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Medical Subject Headings

Skeletal System

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The Skeletal System 1 206 Bones in the Human Skeleton 2 Bones are Organs Each bone is a complex living organ made up of many cells, protein fibers, and minerals. They come in many sizes and shapes. The largest bone is the femur and the smallest is the stapes. The humerus is pictured here. 3 The femur is the thigh bone. The stapes is one of three small bones in the middle ear. The humerus is the upper arm bone. 3 The Skeletal System Also Includes Joints Cartilages Ligaments 4 Articular cartilage covers the ends of bones at articulations or joints Ligaments attach bones to other bones Tendons attach muscles to bones 4 5 Anatomy of the Skeletal System 5 Two Divisions of the Skeleton Axial Skeleton & Appendicular Skeleton 6

Intercostal Muscles

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INTERCOSTAL MUSCLES Inhalation and exhalation make up 1 breath Internal intercostal muscles External intercostal muscles Sternum Inhalation ? Also termed inspiration ? Diaphragm contracts and flattens. ? Internal intercostal muscles relaxes ? While the external intercostal muscles contract ? The rib cage moves up and out. ? Enlarging the thoracic cavity and decreases the air pressure within. ? Air from the surrounding enters the lungs Exhalation ? Also termed expiration ? Diaphragm relaxes and arch upwards. ? Internal intercostal muscles contracts ? While the external intercostal muscles relaxes ? The rib cage moves down and in. ? Air is forced out of the lungs Summary
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