Thus the cervical nerves are numbered by the vertebra below, except spinal nerve C8, which exists below vertebra C7 and above vertebra T1. The thoracic, lumbar, and sacral nerves are then numbered by the vertebra above.
What nerves are in the thoracic plexus?
T1 and T2 (top two thoracic nerves) feed into nerves that go into the top of the chest as well as into the arm and hand. T1 is also part of the Brachial Plexus. T3, T4, and T5 feed into the chest wall and aid in breathing. T6, T7, and T8 can feed into the chest and/or down into the abdomen.
What are the 5 major nerve plexuses?
Nerve plexuses throughout the body tend to be named after the area in which the plexus occurs and the organs, limbs, and tissues it serves. Examples include the cervical, brachial, lumbar, sacral, celiac, and coccygeal plexuses.
What nerve is between C4 and C5?
The C4 and C5 roots give rise to the dorsal scapular nerve that supplies the rhomboids and levator scapulae. C5, as mentioned earlier, along with C3 and C4, contributes to the phrenic nerve that innervates the diaphragm.
How many nerves are in each plexus?
Nerve plexuses are composed of afferent and efferent fibers that arise from the merging of the anterior rami of spinal nerves and blood vessels. There are five spinal nerve plexuses—except in the thoracic region—as well as other forms of autonomic plexuses, many of which are a part of the enteric nervous system.
What are the 31 spinal nerves?
In humans there are 31 pairs: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal. Each pair connects the spinal cord with a specific region of the body. Near the spinal cord each spinal nerve branches into two roots.
Is there a thoracic plexus?
There are five spinal nerve plexuses—except in the thoracic region—as well as other forms of autonomic plexuses, many of which are a part of the enteric nervous system.
Where is T8 and T9?
Where are the T4-T8 Vertebrae Located? The T4 – T8 vertebrae are located between the T3 and T9 vertebrae and help to make up the thoracic vertebrae column. The thoracic vertebrae region slopes inward between the cervical and lumbar vertebrae regions. The T8 vertebrae can be located in the middle of this inward slope.
What are the systemic nerves of the thoracic plexus?
The most significant systemic nerve to come from this plexus is the sciatic nerve, which is a combination of the tibial nerve and the fibular nerve.
How many nerve plexuses are there in the body?
There are two major groups of nerve plexuses in the body—the spinal plexus and the autonomic plexus. There are five distinct plexuses in each of these major groups of nerves. They are named based on the location or function of the plexus.
What is the other plexus from the cervical level?
The other plexus from the cervical level is the brachial plexus. Spinal nerves C4 through T1 reorganize through this plexus to give rise to the nerves of the arms, as the name brachial suggests.
What is the difference between radial and lumbar plexus?
The radial nerve continues through the arm and is paralleled by the ulnar nerve and the median nerve. The lumbar plexus arises from all the lumbar spinal nerves and gives rise to nerves enervating the pelvic region and the anterior leg.
