30 Questions
What is the main function of spinal nerves?
Connecting the CNS to sensory receptors, muscles, and glands
How many pairs of spinal nerves are there?
31 pairs
Where does the spinal cord end in relation to the vertebrae?
Near the level of the second lumbar vertebra
What is the arrangement called where the roots of the lumbar, sacral, and coccygeal nerves descend at an angle to reach their respective foramina before emerging from the vertebral column?
Cauda equina
What is the distribution of nerves that plexus identifies?
Cervical, brachial, lumbar, and sacral plexuses
What are spinal nerves wrapped in?
Several layers of connective tissue
Where do most of the spinal nerves emerge from the spinal cord?
Intervertebral foramina between adjoining vertebrae
Which nerve exits the vertebral canal between vertebrae C7 and T1?
Spinal nerve C8
What does a typical spinal nerve consist of?
Posterior root and anterior root
What do axons from the anterior rami of spinal nerves form?
Plexuses
Which plexus supplies the skin and muscles of the head, neck, and superior part of the shoulders and chest?
Cervical plexus
From which nerves do the phrenic nerves arise?
Cervical plexuses
Where does the coccygeal plexus emerge from?
Sacral canal via sacral hiatus
From which cervical nerves is the cervical plexus formed?
C1-C4
How many pairs of anterior and posterior sacral foramina do spinal nerves S1-S4 exit through?
Four
What is the clinical significance of dermatomes?
They help in diagnosing neurological conditions by identifying the areas of skin supplied by specific spinal nerves.
What is the function of the cauda equina?
To allow for continued nerve communication beyond the end of the spinal cord
What do spinal nerves connect?
Central nervous system to sensory receptors, muscles, and glands
What are spinal nerves wrapped in?
Several layers of connective tissue
Where does the spinal cord end in relation to the vertebral column?
Near the level of L2 vertebra
What is the distribution of nerves of the spinal plexuses?
Cervical, brachial, lumbar, and sacral plexuses
Which spinal nerves emerge from the spinal cord through the intervertebral foramina between adjoining vertebrae?
T1–L5
Where do the roots of the sacral spinal nerves and the coccygeal spinal nerves enter from the spinal cord?
Sacral canal
Which nerve supplies motor fibers to the diaphragm?
Phrenic nerve
Which pairs of anterior and posterior sacral foramina do spinal nerves S1–S4 exit via?
Four pairs
What do axons from the anterior rami of spinal nerves form?
Plexuses
From which cervical nerves is the cervical plexus formed?
C1–C4
Where does a typical spinal nerve unite to form a spinal nerve?
At the intervertebral foramen
Which part of the vertebral canal do spinal nerves T1–L5 exit below?
Below L5
What do axons from the anterior rami of adjacent nerves form?
Networks (plexuses)
Test your knowledge about the components, connective tissue coverings, and branching of spinal nerves. Also, explore the definition of plexus, distribution of nerves in various plexuses, and the clinical significance of dermatomes.
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