18 Questions
What is the main functional purpose of the lumbar vertebrae in the human body?
Supporting the weight of the trunk positioned above it
Which part of the spine sustains approximately 30% of the compressive loads when the spine is in hyperextension?
Facet joints
Where are contact forces largest within the spine according to the text?
Facet joints at L5-S1
What provides about 80% of the spine's ability to resist rotational torsion and shear?
Facet joints
What structures are symphysis joints with fibrocartilaginous discs acting as cushions?
Intervertebral discs
What accounts for approximately one-fourth of the height of an adult's spine?
Intervertebral discs
What is the primary function of the ligamentum flavum in the spine?
To enhance spinal stability
Which type of fibers are predominantly found in the ligamentum flavum, making it unique from other spinal ligaments?
Elastic fibers
What is the term used to describe the slight, constant compression in the intervertebral discs due to the tension in the ligamentum flavum?
Prestress
Which spinal curves are present at birth and are referred to as primary curves?
Thoracic and sacral curves
What is the term used to describe the process by which bones are shaped in response to forces acting on them?
Modeling
During which growth period does the curvature of the lumbar spine increase approximately 10%?
Between the ages of 7 and 17
What is the term for the functional unit of the spine consisting of two adjacent vertebrae and the soft tissues between them?
Motion segment
Which type of joint are the right and left facet joints between the superior and inferior articular processes of adjacent vertebrae?
Diarthrosis of gliding type
What serves as the primary weight-bearing component of the spine?
Vertebral bodies
What is the structure formed by the neural arches, posterior side of the bodies, and intervertebral discs for protecting the spinal cord?
Vertebral canal
Which region of the spine exhibits a progressive increase in vertebral size from the cervical to lumbar region?
Lumbar region
What is the purpose of the first two cervical vertebrae known as atlas?
Provide a receptacle for condyles of the occiput
Learn about the biomechanics of the lumbar spine, including the structure and function of the cervical, thoracic, lumbar, sacral, and coccygeal vertebrae. Understand the concept of motion segments and the role of intervertebral discs in spine functionality.
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