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Chapter 20: Problem 96

The number of lumbar vertebrae in human vertebral column is (a) 12 (b) 7 (c) 5 (d) 2

Short Answer

Expert verified
The number of lumbar vertebrae in the human vertebral column is 5.

Step by step solution

01

Understanding the Human Vertebral Column

First, it is essential to understand what the vertebral column is. The vertebral column, also known as the spinal column or backbone, supports the head and protects the spinal cord. It consists of vertebrae, which are individual bones separated by intervertebral discs.
02

Identify the Lumbar Vertebrae

The vertebral column can be divided into five sections: cervical, thoracic, lumbar, sacral and coccyx (tailbone). Lumbar vertebrae are located in the lower back.
03

Recall the Number of Lumbar Vertebrae

Recall or look up in relevant anatomy material that there are five lumbar vertebrae in a normal human vertebral column. This information is a fact and cannot be derived through calculations or logical reasoning, but through learning and memory of anatomical knowledge.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Lumbar Vertebrae
The lumbar vertebrae are a part of the vertebral column located in the lower back region. They are larger in size compared to the vertebrae in other parts of the spine due to their role in supporting most of the body's weight. This section of the spine is crucial for movement and stability.
  • There are five lumbar vertebrae, each numbered from L1 to L5.
  • These vertebrae are designed to handle significant pressure and stress, helping with actions like lifting, twisting, and bending.
  • The lumbar vertebrae have a thicker, more robust structure to accommodate their function.
Aside from weight support, the lumbar region is highly susceptible to injury due to its frequent use and the substantial strains it endures. Understanding their structure and function is vital for recognizing the importance of maintaining a healthy spine.
Vertebrae Anatomy
In vertebrae anatomy, each vertebra has a unique design based on its location in the vertebral column. The standard features of a vertebra include the vertebral body, the vertebral arch, and various processes.
  • The **vertebral body** is the anterior part and bears most of the body's weight.
  • The **vertebral arch** comprises the pedicles and laminae forming the protective structure around the spinal cord.
  • Processes such as spinous and transverse arise from the vertebral arch, providing attachment points for muscles and ligaments.
Each vertebral region has its unique characteristics: - Cervical vertebrae are small and allow for a wide range of motion. - Thoracic vertebrae have facets for rib articulation. - Lumbar vertebrae possess a larger body for more weight-bearing. In a healthy spine, all these anatomical components work together to safeguard the spinal cord and support mobility.
Spinal Column Structure
The spinal column is an essential part of human anatomy comprising 33 vertebrae in total. These are grouped into different regions: cervical, thoracic, lumbar, sacral, and coccygeal.
  • The **cervical spine** consists of 7 vertebrae, located in the neck and supporting the head.
  • The **thoracic spine** comprises 12 vertebrae, each articulating with a rib, contributing to the rib cage structure.
  • The **lumbar spine** has 5 vertebrae, assuming the major load-bearing role for the upper body.
  • The **sacral and coccygeal regions** have fused vertebrae, with the sacrum (5 fused) connecting the spine to the pelvis.
The structure of the spinal column provides both stability and flexibility, accommodating various movements while protecting the spinal cord. Intervertebral discs between vertebrae act as cushions, absorbing shocks and allowing the spine to bend and twist.

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