The word "thoracic vertebrae" refers to the bones that make up the middle segment of the spinal column. It is spelled as /θəˈræsɪk vɜrˈtɪbri/ in IPA phonetic transcription. The first part of the word, "thoracic," is pronounced with a voiced th sound (θ), followed by a schwa (ə) and then the stress falls on the second syllable, which is pronounced as "ras" (æs). The second word, "vertebrae," is pronounced with stress on the second syllable, with the middle sound being a schwa (ɜ) followed by "t" (t) and the final syllable, "brae" (bri).
The thoracic vertebrae are a series of 12 vertebrae located in the middle portion of the vertebral column or spine. These vertebrae form the thoracic region of the spine, also known as the chest region. They are situated between the cervical vertebrae in the neck and the lumbar vertebrae in the lower back.
The thoracic vertebrae are characterized by several unique features. Unlike the cervical vertebrae, they possess facets on their vertebral bodies to articulate with the ribs, forming numerous connections that contribute to the overall stability of the ribcage. These connections allow for limited movement and provide protection to the vital organs housed within the chest, such as the heart and lungs.
Each thoracic vertebra consists of a vertebral body at its anterior portion, which supports the weight placed on the thoracic region. Additionally, they possess a neural arch, which forms a protective enclosure for the spinal cord. The neural arch includes various bony processes, such as the spinous and transverse processes, that serve as attachment points for muscles, ligaments, and other structures.
The thoracic region is crucial for maintaining proper posture, stability, and protecting vital organs. It contributes to the overall movement of the spine, allowing for rotation and flexion, although it offers less mobility compared to the cervical and lumbar regions. Due to its complex anatomy and the presence of ribs, the thoracic vertebrae play a significant role in the structural integrity and overall functionality of the chest region.
The word "thoracic" is derived from the Latin word "thorax", which means "chest" or "breastplate". The term "vertebrae" comes from the Latin word "vertebra", meaning "joint" or "joint of the spine". When combined, "thoracic vertebrae" refers to the individual bones that make up the thoracic region of the spine, which corresponds to the chest area.