What does the oculomotor supply?
The autonomic nervous system supplies (innervates) organs, like your eyes. The oculomotor nerve is the third cranial nerve (CN III). It allows movement of the eye muscles, constriction of the pupil, focusing the eyes and the position of the upper eyelid.
What is the oculomotor response?
The ocular reflexes are the simplest ocular motor responses. Ocular reflexes compensate for the condition of the cornea and for changes in the visual stimulus. For example, the eye blink reflex protects the cornea from drying out and from contact with foreign objects.
What muscle does the oculomotor nerve supply?
The oculomotor nerve innervates the superior, inferior, and medial recti, as well as the inferior oblique and levator palpebrae superioris muscles.
What nerves are responsible for eye movement?
Cranial nerves III (CNIII) (oculomotor), IV (trochlear), and VI (abducens) control the position of the eyeballs; CNIII influences the position of the eyelids and the size of the pupils.
Is the oculomotor nerve sensory or motor?
Somatic Motor
| Nerves in Order | Modality | Function |
|---|---|---|
| Olfactory | Special Sensory | Smell |
| Optic | Special Sensory | Vision |
| Oculomotor | Somatic Motor Visceral Motor | Levator palpebrae, superioris, superior, medial & inferior recti muscles Parasympathetic to ciliary & pupillary constrictor muscles |
| Trochlear | Somatic Motor | Superior oblique muscle |
What is oculomotor nerve?
The oculomotor nerve (the third cranial nerve; CN III) has three main motor functions: Innervation to the pupil and lens (autonomic, parasympathetic) Innervation to the upper eyelid (somatic) Innervation of the eye muscles that allow for visual tracking and gaze fixation (somatic)
Which part of the brain controls visual reflexes and eye movements?
Superior Colliculus The superior colliculi are primarily involved in vision and visual reflexes. They receive input from the retina, the cerebral cortex (primarily from the frontal lobe eye fields—Brodmann’s area 8), various brainstem nuclei, and the spinal cord.
How is eye movement controlled?
For each eye, six muscles work together to control eye position and movement. Two extraocular muscles, the medial rectus and lateral rectus, work together to control horizontal eye movements (Figure 8.1, left). Contraction of the medial rectus pulls the eye towards the nose (adduction or medial movement).
Is accessory sensory or motor?
Table of cranial nerves
| No. | Name | Sensory, motor, or both |
|---|---|---|
| VIII | Vestibulocochlear In older texts: auditory, acoustic. | Mostly sensory |
| IX | Glossopharyngeal | Both sensory and motor |
| X | Vagus | Both sensory and motor |
| XI | Accessory Sometimes: cranial accessory, spinal accessory. | Mainly motor |
What does oculomotor nerve do?
The oculomotor nerve helps to adjust and coordinate eye position during movement. Several movements assist with this process: saccades, smooth pursuit, fixation, accommodation, vestibulo-ocular reflex, and optokinetic reflex.
What controls eye movement in the brain?
The cerebellum plays a pivotal role in the control of eye movements. Its core function is to optimize ocular motor performance so that images of objects of interest are promptly brought to the fovea – where visual acuity is best – and kept quietly there, so the brain has time to analyze and interpret the visual scene.
What are eye movements controlled by?
For each eye, six muscles work together to control eye position and movement. Two extraocular muscles, the medial rectus and lateral rectus, work together to control horizontal eye movements (Figure 8.1, left).
What does the oculomotor nerve do?
The oculomotor nerve helps to adjust and coordinate eye position during movement. Several movements assist with this process: saccades, smooth pursuit, fixation, accommodation, vestibulo-ocular reflex, and optokinetic reflex. Saccades are rapid, jerky motions of the eye.
What part of the brain controls involuntary eye movement?
The brainstem controls movement of the eyes, face, and mouth. It also relays sensory messages (such as hot, pain, and loud) and controls respirations, consciousness, cardiac function, involuntary muscle movements, sneezing, coughing, vomiting, and swallowing.