Name the 4 Calvaria (top) Cranial Bones:

(TEST)

Answer 18

• Frontal
• Occipital
• Right Parietal
• Left Parietal

Question 19

Name the 4 floor cranial bones:

Answer 19

• Ethmoid
• Sphenoid
• Right Temporal
• Left Temporal

Question 20

The bones of the cranial vault are composed of two plates of compact tissue separated by an inner layer of spongy tissue called ____

Answer 20

Diploë

Question 21

Which plate or table (inner or outer) is the thickest?

Answer 21

Outer

Question 22

Except for the ___, the bones of the cranium and face are joined by fibrous joints called ____

Answer 22

• Mandible
• Sutures

Question 23

Name the four sutures:

Answer 23

• Coronal
• Sagittal
• Squamosal
• Lambdoidal

Question 24

The ___ suture is found between the frontal and parietal bones.

Answer 24

Coronal

Question 25

The ___ suture is located on the top of the head between the two parietal bones and just behind the coronal suture line.

Answer 25

Sagittal

Question 26

What is the junction of the coronal and Sagittal sutures?

Answer 26

The bregma

Question 27

Between the temporal bones and the parietal bones are the _____ sutures

Answer 27

Squamosal

Question 28

Where is the lambdoidal suture?

Answer 28

Between the occipital bone and the parietal bones

Question 29

The ___ is the junction of the lambdoidal and sagittal sutures.

Answer 29

Lambda

Question 30

The cranium developed rapidly in size and density during the first 5 or 6 years, after which a gradual increase occurs until adult size and density are achieved, usually by what age?

Answer 30

12 years

Question 31

The atrophy of old age is less marked in what region of the body?

Answer 31

Crania

Question 32

The ____ bone is a small, cube-shaped bone that consisted of a horizontal plate; a vertical plate, and two light, spaced not lateral masses called _____

Answer 32

Ethmoid Labyrinths

Question 33

Situated between the orbits, the ethmoid bone forms part of the ___, ____, ____ , and _____

Answer 33

- Anterior Cranial Fossa - Nasal Cabity - Orbital Walls - Bony Nasal Septum

Question 34

The horizontal portion of the ethmoid bone is called the ____, which is received into the ethmoid notch of the frontal bone.

Answer 34

Cribriform Plate

Question 35

The vertical portion of the ethmoid bone is called the ____

Answer 35

Perpendicular Plate

Question 36

What contains the ethmoid sinuses, or air cells?

Answer 36

The labyrinths

Question 37

The ethmoid bone articulates with the ___ and ____ bones of the cranium.

Answer 37

Frontal Sphenoid

Question 38

What bones form a large portion of the sides of the cranium?

Answer 38

Parietal Bones

Question 39

Each parietal bone presents a prominent bulge, called the ____

Answer 39

Parietal Eminence.

Question 40

Where should you measure the width of the head?

Answer 40

At the prominent bulge, called the parietal eminence near the central portion of its external surface

Question 41

Each parietal bone articulates with what bones?

Answer 41

Frontal Temporal Occipital Sphenoid and the opposite parietal bone

Question 42

The ___ bone is an irregularly wedge-shaped bone that resembles a bat with wings extended.

Answer 42

Sphenoid

Question 43

Where is the sphenoid bone situated?

Answer 43

In the base of the cranium anterior to the temporal bones and basilar part of the occipital bone

Question 44

What does the sphenoid bone consist of?

Answer 44

- A body - Two Lesser wings & Two Greater wings (project laterally from the sides of the body) - Two pterygoid processes (project inferiority from each side of the inferior surface of the body)