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Vertebral Column: Regions and Curvature01:16

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The vertebral column or spine is a flexible column that supports the head, neck, and body and  allows for their movements. It also protects the spinal cord.
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A typical vertebra, with the exception of the sacrum and coccyx, consists of a body, a vertebral arch, and seven different projections termed processes. The anterior portion of the vertebrae, the body, supports about half the body’s weight. The vertebral bodies progressively increase in size and thickness from the cervical region to the lumbar region of the vertebral column. The intervertebral discs present between the bodies of adjacent vertebrae firmly unites them, forming a continuous...
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The back muscles that lie deep into the thoracolumbar fascia are called intrinsic or true back muscles. These muscles are divided into four layers: superficial, intermediate, deep, and deepest layers.
Superficial Layer:
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In addition to being held together by the intervertebral discs, adjacent vertebrae also articulate with each other at synovial joints formed between the superior and inferior articular processes called zygapophysial joints (facet joints). These are plane joints that provide for only limited motions between the vertebrae. The orientation of the articular processes at these joints varies in different regions of the vertebral column and serves to determine the types of motions available in each...
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The superior view of the cranium shows the frontal and paired parietal bones.
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The elephant backbone: Morphological differences, dorsostability, and vertebral fusions.

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Elephants exhibit remarkable vertebral column stability, with limited backbone mobility compared to other mammals. This unique structure supports their immense size and powerful movements.

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Area of Science:

  • Paleontology
  • Comparative Anatomy
  • Biomechanics

Background:

  • The vertebral column of elephants possesses unique morphological and functional characteristics distinguishing them from other mammals.
  • Understanding elephant spinal anatomy is crucial for comparative studies with extinct relatives and other large herbivores.

Purpose of the Study:

  • To investigate the functional morphology and intervertebral mobility of the elephant backbone.
  • To compare elephant spinal features with other large herbivores and extinct proboscideans (Mammuthus primigenius, M. trogontherii, and Mammut americanum).

Main Methods:

  • Comparative analysis of vertebral column morphology and mobility across different elephantid species and related mammals.
  • Examination of functional aspects including dorsostability, intervertebral mobility in sagittal, lateral, and axial planes, and spinal curvature.

Main Results:

  • Elephant vertebral columns display exceptional dorsostability with the lowest known amplitudes of intervertebral motion in mammals.
  • Limited mobility in the neck, thoracic, and lumbar regions is compensated by trunk structure and musculature; lumbosacral joint shows reduced mobility.
  • An arch-shaped thoracic-lumbo-sacral region provides static support, with spinous process morphology varying among taxa but not significantly affecting sagittal flexibility.

Conclusions:

  • The elephant's vertebral column is highly adapted for stability, with specialized structures supporting its massive body.
  • Differences in spinal morphology, particularly the arch shape and ligamentous support, likely relate to maintaining posture and enabling powerful movements in elephants and mammoths.