1 / 31

Bone Forces and Adaptations in the Postcranial Skeleton

Explore the forces acting on bones like compression, tension, shear, and torsion, and how bone adapts to different stress. Learn about evolutionary changes in the postcranial skeleton, forces impact on bone structure, and terrestrial life challenges.

jrutland
Download Presentation

Bone Forces and Adaptations in the Postcranial Skeleton

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Comparative Anatomy Evolution of the Postcranial Skeleton

  2. Functional units of the post-cranial skeleton. Visceal skeleton Vertebral column Ribs Sternum Girdles Paired appendages Unpaired appendages Evolution of the Postcranial Skeleton.

  3. Postcranial Skeleton • We need to know a little more about bone. • What sorts of forces operate on bony tissue? • Compression • Tension • Shear • Torsion

  4. Forces operating on bone • Examples • Compression……. Graviportal limbs of elephants. • Shear……………..Greater trochanter of the femur. • Torsion…………... Vertebrae & Femur • Tension………….. Sternum

  5. Forces operating on bone • Bone is living tissue, and accommodates whatever forces are applied to it. • As an example, someone who loses a lot of weight quickly will still possess a robust skeleton designed to carry a lot of weight. However, with time the skeleton will reabsorb a considerable amount of tissue and become more gracile.

  6. Forces acting on bone. • We can look at cross-sections of bone and determine exactly what kinds of forces were applied to the bone. • Note - a bone is not solid in cross section. • “force lines” within the bone become ossified for increased strength.

  7. Changes resulting from terrestrialization. • What are some of the problems associated with a terrestrial life style? • Support • Stability • Locomotion • Respiration • Dessication. • Note: some of these same issues are faced by aquatic forms as well.

  8. In an aquatic environment, the water acts as a skeleton. Terrestrial organism often have their mass arranged over only a few points of support.Compare and contrast the articulations of the 2 joints shown here.

More Related