Question
Point (arrow) shown in the skull depicts:
A. Inion
B. Stephanion
C. Pterion
D. Bregma
Show Answer
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Correct Answer » C Explanation |
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Ans:C. Pterion.
Pterion
- It is located in the temporal fossa.
- It is the junction between four bones:
the parietal bone
the squamous part of temporal bone
the greater wing of sphenoid bone
the frontal bone.
- The pterion is known as the weakest part of the skull.
- The anterior division of the middle meningeal artery runs underneath the pterion. Consequently, a traumatic blow to the pterion may rupture the middle meningeal artery causing an epidural haematoma.
Bregma
- The bregma is located at the intersection of the coronal suture and the sagittal suture on the superior middle portion of the calvaria. It is the point where the frontal bone and parietal bones meet.The bregma is known as the anterior fontanelle during infancy.
Inion
- The inion is the tip of external occipital protuberance, the midline bony prominance in the occipital bone where the ligamentum nuchae and trapezius muscle attaches.
Stephanion
- The point where the upper temporal line cuts the coronal suture is named the stephanion.