Which of the following statements are true of the embryonic and infant skull? (Read carefully and select all of the correct statements.)
A)The cranial bones are first made of cartilage.
B)The first site of bone matrix production is called a center of ossification.
C)All of the cranial bones form sutures just before birtH.
D)Bone matrix is produced by osteoclasts.
E)Fontanels are made of fibrous connective tissue, and they permit the compression of the skull during birth
F)All the fontanels become completely ossified within 2 months after birth.

Question

Quizplus · Accepted Answer

A) This statement is false. The cranial bones are first made of mesenchymal tissue, not cartilage.
B) This statement is true. The first site of bone matrix production is called a center of ossification. These centers appear in the cranial bones around the 8th week of fetal development.
C) This statement is false. The cranial bones are not fully ossified at birth, and the sutures between them allow for growth and expansion of the skull during development.
D) This statement is false. Bone matrix is produced by osteoblasts, not osteoclasts.
E) This statement is true. Fontanels are areas of the skull where the cranial bones have not yet fused, and they are made of fibrous connective tissue. They allow for flexibility and compression of the skull during birth.
F) This statement is false. Fontanels typically take several months to completely ossify, often not fully closing until 18-24 months after birth.

Which of the Following Statements Are True of the Embryonic