206 named bones

1. axial skeleton
2. appendicular skeleton

80 bones

they lie around the longitudinal axis of the human body

skull bones, auditory ossicles, hyoid bone, ribs, sternum, and bones of the vertebral column

126 bones

upper and lower limbs (extremities), bones forming the girdles that connect the limbs to the axial skeleton

1. long
2. short
3. flat
4. irregular
5. sesamoid

-develop in certain tendons where there is considerable friction, tension, and physical stress, such as the palms and soles
-may vary in number from person to person

-are not always completely
ossified

-typically measure only a few millimeters

-notable exceptions are the two patellae (kneecaps),
large sesamoid bones
-functionally, sesamoid bones protect tendons from excessive
wear and tear, and they often change the direction of pull of a
tendon, which improves the mechanical advantage at a joint 

 -have greater length than width, consist of a shaft and a variable number of extremities, and are slightly curved for strength
-A curved bone absorbs the stress of the body’s weight at several different points, so that it is evenly distributed

-somewhat cube-shaped and are nearly equal in length and width

-consist of spongy bone tissue except at the surface, which has a thin layer of compact bone tissue.
Examples: carpal (wrist) bones, and the tarsal (ankle) bones

-somewhat cube-shaped and are nearly equal in length and width 

-they consist of spongy bone tissue except at the surface, which has a thin layer of compact bone tissue
Examples of short bones are the carpal (wrist) bones (except for
the pisiform, which is a sesamoid bone) and the tarsal (ankle)
bones (except for the calcaneus or heel bone, which is an irregular
bone).