Sutures

When is ossification of the posterior and sphenoidal fontanels are completed?

1st and 3rd month

The sagittal suture separates:

The 2 parietal bones and is located mid-line on top of the head

How many squamousal sutures are there?

2

How many fontanels do infants have?

6 1(Anterior) 1(Posterior) 2(Spenoid) 2(Fontanels)

Where is the Bregma junction located?

Anterior end of the sagittal suture that intersects with the coronal suture

Where are the Asterion junctions located?

Behind the ear at the junction of the occipital, parietal bones and the mastoid.

The Lambdoidal suture separates:

Both parietal bones from the occipital bones

What are the suture junctions?

Bregma, Lambda, Pterions and Asterions

What are the sutures found in adults?

Coronal, Sagittal, Squamousal and Lambdoidal

When is ossification of the anterior and mastoid fontanels are completed?

End of 2nd year

The squamousal suture:

Is formed by the junction of the parietal bones and temporal bones

What is a fontanel?

Membrane covered openings or soft spots of incomplete ossification found in infants

Where is the Lambda junction located?

Posterior end of the sagittal suture that intersects with the lambdoidal suture

Where are the Pterions (2) located?

R and L located on the lateral aspect of the skull where the parietal bone, squamosal suture and greater wing of the sphenoid meet.

Bones of the cranium and face are joined by fibrous joints called:

Sutures

Sutures are classified as:

Synarthrodial joints (immovable)

The coronal suture separates:

The frontal bone from the two parietal bones