Chapter 13: Skeletal and Muscular Systems

Chapter 13: Skeletal and Muscular Systems

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

MULTIPLE CHOICE

Directions: Each group of questions below consists of a numbered list of descriptive words or phrases accompanied by a diagram with certain parts indicated by letters or by a list of lettered headings. For each numbered word or phrase, select the lettered part or heading that matches it correctly and then insert the letter in the space to the right of the appropriate number. Sometimes more than one numbered word or phrase may be correctly matched to the same lettered part or heading.

1. ________ Closes during the second year

ANS:   D

The anterior fontanelle, located where the two parietal bones and the halves of the frontal bone meet, usually closes about the middle of the second year. Palpation of this fontanelle during infancy gives information about ossification of the cranium and intracranial pressure.

2. ________ Forms by intramembranous ossification

ANS:   C

The frontal bone, part of the membranous neurocranium, develops by intramembranous ossification from two primary centers. The halves of the frontal bone begin to fuse during the second year, and the frontal (metopic) suture usually is obliterated by the eighth year.

3. ________ Partly within the pharyngeal arches

ANS:   E

The ends of the cartilaginous rods in the first and second pairs of pharyngeal arches reach the ventral surface of the neurocranium in the region of the developing ears. Later, they undergo endochondral ossification to form the lesser horns and the superior part of the body of the hyoid bone.

4. ________ Growth of long bones

ANS:   B

During the later stages of postnatal bone growth, the mass of cartilage between the diaphysis and epiphysis decreases in thickness to form a comparatively thin cartilage, the epiphysial cartilage plate. This plate is of importance for growth of long bones. At the termination of growth in the bone, the epiphysial plate disappears and the epiphysis unites with the diaphysis.

5. ________ Primary ossification center