PG NEXT Question of the Day 28-10-2016
Question:
The marked structure shown in the photograph closes at the age of
a. 6 months
b. 2 years
c. 3 years
d. 6 years
Ans : b. 2 years
Ref: Essentials of human Anatomy, part-II, A.K.Datta,5th edition,page – 14
Explanation:
• The marked structure is metopic suture between two halves of frontal bones
• Each half of frontal bone ossifies from one primary centre around the age of 8th week of intrauterine life
• At birth, 2 halves of frontal bone are united by Metopic suture (fibrous joint)
• Metopic suture is completely replaced by bone at about 2 years
• Premature closure of metopic suture is – Trigonocephaly