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The sacral spinal nerve 1 (S1) is a spinal nerve of the sacral segment, originating from the spinal column below the 1st body of the sacrum. S1 supplies many muscles, either directly or through nerves originating from S1. The muscles that are supplied by S1 include the gluteus minimus, gluteus medius, tensor fascia lata, and gluteus maximus. S1 also covers the uppermost section of the buttocks, including the gluteal cleft, the middle and outer sections of the back of the thighs, the calf muscles, the outer side of the ankles, and the fourth and fifth toes.
| Characteristics | Values |
|---|---|
| Definition | Sacral spinal nerve 1 (S1) is a spinal nerve of the sacral segment |
| Origin | Spinal column from below the 1st body of the sacrum |
| Function | Supplies many muscles, either directly or through nerves originating from S1 |
| Innervation | Muscles are not innervated with S1 as a single origin, but partly by S1 and partly by other spinal nerves |
| Muscles | Gluteus minimus, gluteus medius, tensor fascia lata, gluteus maximus |
| Sensory Functions | None |
| Dermatomes | Uppermost section of buttocks (including gluteal cleft), middle and outer sections of the back of thighs and calf muscles, outer side of ankles, and fourth and fifth toes |
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What You'll Learn
- The sacral plexus is a network of nerves that supplies the muscles of the pelvis and lower limb
- S1 supplies many muscles, either directly or through nerves originating from S1
- S1 to S2: The uppermost section of your buttocks, including the gluteal cleft
- S1 innervates the gluteus minimus, gluteus medius, and tensor fasciae latae
- S1 is a spinal nerve of the sacral segment
The sacral plexus is a network of nerves that supplies the muscles of the pelvis and lower limb
The sacral plexus provides motor and sensory nerves for the posterior thigh, most of the lower leg, the entire foot, and part of the pelvis. The anterior branches of the sacral plexus supply the flexor muscles of the lower limb, while the posterior branches supply the extensor and abductor muscles. The sacral plexus also plays a significant role in sensory innervation for various regions of the lower body. For example, the posterior cutaneous nerve of the thigh, which is derived from the sacral plexus, innervates the skin on the posterior surface of the thigh and leg, as well as the skin of the perineum.
The sacral plexus is part of the larger lumbosacral plexus, which is formed by the union of the lumbosacral trunk and the anterior rami of the sacral nerves. The lumbosacral plexus includes nerves that arise from both the lumbar plexus and sacral plexus. The lumbosacral plexus gives off several branches that supply the hip joint, posterior muscles of the thigh, and all the muscles of the leg and foot. For example, the superior gluteal nerve, which arises from L4, L5, and S1, provides motor supply to the muscles of the gluteal region.
Injuries to the sacral plexus can result in a deficit in sensation and/or movement in the lower limb supplied by the affected nerve(s). This can cause neuropathic pain in the distribution of the affected nerve(s), as the nerve loses its capacity to effectively transmit electrical signals to the muscles. In the case of a compression force being released from the nerve, recovery is typically full.
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S1 supplies many muscles, either directly or through nerves originating from S1
The sacral spinal nerve 1 (S1) is a spinal nerve of the sacral segment. It originates from the spinal column, specifically from below the 1st body of the sacrum. S1 supplies many muscles, either directly or through nerves originating from S1. While these muscles are not innervated with S1 as a single origin, they are partly innervated by S1 and partly by other spinal nerves.
The S1 nerve root innervates the medial head of the gastrocnemius, soleus, and abductor hallucis muscles. The medial head of the gastrocnemius muscle is located on the inner side of the calf, while the soleus muscle is located in the lower leg and assists in standing and walking. The abductor hallucis muscle, as the name suggests, is responsible for abducting the big toe.
In addition to the above, S1 also contributes to the innervation of the gluteus maximus muscle, which is the largest muscle in the human body and is responsible for a range of movements, including standing from a squatting position. The sciatic nerve, which is the continuation of the flattened back of the sacral plexus, supplies the muscles of the back of the thigh, as well as those of the leg and foot.
The sacral plexus, of which S1 is a part, provides motor and sensory nerves for the posterior thigh, most of the lower leg, the entire foot, and part of the pelvis. The anterior branches of the sacral plexus supply the flexor muscles of the lower limb, while the posterior branches supply the extensor and abductor muscles.
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S1 to S2: The uppermost section of your buttocks, including the gluteal cleft
I'm sorry, I haven't been able to find any relevant information. Could you clarify what S1 and S2 refer to?
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S1 innervates the gluteus minimus, gluteus medius, and tensor fasciae latae
The sacral spinal nerve 1 (S1) is a spinal nerve of the sacral segment. It originates from the spinal column from below the 1st body of the sacrum. S1 supplies many muscles, either directly or through nerves originating from S1.
The superior gluteal nerve is a nerve that originates from L4-L5-S1 fibres and provides motor innervation to the tensor fascia latae, gluteus medius, and gluteus minimus muscles. These muscles are involved in hip abduction and internal rotation. The superior gluteal nerve is the only nerve to pass through the sciatic notch above the piriformis muscle.
The gluteus medius is a large fan-shaped muscle located in the posterior hip, extending from the ilium to the proximal femur. Together with the gluteus maximus, gluteus minimus, and tensor fasciae latae muscles, it belongs to the muscles of the gluteal region. The gluteus medius muscle acts on the hip joint, producing two movements. Its anterior part internally rotates the thigh, while the contraction of the whole muscle abducts the thigh. Additionally, the gluteus medius muscle stabilizes the pelvis while standing or walking.
The gluteus minimus not only allows for hip abduction but is also integral to the medial rotation of the thigh due to its anterior component. The tensor fasciae latae, on the other hand, provides traction on the iliotibial tract, thereby assisting in hip extension via the gluteus maximus muscle. Together, all three components comprise the abductor mechanism, which stabilizes the pelvis during the single-leg phase of gait while enabling foot clearance during the swing phase.
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S1 is a spinal nerve of the sacral segment
The sacral spinal nerve 1, also known as S1, is a spinal nerve of the sacral segment. It originates from the spinal column, specifically from below the 1st body of the sacrum. S1 is a mixed nerve, meaning it has both sensory and motor functions, and plays a crucial role in transmitting impulses between the spinal cord and the rest of the body.
S1 supplies and innervates various muscles, either directly or through nerves originating from it. These muscles include the gluteus minimus, gluteus medius, tensor fascia lata, and gluteus maximus. The gluteal and common sciatic nerves, which include contributions from S1, are responsible for the motor innervation of the gluteal region and posterior thigh, enabling movement of the hip in all directions, as well as flexion of the knee.
The anterior rami of S1, along with S2, S3, and S4, form the roots of the sacral plexus. This plexus is a network of nerve fibres that supplies the skin and muscles of the pelvis and lower limb. The sacral plexus begins as the anterior fibres of these spinal nerves, which then divide into several cords. These cords combine to form the five major peripheral nerves of the sacral plexus, which descend down the posterior pelvic wall.
The nerves of the sacral plexus have two main destinations. Some nerves leave the pelvis via the greater sciatic foramen, entering the gluteal region of the lower limb and innervating structures there. Other nerves remain in the pelvis, innervating the pelvic muscles, organs, and perineum. The sacral plexus also contributes to the innervation of the skin and muscles of the posterior surface of the thigh and leg, as well as the perineum.
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Frequently asked questions
S1 is a spinal nerve of the sacral segment.
S1 supplies the gluteus minimus, gluteus medius, tensor fascia lata, and gluteus maximus.
S1 is involved in ankle plantarflexion, eversion/knee flexion, and knee flexion.
S1 is located in the lumbar spine, below the 1st body of the sacrum.
The sacral plexus is formed by the anterior rami of the sacral spinal nerves S1-S4 and lumbar spinal nerves L4 and L5.
