The sacral spinal nerve 4 (S4) is a spinal nerve of the sacral segment. [1] It originates from the spinal column from below the 4th body of the sacrum. Sacrum, showing bodies in center. S4 supplies many muscles, either directly or through nerves originating from S4.

2023年7月8日 · The spinal nerves S1 – S4 form the basis of the sacral plexus. At each vertebral level, paired spinal nerves leave the spinal cord via the intervertebral foramina of the vertebral column. Each nerve then divides into anterior and posterior nerve fibres. The sacral plexus begins as the anterior fibres of the spinal nerves S1, S2, S3, and S4.

In human anatomy, the sacral plexus is a nerve plexus which provides motor and sensory nerves for the posterior thigh, most of the lower leg and foot, and part of the pelvis. It is part of the lumbosacral plexus and emerges from the lumbar vertebrae and sacral vertebrae (L4-S4). [1]

2023年10月30日 · The sacral plexus is a network of nerves formed by the lumbosacral trunk (L4, L5) and sacral spinal nerves (S1 - S4). The sacral plexus is located on the posterior pelvic wall, posterior to the internal iliac vessels and ureter, and anterior to the piriformis muscle.

Damaging either the S1, S2, S3, S4, or S5 vertebrae should leave the patient fairly functional with some issues controlling bowel and bladder function. Patients with injuries to the sacrum typically live very normal lives. Some assistance may be needed for …

2015年1月1日 · The lumbosacral trunk (L4, L5) runs across the ala of the sacrum to join the first sacral nerve (S1) and, together with the second and third sacral nerves (S2, S3), forms the sciatic nerve. The upper three sacral nerves lie in the sacral hollow where they are cushioned from bone by the piriformis and covered by parietal pelvic fascia.

The sacral plexus refers to the network of nerves formed by the convergence of the LST, S1-S3 ventral rami, and a minor branch from S4. It includes the upper sacral neural band that forms the sciatic nerve and the lower sacral neural band that forms the pudendal nerve. You might find these chapters and articles relevant to this topic.

The sacral plexus provides motor and sensory innervation through the following nerves: Lesions of the sacral plexus can be caused by pelvic fractures, hip surgery, malignant infiltration, local radiotherapy, and the use of orthopaedic traction tables.

2015年1月1日 · Injury to these nerves causes distress and disability and may lead to permanent motor and/or sensory loss. This chapter studies the anatomy of the nerves of the sacral plexus in detail and will highlight the context, mechanism, frequency and outcome following injury.

2025年1月22日 · The sacral plexus is a network of nerves formed by the union of the ventral rami of the L4, L5, S1, S2, S3, and a part of S4 spinal nerves. It is responsible for supplying nerves to the pelvis, lower limb, and parts of the genital and urinary systems. The sacral plexus gives rise to