Sacral plexus

Sacral plexus

Infobox Nerve
Latin = plexus sacralis
GraySubject = 213
GrayPage = 957

Caption = Plan of sacral and pudendal plexuses.

Caption2 = Relations of the sacral plexus. Dissection of side wall of pelvis showing sacral and pudendal plexuses.
Innervates =
BranchFrom = L4-L5, S1-S4
BranchTo =
MeshName =
MeshNumber =
DorlandsPre = p_24
DorlandsSuf = 12648416
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.


The sacral plexus is formed by::
* the lumbosacral trunk
* the anterior division of the first sacral nerve
* portions of the anterior divisions of the second and third sacral nerves

The nerves forming the sacral plexus converge toward the lower part of the greater sciatic foramen, and unite to form a flattened band, from the anterior and posterior surfaces of which several branches arise.

The band itself is continued as the sciatic nerve, which splits on the back of the thigh into the tibial nerve and common fibular nerve; these two nerves sometimes arise separately from the plexus, and in all cases their independence can be shown by dissection.

Often, the sacral plexus and the lumbar plexus are considered to be one large nerve plexus, the lumbosacral plexus. The lumbosacral trunk connects the two plexuses.


The sacral plexus lies on the back of the pelvis (Mr.V) between the piriformis muscle and the pelvic fascia. In front of it are the internal iliac artery, internal iliac vein, the ureter, and the sigmoid colon. The superior gluteal artery and vein run between the lumbosacral trunk and the first sacral nerve, and the inferior gluteal artery and vein between the second and third sacral nerves.

Nerves formed

All the nerves entering the plexus, with the exception of the third sacral, split into ventral and dorsal divisions, and the nerves arising from these are as follows of the table below:


ee also

* Cervical plexus
* Brachial plexus
* Lumbar plexus

External links

* [ Illustration at]
* [ at]

Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • sacral plexus — n a nerve plexus that lies against the posterior and lateral walls of the pelvis, is formed by the union of the lumbosacral trunk and the first, second, and third sacral nerves, and continues into the thigh as the sciatic nerve * * * 1. p.… …   Medical dictionary

  • sacral plexus — noun a nerve plexus formed by the 4th and 5th lumbar and 1st, 2nd, 3rd sacral nerves; supplies the pelvic region and lower limbs • Syn: ↑plexus sacralis • Hypernyms: ↑nerve plexus * * * noun : a nerve plexus supplying the posterior limb and… …   Useful english dictionary

  • sacral plexus — a nerve network originating from the nerves of the sacral spine and innervating large areas of the lower trunk and legs, esp. via the sciatic nerves. * * * …   Universalium

  • sacral plexus neuropathy — sacral plexopathy …   Medical dictionary

  • sacral plexus anterior — p. venosus sacralis …   Medical dictionary

  • plexus sacralis — [TA] sacral plexus: a plexus that lies in front of the piriform muscle, arising from the anterior branches of the last two lumbar nerves (which form the lumbosacral trunk) and the first four sacral nerves. It has twelve named branches, five… …   Medical dictionary

  • Sacral nerves — Infobox Nerve Name = PAGENAME Latin = nervi sacrales GraySubject = 209 GrayPage = 924 Caption = Areas of distribution of the cutaneous branches of the posterior divisions of the spinal nerves. The areas of the medial branches are in black, those… …   Wikipedia

  • plexus lumbalis — 1. [TA] lumbar plexus: a plexus formed by the anterior branches of the second to fifth lumbar nerves in the psoas major muscle (the branches of the first lumbar nerve often are included). The lower division of the fourth lumbar nerve joins the… …   Medical dictionary

  • plexus sacralis — noun a nerve plexus formed by the 4th and 5th lumbar and 1st, 2nd, 3rd sacral nerves; supplies the pelvic region and lower limbs • Syn: ↑sacral plexus • Hypernyms: ↑nerve plexus …   Useful english dictionary

  • Plexus — A plexus is a network. It has more specific meanings in multiple fields.BiologyIn biology it has multiple meanings.Nervous systemIn many animals the processes of neurons join together to form a plexus or nerve net. In vertebratesIn vertebrates, a …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”