appendicular skeleton- forms the extremities and is composed of the shoulder girdle, arm bones, pelvic girdle, and leg bones.

axial skeleton- forms the main trunk of the body and is composed of the skull, spinal column, ribs, and breastbone.

carpals- wrist.

clavicles- collarbones.

cranium- is the spherical structure that surrounds and protects the brain.

diaphysis- long shaft.

endosteum- is a membrane that lines the medullary canal and keeps the yellow marrow intact.

epiphysis- two extremities or ends.

femur- thigh bone.

fibula- the slender smaller bone of the lower leg that attaches to the proximal end of tibia.

fontanels- spaces or soft spots that allows for the enlargement of the skull as brain growth occurs.

foramina- openings in bones that allow nerves and blood vessels to enter or leave the bone.

humerus- upper arm.

joints- areas where two or more bones join together.

ligaments- connective tissue bands.

medullary canal- cavity in the diaphysis.

metacarpals- palm of the hand.

metatarsals- instep of foot.

os coxae- hip bone.

patella- kneecap

periosteum- the outside of bone covered with a tough membrane.

phalanges- three on each finger and one on the thumb.

radius- lower arm on thumb side rotates round the ulna to allow the hand to turn freely.

red marrow- found in certain bones.

ribs- attach to the thoracic vertebrae on the dorsal surface of the body.

scapula- shoulder bones.

sinuses- air spaces in the bones of the skull that act as resonating chambers for the voice.

skeletal system- made up of organs called bones.

sternum- breastbone, bone of the axial skeleton.

sutures- areas where the cranial bones joined together.

tarsals- seven ankle

tibia- larger weight-bearing bone of the lower leg commonly called the shin bone.

ulna- larger bone of lower arm with a projection.

vertabrae- spinal columns composed of 26 bones.

yellow marrow- storage area for fat cells.