Anatomy and Physiology Practice Exam 2026 – Complete Study Guide

In a normal adult human skeleton, there are 206 bones. This number reflects the standard count for adults, as the human skeleton undergoes changes throughout development. Infants are born with approximately 270 bones, but many of these bones fuse together during growth, resulting in the final count of 206 bones in adulthood.

The bones in the adult skeleton are categorized into two main groups: the axial skeleton, which includes the skull, vertebral column, and ribcage, and the appendicular skeleton, which comprises the limbs and the pelvic girdle. This classification and the total count are essential for understanding bone function, structure, and the anatomy of the human body.

Other counts, such as 254, 198, or 300, do not reflect the accurate composition of the adult skeleton and stem from either including additional structures like teeth or cartilage or simply reflecting the bone count in infants or other species.