The Axial and Appendicular Skeletons

The Axial and Appendicular Skeletons - The Axial and...

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The Axial and Appendicular Skeletons The axial skeleton consists of the skull, vertebral column, and rib cage. The appendicular skeleton contains the bones of the appendages (limbs, wings, or flippers/fins), and the pectoral and pelvic girdles . The human skull, or cranium , has a number of individual bones tightly fitted together at immovable joints . At birth many of these joints are not completely sutured together as bone, leading to a number of "soft spots" or fontanels , which do not completely join until the age of 14-18 months. The vertebral column has 33 individual vertebrae separated from each other by a cartilage disk. These disks allow a certain flexibility to the spinal column, although the disks deteriorate with age, producing back pain. The sternum is connected to all the ribs except the lower pair. Cartilage allows for the flexibility of the rib cage during breathing. The arms and legs are part of the appendicular skeleton. The upper bones of the limbs are single: humerus (arm) and femur
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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