Which vertebrae are atypical

Thoracic vertebrae are the strong vertebrae located in the middle of the vertebral column between the cervical and the lumbar vertebrae. Out of the twelve of them, five are atypical. Here, T1 is the superior-most thoracic vertebra, which contains a complete facet for the first rib as well as a demi-facet for the second rib.

Figure 3: Atypical Thoracic Vertebrae. Besides, T1 has a straighter spinous process, more closely resembling C7. Also, T9 does not contain inferior demi-facet to connect to the T Additionally, T10, T11, and T12 have a single costal facet to articulate with their respective ribs.

Moreover, T11 and T12 have similar spinous processes, which are shorter and posteriorly-oriented. Lumbar vertebrae are the largest and heavier vertebrae occur below thoracic vertebrae. Also, their main characteristic feature is the large vertebral body.

However, L5 is the only atypical vertebrae among the other 5 lumbar vertebrae. Generally, it has the largest vertebral body as well as transverse processes. Also, it has the most inferiorly located discovertebral unit. Typical vertebrae refer to the vertebrae, consisting of a body, vertebral arch, and several processes while atypical vertebrae refer to the vertebrae whose structure is highly modified by function and position.

Cervical vertebrae, thoracic vertebrae, lumbar vertebrae, sacrum, and coccyx are the types of vertebrae occur in the vertebral column while the cervical vertebrae, C1, C2, and C7, thoracic vertebrae, T1, T9, T10, T11, and T12, lumbar vertebrae, L5 are atypical vertebrae.

Vertebrae occur in the middle portion of the cervical, thoracic, and lumbar vertebrae, the sacrum, and the coccyx are typical vertebrae while atypical vertebrae occur in the transitioning regions of the vertebral column. Typical vertebrae are the vertebrae of the vertebral column, consisting of the general structure of a vertebra.

Also, this includes the presence of a vertebral body, vertebral arch, and transverse processes. However, the transitioning regions of the cervical, thoracic, and lumbar vertebrae contain atypical vertebrae with specific structures. Spine , Musculoskeletal. URL of Article. T1 bears some resemblance to low cervical vertebrae T9 has no inferior demifacet T10 often, but not always, shares features with T11 and T Quiz questions. DSc SSP. Gray's Anatomy. Churchill Livingstone.

Read it at Google Books - Find it at Amazon 2. Last's Anatomy. Read it at Google Books - Find it at Amazon 3. McMinn and Abrahams' clinical atlas of human anatomy.

Read it at Google Books - Find it at Amazon 4. Snell RS. Clinical Anatomy By Regions Internationa. They articulate with the head of the numerically corresponding rib. The inferior costal facets are smaller and placed on the lower border in front of the inferior vertebral notch. They articulate with the next lower rib. It resembles a typical thoracic vertebra except that the body has only the superior costal facets demifacets.

The inferior costal facets are absent.