The part of the vertebral body juts outs laterally on both sides and serves as a place for muscle attachment.

Question

BlackTom AI · Accepted Answer

Transverse processes are the lateral bony projections of a vertebra and serve as attachment sites for muscles and ligaments, so the correct choice is b. Transverse Process.

1) Relevant knowledge points and concepts
- Basic vertebral anatomy: each typical vertebra consists of a vertebral body (anterior), a vertebral arch formed by pedicles and laminae, and several processes (spinous and transverse) for articulation and soft-tissue attachment.
- Transverse processes: one projects laterally on each side from the junction of the pedicle and lamina; they serve as sites for muscle and ligament attachment and, in the thoracic region, articulate with ribs.
- Spinous process: a single posterior projection located at the midline; also an attachment site but not lateral on both sides.
- Lamina: paired plates that form the posterior part of the vertebral arch between transverse processes and spinous process; not lateral projections used primarily as flat structural elements.
- Annulus (annulus fibrosus): fibrous outer ring of an intervertebral disc, not a bony process.

2) Step-by-step reasoning
- The question describes “juts out laterally on both sides,” implying paired lateral projections.
- Among the answer choices, only the transverse processes are paired lateral projections present on both sides of a vertebra.
- The spinous process is a single midline projection (posterior), so it cannot be described as jutting out laterally on both sides.
- Laminae are flat plates forming part of the arch, not protruding laterally as processes for muscle attachment.
- The annulus is part of the intervertebral disc, not a vertebral bony projection.

3) Intermediate “steps” (conceptual)
- Identify feature type: bony projection used for muscle attachment → process.
- Location: lateral, bilateral → transverse process (not spinous).
- Function: muscle/ligament and (thoracic) rib articulation → matches transverse process.

4) Why the correct answer is correct
- The transverse processes are explicitly lateral, paired, and primary sites for muscle and ligament attachment; this directly matches the prompt.

5) Why other options are incorrect
- a. Spinous process: single, posterior, not lateral on both sides.
- c. Annulus: fibrous disc structure, not a bony projection.
- d. Lamina: part of the vertebral arch (flat plate), not a lateral process for muscle attachment.

6) Conclusion
The description matches the transverse process; therefore the correct answer is b. Transverse Process, as given.

The part of the vertebral body juts outs laterally on both sides and serves as a place for muscle attachment.单项选择题

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