Share
VIDEOS 1 TO 50
Oculomotor Nerve and Clinical Correlates Part 1
Oculomotor Nerve and Clinical Correlates Part 1
Published: 2015/12/30
Channel: Dr. Najeeb Lectures
Cranial nerves, CN III Oculomotor nerve tutorial
Cranial nerves, CN III Oculomotor nerve tutorial
Published: 2017/06/20
Channel: Anatomy Next
Neurology | Oculomotor Nerve | Cranial Nerve III
Neurology | Oculomotor Nerve | Cranial Nerve III
Published: 2017/07/25
Channel: Ninja Nerd Science
Cranial nerves III, IV and VI
Cranial nerves III, IV and VI
Published: 2015/06/19
Channel: The Noted Anatomist
Cranial Nerve III - Anatomy Lecture for Medical Students - USMLE Step 1
Cranial Nerve III - Anatomy Lecture for Medical Students - USMLE Step 1
Published: 2015/12/30
Channel: PETROMed Lectures
OCCULOMOTOR NERVE complete description part 1
OCCULOMOTOR NERVE complete description part 1
Published: 2018/01/14
Channel: selfless medicose
Cranial Nerves - Eye Movements and Eye Muscles - MEDZCOOL
Cranial Nerves - Eye Movements and Eye Muscles - MEDZCOOL
Published: 2015/04/22
Channel: Medzcool
Neuro - Cranial Nerve 3 Palsy
Neuro - Cranial Nerve 3 Palsy
Published: 2009/02/03
Channel: Tim Root
Oculomotor, trochlear and abducens nerves (preview) - Human Anatomy | Kenhub
Oculomotor, trochlear and abducens nerves (preview) - Human Anatomy | Kenhub
Published: 2017/02/10
Channel: Kenhub - Learn Human Anatomy
4-8-3 Oculomotor, abducent, and trochlear nerves (cranial nerves III, IV, VI) in the orbit
4-8-3 Oculomotor, abducent, and trochlear nerves (cranial nerves III, IV, VI) in the orbit
Published: 2016/09/27
Channel: Mahmoud El-Gammal
Neuroanatomy - Cranial Nerve III, The Oculomotor Nerve in 3D
Neuroanatomy - Cranial Nerve III, The Oculomotor Nerve in 3D
Published: 2012/10/19
Channel: Mohamed Fouad
oculomotor nerve.wmv
oculomotor nerve.wmv
Published: 2010/05/23
Channel: Sarthak Mohanty
Occulomotor Nerve Path + Lesions| Cranial nerves MADE EASY
Occulomotor Nerve Path + Lesions| Cranial nerves MADE EASY
Published: 2017/06/17
Channel: BabyStepMED
Cranial Nerve III
Cranial Nerve III
Published: 2016/12/12
Channel: Ayesha H
CN III Palsy
CN III Palsy
Published: 2013/10/14
Channel: Larry Mellick
4-8-2 Oculomotor, abducent, and trochlear nerves (cranial nerves III, IV, VI) in the cranium
4-8-2 Oculomotor, abducent, and trochlear nerves (cranial nerves III, IV, VI) in the cranium
Published: 2016/09/27
Channel: Mahmoud El-Gammal
Oculomotor Nerve & Ciliary Ganglion - Neuroanatomy
Oculomotor Nerve & Ciliary Ganglion - Neuroanatomy
Published: 2018/01/27
Channel: Dr. Najeeb Lectures
Third (3rd) Cranial Nerve Palsy
Third (3rd) Cranial Nerve Palsy
Published: 2014/06/20
Channel: U-M Kellogg Eye Center in Ann Arbor
Oculomotor Nerve and Clinical Correlates Part 2
Oculomotor Nerve and Clinical Correlates Part 2
Published: 2015/12/30
Channel: Dr. Najeeb Lectures
Cranial Nerve 3 - The Oculomotor nerve  |  Understanding CNIII palsy  (Part 1)
Cranial Nerve 3 - The Oculomotor nerve | Understanding CNIII palsy (Part 1)
Published: 2018/01/02
Channel: The Lonely Ligand
Imaging cranial nerve 3 - Oculomotor nerve
Imaging cranial nerve 3 - Oculomotor nerve
Published: 2016/02/21
Channel: Yale Radiology and Biomedical Imaging
Oculomotor Nerve Palsy, III Cranial Nerve palsy- Medical animation
Oculomotor Nerve Palsy, III Cranial Nerve palsy- Medical animation
Published: 2017/06/12
Channel: Medical Animations and Videos
Cranial Nerves (3 of 12): Oculomotor Nerve -- Head and Neck Anatomy 101
Cranial Nerves (3 of 12): Oculomotor Nerve -- Head and Neck Anatomy 101
Published: 2012/05/17
Channel: theanatomyroom
Cranial Nerve Examination: CN 3, 4 & 6 oculomotor trochlear abducent
Cranial Nerve Examination: CN 3, 4 & 6 oculomotor trochlear abducent
Published: 2014/09/08
Channel: Soton Brain Hub
Macleod
Macleod's examination of the optic (II), oculomotor (III), trochlear (IV) and abducens (VI) nerves
Published: 2013/07/05
Channel: iain hennessey
Cranial Nerve III: The Oculomotor Nerve
Cranial Nerve III: The Oculomotor Nerve
Published: 2016/11/07
Channel: Carroll PTA2017
Cranial nerve III damage (Oculomotor nerve damage mnemonic)
Cranial nerve III damage (Oculomotor nerve damage mnemonic)
Published: 2017/04/25
Channel: Medicowesome
Oculomotor Nerve and Clinical Correlates Part 3
Oculomotor Nerve and Clinical Correlates Part 3
Published: 2015/12/30
Channel: Dr. Najeeb Lectures
34 Oculomotor Nerve CN III CLINICAL SKILLS راجوج
34 Oculomotor Nerve CN III CLINICAL SKILLS راجوج
Published: 2017/06/12
Channel: Dr Medicine
3rd Nerve Palsy
3rd Nerve Palsy
Published: 2008/04/29
Channel: sam tapsell
Oculomotor Exam
Oculomotor Exam
Published: 2016/11/18
Channel: TrackerLaser
Cranial Nerve Palsies (ophthalmology lecture)
Cranial Nerve Palsies (ophthalmology lecture)
Published: 2013/02/10
Channel: Tim Root
👁👁👁 3rd Nerve Palsy (Oculomotor Nerve): Clinical findings simplified in 35 seconds... #aroraBites
👁👁👁 3rd Nerve Palsy (Oculomotor Nerve): Clinical findings simplified in 35 seconds... #aroraBites
Published: 2018/07/13
Channel: Aman Arora
Neurology | Cranial Nerves | Overview
Neurology | Cranial Nerves | Overview
Published: 2017/07/31
Channel: Ninja Nerd Science
Cranial Nerve 3 - The Oculomotor nerve  |  Understanding CNIII palsy  (Part 2)
Cranial Nerve 3 - The Oculomotor nerve | Understanding CNIII palsy (Part 2)
Published: 2018/01/07
Channel: The Lonely Ligand
Oculomotor Nerve and Clinical Correlates Part 6
Oculomotor Nerve and Clinical Correlates Part 6
Published: 2015/12/30
Channel: Dr. Najeeb Lectures
Oculomotor nerve
Oculomotor nerve
Published: 2014/10/16
Channel: Audiopedia
126. Oculomotor nerve, trochlear nerve and abducens nerve
126. Oculomotor nerve, trochlear nerve and abducens nerve
Published: 2011/07/08
Channel: Bekkamedisin
Right Chronic Oculomotor Nerve Palsy With Aberrant Regeneration
Right Chronic Oculomotor Nerve Palsy With Aberrant Regeneration
Published: 2017/08/05
Channel: Raed Behbehani
Third nerve palsy
Third nerve palsy
Published: 2015/08/23
Channel: Soton Brain Hub
Oculomotor Nerve and Clinical Correlates Part 4
Oculomotor Nerve and Clinical Correlates Part 4
Published: 2015/12/30
Channel: Dr. Najeeb Lectures
oculomotor nerve palsy  Ophthalmology lecture
oculomotor nerve palsy Ophthalmology lecture
Published: 2016/07/28
Channel: allornonelaw
Third Nerve Palsy/Ptosis (drooping eye) Progress!
Third Nerve Palsy/Ptosis (drooping eye) Progress!
Published: 2017/02/07
Channel: NidiBeats
3rd Nerve / Oculomotor nerve palsy
3rd Nerve / Oculomotor nerve palsy
Published: 2017/05/31
Channel: Anatomy for Medical Students Hussain
CN 3: Oculomotor nerve
CN 3: Oculomotor nerve
Published: 2014/05/03
Channel: Simon R. Downes - Med School Radio
Isolated CN III Palsy
Isolated CN III Palsy
Published: 2012/03/02
Channel: Larry Mellick
Third Nerve Palsy, Pupil Involving
Third Nerve Palsy, Pupil Involving
Published: 2018/02/08
Channel: Moran CORE
4 months post-stroke. Oculomotor nerve damage resolving.
4 months post-stroke. Oculomotor nerve damage resolving.
Published: 2017/05/18
Channel: Raven Hutto
Oculomotor Nerve and Clinical Correlates Part 5
Oculomotor Nerve and Clinical Correlates Part 5
Published: 2015/12/30
Channel: Dr. Najeeb Lectures
Cranial Nerve Examination - OSCE Guide (New Version)
Cranial Nerve Examination - OSCE Guide (New Version)
Published: 2015/09/04
Channel: Geeky Medics
NEXT
GO TO RESULTS [51 .. 100]

WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
  (Redirected from Oculomotor)
Jump to navigation Jump to search
Oculomotor nerve
Gray776.png
Nerves of the orbit. Seen from above.
Brain human normal inferior view with labels en.svg
Inferior view of the human brain, with the cranial nerves labelled.
Details
From oculomotor nucleus, Edinger-Westphal nucleus
To superior branch, inferior branch
Innervates Superior rectus, Inferior rectus, Medial rectus, Inferior oblique, Levator palpebrae, sphincter pupillae (parasympathetics), ciliaris muscle (parasympathetics)
Identifiers
Latin nervus oculomotorius
MeSH D009802
NeuroNames 488
TA A14.2.01.007
FMA 50864
Anatomical terms of neuroanatomy

The oculomotor nerve is the third cranial nerve. It enters the orbit via the superior orbital fissure and innervates muscles that enable most movements of the eye and that raise the eyelid. The nerve also contains fibers that innervate the muscles that enable pupillary constriction and accommodation (ability to focus on near objects as in reading). The oculomotor nerve is derived from the basal plate of the embryonic midbrain. Cranial nerves IV and VI also participate in control of eye movement.[1]

Structure[edit]

The oculomotor nerve originates from the third nerve nucleus at the level of the superior colliculus in the midbrain. The third nerve nucleus is located ventral to the cerebral aqueduct, on the pre-aqueductal grey matter. The fibers from the two third nerve nuclei located laterally on either side of the cerebral aqueduct then pass through the red nucleus. From the red nucleus fibers then pass via the substantia nigra exiting through the interpeduncular fossa.

On emerging from the brainstem, the nerve is invested with a sheath of pia mater, and enclosed in a prolongation from the arachnoid. It passes between the superior cerebellar (below) and posterior cerebral arteries (above), and then pierces the dura mater anterior and lateral to the posterior clinoid process, passing between the free and attached borders of the tentorium cerebelli.

It traverses the cavernous sinus, above the other orbital nerves receiving in its course one or two filaments from the cavernous plexus of the sympathetic nervous system, and a communicating branch from the ophthalmic division of the trigeminal nerve. As the oculomotor nerve enters the orbit it divides into a superior and an inferior branch, which enter the orbit through the superior orbital fissure.[1]

Superior branch[edit]

The superior branch of the oculomotor nerve or the superior division, the smaller, passes medially over the optic nerve. It supplies the superior rectus and levator palpebrae superioris.

Inferior branch[edit]

The inferior branch of the oculomotor nerve or the inferior division, the larger, divides into three branches.

  • One passes beneath the optic nerve to the medial rectus.
  • Another, to the inferior rectus.
  • The third and longest runs forward between the inferior recti and lateralis to the inferior oblique. From the last a short thick branch is given off to the lower part of the ciliary ganglion, and forms its short root.

All these branches enter the muscles on their ocular surfaces, with the exception of the nerve to the inferior oblique, which enters the muscle at its posterior border.

Nuclei[edit]

The oculomotor nerve (CN III) arises from the anterior aspect of mesencephalon (midbrain). There are two nuclei for the oculomotor nerve:

Sympathetic postganglionic fibres also join the nerve from the plexus on the internal carotid artery in the wall of the cavernous sinus and are distributed through the nerve, e.g., to the smooth muscle of superior tarsal (Mueller's) muscle.

Function[edit]

The oculomotor nerve include axons of type GSE, general somatic efferent, which innervate skeletal muscle of the levator palpebrae superioris, superior rectus, medial rectus, inferior rectus, and inferior oblique muscles.(innervates all the extrinsic muscles except superior oblique and lateral rectus.)

The nerve also includes axons of type GVE, general visceral efferent, which provide preganglionic parasympathetics to the ciliary ganglion. From the ciliary ganglion post ganglionic fibers pass through the short ciliary nerve to the constrictor pupillae of the iris and the cilliary muscles.

Clinical significance[edit]

Disease[edit]

Paralysis of the oculomotor nerve, i.e., oculomotor nerve palsy, can arise due to:

In people with diabetes and older than 50 years of age, an oculomotor nerve palsy, in the classical sense, occurs with sparing (or preservation) of the pupillary reflex. This is thought to arise due the anatomical arrangement of the nerve fibers in the oculomotor nerve; fibers controlling the pupillary function are superficial and spared from ischemic injuries typical of diabetes. On the converse, an aneurysm which leads to compression of the oculomotor nerve affects the superficial fibers and manifests as a third nerve palsy with loss of the pupillary reflex (in fact, this third nerve finding is considered to represent an aneurysm—until proven otherwise—and should be investigated).[2]

Examination[edit]

Eye muscles[edit]

Cranial nerves III, IV, and VI are usually tested together as part of the cranial nerve examination. The examiner typically instructs the patient to hold his head still and follow only with the eyes a finger or penlight that circumscribes a large "H" in front of the patient. By observing the eye movement and eyelids, the examiner is able to obtain more information about the extraocular muscles, the levator palpebrae superioris muscle, and cranial nerves III, IV, and VI. Loss of function of any of the eye muscles results in ophthalmoparesis.

Since the oculomotor nerve controls most of the eye muscles, it may be easier to detect damage to it. Damage to this nerve, termed oculomotor nerve palsy, is known by its down and out symptoms, because of the position of the affected eye (lateral, downward deviation of gaze).

Pupillary reflex[edit]

The oculomotor nerve also controls the constriction of the pupils and thickening of the lens of the eye. This can be tested in two main ways. By moving a finger toward a person's face to induce accommodation, their pupils should constrict.

Shining a light into one eye should result in equal constriction of the other eye. The neurons in the optic nerve decussate in the optic chiasm with some crossing to the contralateral optic nerve tract. This is the basis of the "swinging-flashlight test".

Loss of accommodation and continued pupillary dilation can indicate the presence of a lesion on the oculumotor nerve.

Additional images[edit]

See also[edit]

References[edit]

This article incorporates text in the public domain from page 884 of the 20th edition of Gray's Anatomy (1918)

  1. ^ a b Vilensky, Joel; Robertson, Wendy; Suarez-Quian, Carlos (2015). The Clinical Anatomy of the Cranial Nerves: The Nerves of "On Olympus Towering Top". Ames, Iowa: Wiley-Blackwell. ISBN 978-1-118-49201-7. [page needed]
  2. ^ Oculomotor Nerve Palsy at eMedicine

External links[edit]

Disclaimer

None of the audio/visual content is hosted on this site. All media is embedded from other sites such as GoogleVideo, Wikipedia, YouTube etc. Therefore, this site has no control over the copyright issues of the streaming media.

All issues concerning copyright violations should be aimed at the sites hosting the material. This site does not host any of the streaming media and the owner has not uploaded any of the material to the video hosting servers. Anyone can find the same content on Google Video or YouTube by themselves.

The owner of this site cannot know which documentaries are in public domain, which has been uploaded to e.g. YouTube by the owner and which has been uploaded without permission. The copyright owner must contact the source if he wants his material off the Internet completely.

Powered by YouTube
Wikipedia content is licensed under the GFDL and (CC) license