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Questions and Answers
What type of fibers does the posterior root of a spinal nerve contain?
What type of fibers does the posterior root of a spinal nerve contain?
- Mixed fibers
- Sympathetic fibers
- Sensory fibers (correct)
- Motor fibers
What forms the spinal nerve at the intervertebral foramina?
What forms the spinal nerve at the intervertebral foramina?
- Union of the posterior and anterior roots (correct)
- Only the posterior root ganglion
- The dorsal ramus and ventral ramus
- Anterior root only
Which ramus supplies muscles and skin of the back?
Which ramus supplies muscles and skin of the back?
- Posterior ramus (correct)
- Anterior ramus
- Lumbar ramus
- Cervical ramus
Where are the cell bodies of sensory neurons located in the spinal nerve system?
Where are the cell bodies of sensory neurons located in the spinal nerve system?
What happens to a spinal nerve after passing through the intervertebral foramen?
What happens to a spinal nerve after passing through the intervertebral foramen?
What does the anterior ramus supply?
What does the anterior ramus supply?
Which spinal nerves do not form plexuses?
Which spinal nerves do not form plexuses?
Which of the following is NOT a plexus formed by the anterior rami?
Which of the following is NOT a plexus formed by the anterior rami?
From which spinal nerves does the lumbar plexus arise?
From which spinal nerves does the lumbar plexus arise?
Which plexus includes contributions from the L4-L5 spinal nerves?
Which plexus includes contributions from the L4-L5 spinal nerves?
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Study Notes
Spinal Nerve Formation
- Spinal nerves connect to the spinal cord through two roots: the posterior/dorsal root and the anterior/ventral root
- The posterior root contains sensory fibers, carrying information from the body to the spinal cord
- The anterior root contains motor fibers, carrying commands from the spinal cord to muscles
- The posterior root ganglion, located on the posterior root, houses the cell bodies of sensory neurons
- Spinal nerves are formed by the union of the posterior and anterior roots at the intervertebral foramina
- After exiting the intervertebral foramen, each spinal nerve divides into two branches: the posterior (dorsal) ramus and the anterior (ventral) ramus
- The posterior ramus innervates the muscles and skin of the back
Spinal Nerve Anatomy & Embryology
- The anterior (ventral) ramus supplies muscles and structures of the limbs, as well as the skin of the lateral and anterior trunk
- Most anterior rami, except for the thoracic nerves (T2-T12), form nerve plexuses
Nerve Plexuses
- Cervical plexus (C1-C4)
- Brachial plexus (C5-C8 and T1)
- Lumbar plexus (L1-L4)
- Sacral plexus (S1-S4 and contributions from L4-L5)
- Coccygeal plexus (S4, S5, and Cox1)
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