Podcast Beta
Questions and Answers
What percentage of the entire height of the vertebral column do intervertebral disks constitute?
What role do intervertebral disks play in the vertebral column?
What percentage of the total disc area does the nucleus pulposus occupy in cross-section?
What is the characteristic of the nucleus pulposus that makes it expand outwardly under pressure?
Signup and view all the answers
What type of loads is the annulus fibrosus particularly suited to resist?
Signup and view all the answers
Why are the posterior laminallae of the annulus fibrosus thinner than the anterior laminallae?
Signup and view all the answers
What type of cartilage makes up the cartilaginous end plates?
Signup and view all the answers
What is the consequence of the posterior location of the nucleus pulposus in adult disks?
Signup and view all the answers
What is the primary function of the vertebral bodies in the vertebral column?
Signup and view all the answers
What is the thickness of the intervertebral disk in the lumbar region?
Signup and view all the answers
What is the ratio of the thickness to the height of the vertebra in the cervical region?
Signup and view all the answers
What is the functional unit of the vertebral column?
Signup and view all the answers
What is the main reason for the vertebral bodies in the lumbar region being thicker and wider?
Signup and view all the answers
What is the mechanical and functional importance of the intervertebral disc?
Signup and view all the answers
What is the primary function of the vertebral column?
Signup and view all the answers
What is the arrangement of trabecular bone within the vertebral bodies?
Signup and view all the answers
What is the component of the motion segment that consists of the vertebral bodies and intervertebral disc?
Signup and view all the answers
What is the purpose of the facets on the vertebrae?
Signup and view all the answers
How many vertebrae make up the human spinal column?
Signup and view all the answers
What is the term for the functional unit of the spine?
Signup and view all the answers
What is the component of the vertebral body that fails first under excessive loading?
Signup and view all the answers
What is the orientation of the trabecular arrangement within the vertebral bodies?
Signup and view all the answers
What percentage of loads on the spine can intra-abdominal pressure reduce?
Signup and view all the answers
What is the importance of maintaining the natural curves in the back while lifting?
Signup and view all the answers
What is the advantage of tightening abdominal muscles before lifting an object?
Signup and view all the answers
Why is it important to test the weight of an object before lifting it?
Signup and view all the answers
What is the advantage of keeping objects close to the body while lifting?
Signup and view all the answers
Why is it recommended to pivot with the feet instead of twisting the spine while lifting?
Signup and view all the answers
What is the advantage of using a cart for heavy items?
Signup and view all the answers
What happens to the compressive loads at the L3L4 motion segments during normal walking?
Signup and view all the answers
What is the primary function of the disc in the motion segment?
Signup and view all the answers
What is the approximate pressure in a disc loaded in compression?
Signup and view all the answers
What type of stress is primarily produced in the disc during rotation?
Signup and view all the answers
What is a mechanical factor that favours herniated disc?
Signup and view all the answers
What percentage of the compressive load do the facets carry when the person is in the upright standing posture?
Signup and view all the answers
What happens to the load-sharing between the facets and the disc when the spine is in flexion?
Signup and view all the answers
What is the primary role of the postural muscles during standing?
Signup and view all the answers
What is the approximate percentage of the anterior shear load on the spine in torsion carried by the facets?
Signup and view all the answers