Human Skull Structure

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Questions and Answers

Which of the following bones has a parietal foramen?

Occipital bone

Frontal bone

Sphenoid bone

Parietal bone (correct)

How many angles does the parietal bone have?

4 (correct)

Which point is located at the asterion?

Mastoid angle (correct)

Lambda

Pterion

Where is the frontal angle located?

At bregma Signup and view all the answers

Which point is NOT one of the four angles of the parietal bone?

Nasion Signup and view all the answers

What is the total number of bones in the skull?

22 Signup and view all the answers

What is the function of the cranium?

Protecting the brain and meninges Signup and view all the answers

How many bones form the face?

14 Signup and view all the answers

What is the difference between the number of bones in the cranium and the face?

6 Signup and view all the answers

What is the proportion of bones in the cranium to the total number of bones in the skull?

2/5 Signup and view all the answers

Which bones does the basilar portion articulate with?

Petrous part of the temporal and the sphenoid bones Signup and view all the answers

What is the location of the basilar portion relative to the foramen magnum?

Immediately anterior to the foramen magnum Signup and view all the answers

What is the function of the basilar portion?

It forms a joint with other bones Signup and view all the answers

What type of joint is formed by the basilar portion?

Fibrous joints Signup and view all the answers

What is the role of the bones that the basilar portion articulates with?

They provide protection for the brain Signup and view all the answers

What is the shape of the parietal bones that form the roof and sides of the cranial vault?

Relatively square Signup and view all the answers

What structure is found on the endocranial surface of the parietal bones?

Grooves made by branches of the middle meningeal artery Signup and view all the answers

What is the function of the grooves found on the endocranial surface of the parietal bones?

To accommodate blood vessels that supply the brain Signup and view all the answers

How many parietal bones are found in the cranial vault?

Two Signup and view all the answers

What is the name of the artery that makes grooves on the endocranial surface of the parietal bones?

Middle meningeal artery Signup and view all the answers

What is located on the posterior inferior surface of the petrous part?

Jugular fossa Signup and view all the answers

What feature does the mastoid part of the petrous bone have?

Large mastoid air cells Signup and view all the answers

What is true about the mastoid part of the petrous bone?

It extends posteriorly and has large mastoid air cells Signup and view all the answers

What is NOT a feature of the mastoid part of the petrous bone?

Parietal foramen Signup and view all the answers

What is the location of the jugular fossa?

Posterior inferior surface of the petrous part Signup and view all the answers

Study Notes

Skull Composition

The skull is composed of 22 bones.
8 bones form the cranium, which contains the brain and meninges.
14 bones form the face.

Parietal Bones

There are 2 parietal bones that form the roof and sides of the cranial vault.
These bones are relatively square in shape.
The endocranial surface has grooves made by branches of the middle meningeal artery.
The parietal foramen is a feature of these bones.

Angles of the Parietal Bones

There are 4 angles:
- Frontal angle: located at bregma.
- Sphenoid angle: located at pterion.
- Occipital angle: located at lambda.
- Mastoid angle: located at asterion.

Basilar Portion

Articulates with the petrous part of the temporal and the sphenoid bones.
Located immediately anterior to the foramen magnum.
The posterior inferior surface of the petrous part has the jugular fossa.

Mastoid Part

Extends posteriorly.
Has large mastoid air cells.

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Description

This quiz covers the composition of the human skull, including the number of bones and their functions. Learn about the cranium and facial bones that make up the skull.