How are spinal nerves named and numbered quizlet?

How are the spinal roots named?

The cervical spinal nerves are named according to vertebra above which they emerge. For example, the 4th cervical nerve emerges above the 4th vertebra. On the other hand, the thoracic, lumbar, sacral, and coccygeal spinal nerves are numbered according to vertebra below which they emerge.

How are spinal cord segments named?

The numbers refer to the spinal segments by which each nerve is named C = cervical; T = thoracic; L = lumbar; S = sacral spinal cord segments (dermatome).

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.

Which of the following numbers of pairs of spinal nerves is correct?


Term Formed by the union of cranial and a spinal root. Definition Accessory
Term Which of the following numbers of pairs of spinal nerves is correct? Definition twelve thoracic
Term Select the statement about plexuses that is most correct ________. Definition Only ventral rami form plexuses
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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.

What are the 6 types of spinal nerves?

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 many pairs of spinal nerves do humans have?

In total, there are 31 pairs of spinal nerves, grouped regionally by spinal region. More specifically, there are eight cervical nerve pairs (C1-C8), twelve thoracic nerve pairs (T1-T12), five lumbar nerve pairs (L1-L5), and a single coccygeal nerve pair.

What are two functions of spinal cord?

The main functions of the spinal cord are:

  • To conduct reflexes below the neck.
  • To conduct messages from the skin and muscles to the brain.
  • To conduct commands from the brain to muscles of the trunk and limbs.

What is the functional anatomy of the spinal cord?

Basic Anatomy of the Spinal Cord

The vertebral column is divided into cervical, thoracic or dorsal, lumbar, and sacrococcygeal vertebral segments. Each vertebral segment is formed by bony and cartilaginous components, known as a functional spinal unit (FSU).