The abducens nerve is the sixth paired cranial nerve. It has a purely somatic motor function – providing innervation to the lateral rectus muscle. In this article, we shall look at the anatomy of the abducens nerve – its anatomical course, motor functions and clinical relevance. By TeachMeSeries Ltd (2025) Fig 1Schematic of the anatomical course of the abducens nerve. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Anatomical Course The abducens nerve arises from the abducens nucleus in the pons of the brainstem. It exits the brainstem at the junction of the pons and the medulla. It then enters the subarachnoid space and pierces the dura mater to travel in an area known as Dorello’s canal. At the tip of petrous temporal bone, the abducens nerve leaves Dorello’s canal and enters the cavernous sinus (a dural venous sinus). It travels through the cavernous sinus and enters the bony orbit via the superior orbital fissure. Within the bony orbit, the abducens nerve terminates by innervating the lateral rectus muscle. By TeachMeSeries Ltd (2025) Fig 2Ventral (anterior) surface of the pons. By TeachMeSeries Ltd (2025) Fig 3Coronal section demonstrating the contents of the right cavernous sinus. Motor Function The abducens nerve provides innervation to the lateral rectus muscle – one of the extraocular muscles. The lateral rectus originates from the lateral part of the common tendinous ring, and attaches to the anterolateral aspect of the sclera. It acts to abduct the eyeball (i.e. to rotate the gaze away from the midline). By TeachMeSeries Ltd (2025) Fig 4Lateral view of the extraocular muscles. Clinical Relevance Examination of the Abducens Nerve The abducens nerve is examined in conjunction with the oculomotor and trochlear nerves by testing the movements of the eye. The patient is asked to follow a point with their eyes (commonly the tip of a pen) without moving their head. The target is moved in an ‘H-shape’ and the patient is asked to report any blurring of vision or diplopia (double vision). Clinical Relevance Abducens Nerve Palsy Abducens nerve palsy can be caused by any structural pathology which leads to downwards pressure on the brainstem (e.g. space-occupying lesion). This can stretch the nerve from its origin at the junction of the pons and medulla. Other causes include diabetic neuropathy and thrombophlebitis of the cavernous sinus (in these cases, it is rare for the abducens nerve to be affected in isolation). Clinical features of abducens nerve palsy include diplopia, the affected eye resting in adduction (due to unopposed activity of the medial rectus), and inability to abduct the eye. The patient may attempt to compensate by rotating their head to allow the eye to look sideways. By TeachMeSeries Ltd (2025) Fig 4Right abducens nerve palsy, characterised by the resting position of the pupil in adduction. Do you think you’re ready? Take the quiz below Pro Feature - Quiz The Abducens Nerve (CN VI) Question 1 of 3 Submitting... Skip Next Rate question: You scored 0% Skipped: 0/3 1800 More Questions Available Upgrade to TeachMeAnatomy Pro Challenge yourself with over 1800 multiple-choice questions to reinforce learning Learn More Print Article Rate This Article