What does the spinal nerve contain?
The spinal nerve contains motor and sensory nerve fibers to and from all parts of the body. Each spinal cord segment innervates a dermatome (see below and Figure 3.5). Similar cross-sectional structures at all spinal cord levels (Figure 3.1).
What do spinal nerves attach to?
Each spinal nerve is connected to the spinal cord by the dorsal (sensory) and ventral (motor) nerve roots (Fig. 2.11). The axons of the basal plate neurons (motor neurons) pass through the marginal layer and form the ventral or motor root of spinal nerve.
What areas of the body do spinal nerves innervate?
The cervical spinal nerves innervate the muscles and provide sensation for the head, neck, and diaphragm, as well as the upper limbs and back. The lumbar, sacral, and coccygeal nerves combine to form the lumbosacral plexus.
Which spinal nerves affect which parts of the body?
The nerves of the cervical spine go to the upper chest and arms. The nerves in your thoracic spine go to your chest and abdomen. The nerves of the lumbar spine then reach to your legs, bowel, and bladder. These nerves coordinate and control all the body’s organs and parts, and let you control your muscles.
What part of the spine controls the heart?
Thoracic (mid back) – the main function of the thoracic spine is to hold the rib cage and protect the heart and lungs. The twelve thoracic vertebrae are numbered T1 to T12.
Where do nerves come out of the spine?
The nerve roots pass out of the spinal canal through the intervertebral foramen, where they feed the body either anteriorly (motor) or posteriorly (sensory). The anterior divisions supply the front of the spine including the limbs.
Nerve Structures of the Spine.
|SPINAL CORD||31 Pairs – Spinal Nerves|
What are the 31 spinal nerves and functions?
A total of 31 pairs of spinal nerves control motor, sensory, and other functions. These nerves are located at the cervical, thoracic, lumbar, sacral, and coccygeal levels. Spinal nerves can be impacted by a variety of medical problems, resulting in pain, weakness, or decreased sensation.
How does damage to the spinal cord and nerves affect the other parts of the body?
A spinal cord injury stops the flow of messages below the site of the injury. The closer the injury is to the brain, the more of the body is affected. Injury to the middle of the back usually affects the legs (paraplegia). Injury to the neck can affect the arms, chest, and legs (quadriplegia).
What happens if you cut a mixed spinal nerve?
Injuries to the spinal cord can cause weakness or complete loss of muscle function and loss of sensation in the body below the level of injury, loss of control of the bowels and bladder, and loss of normal sexual function.