Pubic symphysis

Pubic symphysis: Anatomy & FunctionAnatomy, functions, innervation and blood supply of the pubic symphysis
~ 2 min

Let’s learn about the structure of the pubic symphysis (symphysis pubica).

Pubic symphysis (symphysis pubica)
Pubic symphysis (symphysis pubica)
Pubic symphysis (symphysis pubica)
Pubic symphysis (symphysis pubica)

It is a structure that connects the symphyseal surfaces of the pubic bones facing each other (facies symphysialis).

Symphyseal surfaces of the pubic bones (facies symphysialis)
Symphyseal surfaces of the pubic bones (facies symphysialis)

The pubic symphysis consists of a fibrous-cartilaginous interpubic disc (discus interpubicum) and several ligaments.

Inside the disc there is a fissure-like cavity located in the sagittal plane.

Interpubic disc (discus interpubicus)
Interpubic disc (discus interpubicus)

The ligamentous apparatus of the pubic symphysis includes:

  • The superior pubic ligament (ligamentum pubicum superius), which is located above the symphysis, connects the pubic bones in the transverse direction.

    Superior pubic ligament (lig. pubicum superius)
    Superior pubic ligament (lig. pubicum superius)
  • The inferior or arcuate pubic ligament (ligamentum arcuatum pubis), which adheres to the symphysis from below and fills the apex of the subpubic angle (angulus subpubicus).

    Inferior or arcuate pubic ligament (lig. arcuatum pubis)
    Inferior or arcuate pubic ligament (lig. arcuatum pubis)
    Inferior or arcuate pubic ligament (angulus subpubicus)
    Inferior or arcuate pubic ligament (angulus subpubicus)

    There are virtually no motions taking place in the pubic symphysis, basically it performs a cushioning function when walking or running. It also plays an important role in ensuring the successful passage of the fetus through the birth canal.

    The following vessels and nerves take part in the blood supply and innervation of the joint.

  • Arteries: inferior epigastric artery (a. epigastrica inferior), internal iliac artery (a. iliaca interna)

  • Veins: the blood outflows through the veins with the same name.

  • Nerves: obturator nerve (n. obturatorius)

Dictionary

Pubic symphysis

Pubic symphysis
symphysis pubica
Interpubic disc
discus interpubicus
Superior pubic ligament
ligamentum pubicum superius
Inferior pubic ligament
ligamentum arcuatum pubis
Subpubic angle
angulus subpubicus
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