nerve to obturator internus

Nerve:
Plan of sacral plexus and pudendal plexus. (Nerve to the Obturator internus and Gemellus superior labeled at lower left.)
Nerves of the right lower extremity Posterior view. (Nerve to the Obturator internus labeled at upper left.)
Latinnervus musculi obturatorii interni
subject #213 957
Fromsacral plexus
Dorlands/Elsevier n_05/12566195
The nerve to obturator internus is a nerve that innervates the obturator internus and gemellus superior muscles.

Course

The nerve to obturator internus originates in the sacral plexus. It arises from the ventral divisions of the fifth lumbar and first and second sacral nerves.

It leaves the pelvis through the greater sciatic foramen below the piriformis muscle, and gives off the branch to the gemellus superior, which enters the upper part of the posterior surface of the muscle.

It then crosses the ischial spine, reënters the pelvis through the lesser sciatic foramen, and pierces the pelvic surface of the obturator internus.

See also

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

In human anatomy, the sacral plexus is a nerve plexus emerging from the sacral vertebrae (S1-S4), and which provides nerves for the pelvis and lower limbs.

Composition

The sacral plexus is formed by::
  • the lumbosacral trunk

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Pudendal plexus can refer to:
  • Pudendal plexus (nerves)
  • Pudendal plexus (veins)

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Latin}}} 
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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In human anatomy, the sacral plexus is a nerve plexus emerging from the sacral vertebrae (S1-S4), and which provides nerves for the pelvis and lower limbs.

Composition

The sacral plexus is formed by::
  • the lumbosacral trunk

..... Click the link for more information.
Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
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A nerve is an enclosed, cable-like bundle of axons (the long, slender projection of a neuron). Neurons are sometimes called nerve cells, though this term is technically imprecise since many neurons do not form nerves, and nerves also include the glial cells that
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The obturator internus muscle originates on the medial surface of the obturator membrane, the ischium near the membrane, and the rim of the pubis.

It exits the pelvic cavity through the lesser sciatic foramen.
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The superior gemellus muscle is a muscle of the human body.

The Gemelli are two small muscular fasciculi, accessories to the tendon of the Obturator internus which is received into a groove between them.
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In human anatomy, the sacral plexus is a nerve plexus emerging from the sacral vertebrae (S1-S4), and which provides nerves for the pelvis and lower limbs.

Composition

The sacral plexus is formed by::
  • the lumbosacral trunk

..... Click the link for more information.
The five sacral nerves emerge from the sacrum. Although the vertebral components of the sacrum are fused into a single bone, the sacral vertebrae are still used to number the sacral nerves.
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The piriformis (from Latin piriformis = "pear shaped") is a muscle in the gluteal region of the lower limb.

Origin and insertion

It originates from the anterior (front) part of the sacrum, the part of the spine in the gluteal region, and from the superior
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The superior gemellus muscle is a muscle of the human body.

The Gemelli are two small muscular fasciculi, accessories to the tendon of the Obturator internus which is received into a groove between them.
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ischial spine, more or less elongated in different subjects.

Surfaces


external surface gives attachment to the Gemellus superior
internal surface gives atttachment to the Coccygeus, Levator ani, and the pelvic fascia
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An opening between the pelvis and the posterior thigh, the foramen is formed by the sacrotuberous ligament which runs between the sacrum and the ischial tuberosity and the sacrospinous ligament which runs between the sacrum and the ischial spine.
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The obturator internus muscle originates on the medial surface of the obturator membrane, the ischium near the membrane, and the rim of the pubis.

It exits the pelvic cavity through the lesser sciatic foramen.
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The obturator nerve arises from the ventral divisions of the second, third, and fourth lumbar nerves; the branch from the third is the largest, while that from the second is often very small.
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The nerve to quadratus femoris is a nerve that provides innervation to the quadratus femoris and gemellus inferior muscles.

Course

The nerve to quadratus femoris is a sacral plexus nerve.
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Public domain comprises the body of knowledge and innovation (especially creative works such as writing, art, music, and inventions) in relation to which no person or other legal entity can establish or maintain proprietary interests within a particular legal jurisdiction.
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Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened) is an English-language human anatomy textbook widely regarded as a classic work on the subject.
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A nerve is an enclosed, cable-like bundle of axons (the long, slender projection of a neuron). Neurons are sometimes called nerve cells, though this term is technically imprecise since many neurons do not form nerves, and nerves also include the glial cells that
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In common usage, a human leg is the lower limb of the body, extending from the hip to the ankle, and including the thigh, the knee, and the cnemis.[1] The largest bone in the human body, the femur, is in the leg.
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Torso is an anatomical term for the central part of the many animal bodies (including that of the human) from which extend the neck and limbs. It is sometimes referred to as the trunk. The torso includes the thorax and abdomen.
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lumbosacral plexus, the first lumbar nerve being frequently joined by a branch from the twelfth thoracic. For descriptive purposes this plexus is usually divided into three parts:
  • lumbar plexus
  • sacral plexus
  • pudendal plexus

External links


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The lumbar plexus is a nervous plexus in the lumbar region of the body. It is formed by the loops of communication between the anterior divisions of the first three and the greater part of the fourth lumbar nerves; the first lumbar often receives a branch from the last thoracic
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The Iliohypogastric Nerve is the superior branch of the anterior ramus of spinal nerve L1 (one of the lumbar nerves) after this nerve receives fibers from T12(subcostal nerve). The inferior branch is the ilioinguinal nerve.
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The ilioinguinal nerve, smaller than the iliohypogastric nerve, arises with it from the first lumbar nerve.

It emerges from the lateral border of the psoas major just below the iliohypogastric, and, passing obliquely across the quadratus lumborum and iliacus, perforates the
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In human anatomy, the genitofemoral nerve originates from the upper part of the lumbar plexus of spinal nerves. Its roots are L1 and L2 (lumbar).

It emerges on the anterior surface of the psoas major muscle and divides into two branches:
  • The femoral branch

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The lumboinguinal nerve (femoral or crural branch of genitofemoral) descends on the external iliac artery, sending a few filaments around it, and, passing beneath the inguinal ligament, enters the sheath of the femoral vessels, lying superficial and lateral to the
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The genital branch of the genitofemoral nerve (external spermatic nerve) passes outward on the Psoas major, and pierces the fascia transversalis, or passes through the abdominal inguinal ring; it then descends behind the spermatic cord to the scrotum, supplies the
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The lateral cutaneous nerve of the thigh (also called the lateral femoral cutaneous nerve) is a cutaneous nerve that innervates the skin on the lateral part of the thigh.

Structure

The lateral cutaneous nerve of the thigh is a nerve of the lumbar plexus.
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