motor and sensory needs of the body
The brachial plexus is formed by the spinal nerves C5-T1, while the lumbosacral plexus is formed by the spinal nerves L1-S4. These plexuses are networks of nerves that supply motor and sensory innervation to the upper and lower limbs, respectively.
The major plexuses of the spinal cord are the cervical plexus (C1-C5), brachial plexus (C5-T1), lumbar plexus (L1-L4), and sacral plexus (L4-S4). These plexuses are networks of nerves that supply motor and sensory function to various regions of the body.
Except for T2-T12, all ventral rami branch and join one another lateral to the vertebral column, forming complicated interlacing nerve networks called nerve plexuses. Nerve plexuses occur in the cervical, brachial, lumbar, and sacral regions and primarily serve the limbs (MarieB, 2010 8th ed. pp. 502)
The sacral plexus gives rise to the sciatic nerve. It is formed by the ventral rami of spinal nerves L4-S4 and is the largest nerve in the body.
Spinal nerves exiting the spinal canal between L4 and S4 collectively make up the sacral plexus.
The ventral rami of spinal nerves C1-T1 form the cervical plexus, serving the head, neck, and diaphragm. T12-S4 form the lumbosacral plexus, serving the lower limbs and pelvic region. These plexuses distribute nerve fibers to various muscles and skin areas, allowing for coordinated movement and sensation in these regions.
Spinal nerves exiting the cord from the level of L4 to S4 supply motor and sensory innervation to the lower extremities, including the buttocks, thighs, legs, and feet. They contribute to functions such as walking, standing, and bladder control. Damage to these nerves can lead to symptoms such as weakness, numbness, and pain in the lower body.
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Both the Galaxy S4 and the Galaxy S4 Active have the same sized display (5 inches). However, the S4 Active uses a TFT capacitive touchscreen, while the standard S4 uses a Super AMOLED capacitive touchscreen. In addition, the S4 Active is taller, wider, thicker, and heavier than the standard S4. It is this way however as it is dust and water resistant (IP67 certified).
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