Two regions of the spinal cord are enlarged to accommodate the greater number of nerve cells and connections needed to process information related to the upper and lower limbs (see Figure 1.10B).
What level is lumbar enlargement?
The lumbar enlargement is 8 cm long from T9 to T12 and in continuity with the conus medullaris, which tapers off at the level of the L1–2 disc space into the filum terminale, an atrophic remnant of the caudal segment of the embryonic spinal cord.
What causes the spinal enlargements?
being on a level with the attachment of the sixth pair of cervical nerves. The reason behind the enlargement of the cervical region is because of the increased neural input and output to the upper limbs. An analogous region in the lower limbs occurs at the lumbar enlargement.
Where are the cervical and lumbar enlargements?
Two enlargements of the spinal cord can be visualized: The cervical enlargement, which extends between C3 to T1; and the lumbar enlargements which extends between L1 to S2 (Figure 3.1).
What is the function of lumbar enlargement?
The lumbar enlargement (or lumbosacral enlargement) is a widened area of the spinal cord that gives attachment to the nerves which supply the lower limbs.
What is the significance of cervical and lumbar enlargements?
The cervical and lumbar regions of the spinal cord show a larger diameter compared to the rest of the regions. The cervical enlargement and lumbar enlargement represent an increased amount of neurons in the gray matter and axons in the white matter that serve the upper limbs and lower limbs, respectively.
Where do lumbar nerves go?
They arise from the spinal cord between each pair of lumbar spinal vertebrae and travel through the intervertebral foramina. The nerves then split into an anterior branch, which travels forward, and a posterior branch, which travels backwards and supplies the area of the back.
How many lumbar nerves are there?
There are five lumbar nerve pairs. The first of these nerve roots exits between L1 and L2. There are five sacral nerve pairs. The first nerve root exits between S1 and S2.
Is Spinal stenosis a degenerative disease?
Lumbar spinal stenosis is a narrowing of the spinal canal, compressing the nerves traveling through the lower back into the legs. While it may affect younger patients, due to developmental causes, it is more often a degenerative condition that affects people who are typically age 60 and older.
Does pia mater contain CSF?
Function. In conjunction with the other meningeal membranes, pia mater functions to cover and protect the central nervous system (CNS), to protect the blood vessels and enclose the venous sinuses near the CNS, to contain the cerebrospinal fluid (CSF) and to form partitions with the skull.
Where would a doctor perform a lumbar puncture spinal tap on a patient?
A lumbar puncture (spinal tap) is performed in your lower back, in the lumbar region. During a lumbar puncture, a needle is inserted between two lumbar bones (vertebrae) to remove a sample of cerebrospinal fluid.
Which spinal nerves affect which parts of the body?
The nerves of the cervical spine go to the upper chest and arms. The nerves in your thoracic spine go to your chest and abdomen. The nerves of the lumbar spine then reach to your legs, bowel, and bladder. These nerves coordinate and control all the body’s organs and parts, and let you control your muscles.
Where is cauda equina located?
Overview. The spinal cord ends in the lumbar area and continues through the vertebral canal as spinal nerves. Because of its resemblance to a horse’s tail, the collection of these nerves at the end of the spinal cord is called the cauda equina.
Does the spinal cord end at the sacrum?
Within the sacrum lies the sacral canal, which is a continuation of the vertebral canal. It terminates as the sacral hiatus. Though the spinal cord ends in the lumbar region (L1-L2), the dura mater extends to S2.
What is the lumbosacral Intumescence?
The process of enlarging or swelling; used to describe the spinal enlargements.
