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Questions and Answers
At what level does the spinal cord end in an adult?
At what level does the spinal cord end in an adult?
- Level of the disc between L1/2 vertebrae (correct)
- Level of the disc between T12/L1 vertebrae
- Level of the disc between L2/3 vertebrae
- Level of the disc between L3/L4 vertebrae
What is the length of the spinal cord in females?
What is the length of the spinal cord in females?
- 45 cm
- 42 cm (correct)
- 40 cm
- 48 cm
At what level does the spinal cord end at birth?
At what level does the spinal cord end at birth?
- Level of L3 vertebra (correct)
- Level of L4 vertebra
- Level of T12 vertebra
- Level of L2 vertebra
Which part of the spinal cord gives origin to the brachial plexus of the upper limb?
Which part of the spinal cord gives origin to the brachial plexus of the upper limb?
What occupies the upper 2/3 of the vertebral canal?
What occupies the upper 2/3 of the vertebral canal?
How many pairs of spinal nerves originate from the lumbar segments?
How many pairs of spinal nerves originate from the lumbar segments?
What type of fibers does the dorsal root contain?
What type of fibers does the dorsal root contain?
Where do the ventral and dorsal roots unite to form the spinal nerve trunk?
Where do the ventral and dorsal roots unite to form the spinal nerve trunk?
What do the primary rami of the spinal nerve supply?
What do the primary rami of the spinal nerve supply?
What is the function of the dorsal root ganglion?
What is the function of the dorsal root ganglion?
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Study Notes
Spinal Cord Characteristics
- The spinal cord typically ends at the level of L1 (first lumbar vertebra) in an adult.
- The length of the spinal cord in females is approximately 42-45 cm.
Fetal Development
- At birth, the spinal cord ends at the level of L3 (third lumbar vertebra).
Brachial Plexus Origin
- The C5-T1 spinal cord segments give origin to the brachial plexus of the upper limb.
Vertebral Canal Composition
- The upper 2/3 of the vertebral canal is occupied by the spinal cord.
Lumbar Segments
- There are 5 pairs of spinal nerves that originate from the lumbar segments.
Dorsal Root Composition
- The dorsal root contains sensory fibers.
Spinal Nerve Formation
- The ventral and dorsal roots unite to form the spinal nerve trunk in the intervertebral foramen.
Primary Rami Function
- The primary rami of the spinal nerve supply the corresponding dermatomes.
Dorsal Root Ganglion Function
- The dorsal root ganglion is responsible for transmitting sensory information from the periphery to the spinal cord.
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