Anatomy Exam Bones of the Cranial Vault 4

Question 1

Craniosynostosis of the sagittal suture most commonly produces which skull shape?

Accepted Answer

Scaphocephaly (long, narrow skull)

Answer

Premature fusion of the sagittal suture restricts lateral growth, forcing the skull to elongate anteroposteriorly, producing scaphocephaly.

Question 2

Which groove on the inner surface of the occipital bone lodges the transverse sinus?

Accepted Answer

Transverse sulcus

Answer

The transverse sulcus is the horizontal groove on the inner surface of the occipital bone that houses the transverse venous sinus.

Question 3

The frontal bone develops from how many primary ossification centers?

Accepted Answer

Two

Answer

The frontal bone develops from two ossification centers, one for each half, which normally fuse by age 6–8; failure to fuse leaves a metopic suture.

Question 4

Which part of the sphenoid bone contributes to the cranial vault's roof?

Accepted Answer

Greater wings

Answer

The greater wings of the sphenoid bone form part of the lateral walls and floor of the cranial vault, contributing to the temporal fossa.

Question 5

Wormian (sutural) bones are most commonly found near which suture?

Accepted Answer

Lambdoid suture

Answer

Wormian bones are small, irregular accessory ossicles most frequently found within the lambdoid suture, though they can occur in any suture.

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