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Key Terms

Skeletal System

QuestionAnswer
Skeletal System Made up of organs called bones (206 in adult human). Act as a framework, protect, level, store and protect blood cells.
Diaphyris Shaft, or middle section, of the long bone
Epiphysis Two extremities or ends of the long bone
Medullary Canal Cavity in the diaphysis that contains yellow marrow
Yellow Marrow Made up mainly of fat cells. Fill the medullary canal.
Endosteum Membrane that lines the medullary canal and keeps the yellow marrow intact
Red Marrow Found in certain bones such as the vertebrae, ribs, sternum, and cranium; and in the proximal ends of the humerus and femur. It produces red blood cells, platelets, and white blood cells.
Periosteum Though membrane that covers the outside of the bone ehich contains blood and lymph vessels and osteobalsts (special cells that form new bone tissue)
Axial Skeleton Forms the main trunk of the body; composed of the skull, spinal column, ribs and breastbone.
Appendicular Skeleton Forms the extremities and is composed of the shoulder or girdle, arm bone, pelvic girdle, and leg bones.
Cranium Spherical structure that surrounds brain and protects it.
Fontanels "Soft spots" in the cranium at birth; spaces that allow for the enlargement of the skull as the brain grows. Made of membrane and cartilage.
Sutures Areas where the cranial bone have joined together
Sinuses Air spaces in the bones of the skull that act as resonating chambers for the voice. They are lined with mucus.
Foramina Openings in the bone that allow nerves and blood vessels to enter or leave the bone.
Vertebrae Spinal column made of 26 bones. Bones that protect the spinal cord and provide support for the head and trunk.
Ribs Attach to the thoraci vertebrae on the dorsal surface of the body. 12 pairs, also called castae.
Carpals Bones of the wrist. 8 per hand.
Clavicles collarbones; there are 2.
Femur Thigh bone; 1 per leg
Fibula Lower leg bone; 1 per leg.
Foramina openings in bones that allow nerves and blood vessels to enter or leave the bone
Humerus upper arm bone; 1 per arm
Joints Areas where 2 or more bones join together.
Ligaments connective tissue bands that help hold long bones together at joints.
Metacarpals bone at the plam of the hand
Metatarsals bone at the insetp of the foot.
Os coxae two coxal, or hip bones, that join togetehr the sacrum of the dorsal part of the body and make up the pelvic girdle.
Patella Kneecap; 1 per leg
Phalanges Finger bones; 14 per hand.
Radius Lower amr on the thumb side; 1 per hand.
Scapula 2 shoulder bones
Sternum breast bone
Tarsals Ankle bones. 7 per foot.
Tibia lower leg bone (bigger one)
Ulna Larger bone of the lower arm with a projection called olecranon process at its upper end forming an elbow.
Created by: dp
 

 



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