CLASSWORK. Ch. 7.4 Skeletal System Key Terms
Humerus
The upper arm bone.
Metatarsals
The bones that form the instep of the foot.
Radius
The bone of the lower arm on the thumb side that rotates around the ulna to allow the hand to turn freely.
Skeletal system
Divided into two parts: the axial skeleton and the appendicular skeleton.
Ulna
The larger bone of the lower arm with a projection called the olecranon process at its upper end, forming the elbow.
Joints
Areas where two or more bones join together.
Os coxae
The hip bone.
Red marrow
Found in some bones
Sternum (or breastbone)
The last bone of the axial skeleton.
Vertebrae
The bones of the spinal column.
Ligaments
Connective tissue bands that hold long bones together at joints.
Patella
The kneecap.
Ribs
They attach to the thoracic vertebrae.
Sutures
The areas where the cranial bones have joined together.
Yellow marrow
Fills the medullary canal. It is mainly a storage area for fat cells.
Medullary canal
A cavity in the diaphysis (the long, straight shaft of a long bone).
Periosteum
A thin layer of vascular tissue that contains osteoblasts (cells that form new bone tissue).
Scapulas (shoulder blades
along with the two clavicles, form the shoulder girdle and are for the attachment of the upper arm bones.
Tarsals
The ankle bones.
Diaphysis
The long, straight shaft of a long bone.
Metacarpals
The bones that form the palm.
Phalanges
The bones of the fingers and toes.
Sinuses
Air spaces in the bones of the skull that act as resonating chambers for the voice. They are lined with mucous membranes.
Tibia
The larger weight-bearing bone of the lower leg, commonly called the shin bone.
Endosteum
A membrane that lines the medullary canal and keeps the yellow marrow intact.