Transverse ligament of atlas is part of –
**Core Concept**
The transverse ligament of atlas is a critical anatomical structure that plays a vital role in stabilizing the atlanto-axial joint, which is a synovial joint between the atlas (C1) and axis (C2) vertebrae in the cervical spine. The transverse ligament is a strong fibrocartilaginous ligament that connects the two lateral masses of the atlas, thereby preventing excessive movement of the atlas on the axis.
**Why the Correct Answer is Right**
The transverse ligament of atlas is a part of the dens (odontoid process) of the axis. It encircles the dens and prevents it from being displaced anteriorly or posteriorly. The ligament is attached to the anterior tubercles of the lateral masses of the atlas and is continuous with the anterior longitudinal ligament. The transverse ligament is a vital structure that helps maintain the integrity of the atlanto-axial joint and prevents excessive movement of the atlas on the axis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the transverse ligament of atlas is not a part of the posterior longitudinal ligament. The posterior longitudinal ligament is a fibrocartilaginous ligament that runs along the posterior surface of the vertebral bodies and intervertebral discs.
**Option B:** This option is incorrect because the transverse ligament of atlas is not a part of the anterior longitudinal ligament. The anterior longitudinal ligament is a fibrocartilaginous ligament that runs along the anterior surface of the vertebral bodies and intervertebral discs.
**Option D:** This option is incorrect because the transverse ligament of atlas is not a part of the ligamentum flavum. The ligamentum flavum is a fibroelastic ligament that connects the laminae of adjacent vertebrae and helps maintain the integrity of the posterior spinal elements.
**Clinical Pearl / High-Yield Fact**
The transverse ligament of atlas is an essential anatomical structure that helps maintain the stability of the atlanto-axial joint. Injury or disruption of this ligament can lead to atlanto-axial instability, which can result in catastrophic consequences, including spinal cord injury or death.
**Correct Answer:** C.