Nerve, accessory

Nerve, accessory
The accessory nerve is the eleventh cranial nerve. All twelve cranial nerves, the accessory nerve included, emerge from or enter the skull (the cranium) as opposed to the spinal nerves which emerge from the vertebral column. The accessory is so-called because, although it arises in the brain, it receives an additional (accessory) root from the upper part of the spinal cord. The accessory nerve supplies the sternocleidomastoid and trapezius muscles. The sternocleidomastoid muscle is in the front of the neck and turns the head. The trapezius muscle moves the scapula (the wingbone), turns the face to the opposite side, and helps pull the head back. Damage to the accessory nerve can be isolated (confined to the accessory nerve) or it may also involve the ninth and tenth cranial nerves which exit through the same opening (foramen) from the skull . Accessory neuropathy (nerve disease) can sometimes occur and recur for unknown reasons. Most patients recover. Paralysis of the accessory nerve prevents rotation of the head away from that side and causes drooping of the shoulder.

Medical dictionary. 2011.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • Accessory nerve — Nerve: Accessory nerve Plan of upper portions of glossopharyngeal, vagus, and accessory nerves …   Wikipedia

  • Accessory — may refer to:*Accessory (legal term), a person who assists a criminal but is not present at the crime *Accessory (band), with members Dirk Steyer and Ivo Lottig *Fashion accessory, i.e. an item used to complement a fashion or style *Video game… …   Wikipedia

  • Nerve injury — Classification and external resources Micrograph of a nerve with a decrease in myelinated nerve fibres (pink) and an abnormal increase in fibrous tissue (yellow), as may be seen in nerve injuries. HPS stain …   Wikipedia

  • Nerve to obturator internus — Nerve: Nerve to obturator internus Plan of sacral plexus and pudendal plexus. (Nerve to the Obturator internus and Gemellus superior labeled at lower left.) …   Wikipedia

  • Nerve to the Piriformis — Nerve: Nerve to the Piriformis Plan of sacral plexus and pudendal plexus. (Label to piriformis is at center left.) …   Wikipedia

  • Nerve to quadratus femoris — Nerve: Nerve to quadratus femoris Plan of sacral plexus and pudendal plexus. Latin nervus musculi quadratus femoris Gray s …   Wikipedia

  • Nerve to the stapedius — Nerve: Nerve to the stapedius Latin nervus stapedius Gray s subject #202 904 Innervates Stapedius From facial nerve The Nerve to the Stapedi …   Wikipedia

  • accessory oculomotor nuclei — accessory nuclei of oculomotor nerve nuclei accessorii nervi oculomotorii …   Medical dictionary

  • obturator nerve accessory — nervus obturatorius accessorius …   Medical dictionary

  • peroneal nerve accessory deep — nervus peroneus profundus accessorius …   Medical dictionary

Share the article and excerpts

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