What are the segments of the spinal vertebrae?
What are the segments of the spinal vertebrae?
The spinal cord is located in the vertebral foramen and is made up of 31 segments: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral and 1 coccygeal. A pair of spinal nerves leaves each segment of the spinal cord.
What vertebral level does the spinal cord end at?
In human, the spinal cord ends at L2 vertebral level. The tip of the spinal cord is called the conus. Below the conus, there is a spray of spinal roots that is frequently called the cauda equina or horse’s tail. Injuries to T12 and L1 vertebra damage the lumbar cord.
What is a vertebral segment?
A vertebral segment represents a single complete vertebral bone with its associated articular processes and laminae. Although the bones of the vertebral column are stacked on top of each other, they don’t actually rest on each other. “Think of the segment as two bones and the space between,” says Pollock.
What is spinal segment?
A spinal segment is defined by dorsal roots entering and ventral roots exiting the cord, (i.e., a spinal cord section that gives rise to one spinal nerve is considered as a segment.) (Figure 3.4). Figure 3.4. (A) Drawing of the spinal cord with its spinal roots.
How many spinal segments are there?
The spine is divided into 33 segments, 24 of which are mobile. Working from the top downwards, the cervical spine is the portion of the spine within the neck, and consists of 7 vertebrae (C1 to C7).
How do you count vertebral segments?
When counting vertebral segments, be mindful that a single interspace sits between two vertebral segments. For instance, the span C6-T2 contains four vertebral segments (C6, C7, T1, and T2) and three vertebral interspaces (C6/C7, C7/T1, and T1/T2).
Why does the spinal cord end at L1 and L2?
While it seems somewhat counterintuitive that the spinal cord would end at the level of the first or second lumbar vertebra, (as is often the case in anatomy) the explanation lies in the embryological development of the spinal cord. It is these spinal nerve roots that compose the cauda equina beyond L1/L2.
What level does the spinal cord end in adults?
In adults, the cord terminates at the level of L1-L2. Thus the cord spans within 20 bony vertebrae. In a child, it terminates at the upper border of L3.
How many segments are in the vertebral column?
Does the spinal cord end at L1 2?
The spinal cord ends around the L1 or L2 vertebrae in adults, forming the conus medullaris. The horsetail shaped area, which extends past the conus medullaris, is called the cauda equina.
What are the segments of the spinal cord?
The spinal cord is located in the vertebral foramen and is made up of 31 segments: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral and 1 coccygeal. A pair of spinal nerves leaves each segment of the spinal cord.
Does the spinal cord pass through the body of each vertebra?
The spinal cord passes through foramen of each vertebra. The anterior arch is called the vertebral body. Discs connect one vertebral body to another to allow motion of the spine and cushion it against heavy loads. Together, the vertebral bodies and discs bear about 80 percent of the load to the spine.
What does a vertebral segment consist of?
Vertebral body is the thick oval segment of bone forming the front of the vertebra also called the centrum . The cavity of the vertebral body consists of cancellous bone tissue and is encircled by a protective layer of compact bone.
What is a spinal segment?
spinal seg·ment | \\ -ˈseg-mənt \\. : a segment of the spinal cord including a single pair of spinal nerves and representing the spinal innervation of a single primitive metamere.