Answer :
Final answer:
Lumbar enlargements in spinal segments T10-L2 have a higher density of motor neurons to control the lower limbs. These enlargements are less pronounced than cervical enlargements due to less fine motor control in the lower limbs. The lumbar vertebrae (L1-L5) supporting most of the body weight have larger structural features.
Explanation:
The lumbar enlargements being referred to are specific regions of the spinal cord associated with segments T10 through L2. These enlargements, located in the lumbar region of the vertebral column, feature a larger population of motor neurons within the ventral (anterior) horn. This is due to the greater number of muscles located in the lower limb which are under the control of these motor neurons.
Just as there is a lumbar enlargement, there also exists a cervical enlargement for the upper limbs, especially the fingers. Due to the less fine motor control of the lower limbs, the lumbar enlargement is not as visibly pronounced as the cervical enlargement. In comparison, the lumbar vertebrae, numbered L1 to L5, support the most substantial body weight and have larger structures such as the vertebral body, transverse processes, and articular processes.
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