Question
Download Solution PDFHow many pairs of nerves arise from the spinal cord?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is 31
Key Points
- The nerves arising directly from the spinal cord are called the spinal nerves. T
- There are 31 pairs of spinal nerves in humans: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal.
- They are a part of the peripheral nervous system.
- Each pair connects the spinal cord with a specific region of the body.
- Near the spinal cord each spinal nerve branches into two roots.
- One, composed of sensory fibres, enters the spinal cord via the dorsal root; its cell bodies lie in a spinal ganglion that is outside the spinal cord.
- The other, composed of motor fibres, leaves the spinal cord via the ventral root; its cell bodies lie in specific areas of the spinal cord itself.
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