Iris Nerve Supply

Nerve rings are depressions in the iris stroma and also are referred to as neurovascular cramp rings cramp rings contraction rings or nerve rings. LONG POSTERIOR CILIARY ARTERIES supply Ciliary body and anastomose with each other and with the anterior ciliary arteries to form the major arterial circle of the iris.

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The muscle itself consists of six to eight circles of smooth muscle fibers between of which are found the nerves and blood vessels that supply each fiber.

Iris nerve supply. The pupillary dilator consists of a spokelike arrangement of modified contractile cells called myoepithelial cells. The nerves of the choroid and iris are the long and short ciliary. These muscles dilate and constrict the pupil in response to sympathetic and parasympathetic nerve impulses from the long ciliary nerve and oculomotor nerve III respectively.

The Nerve Supply of the Iris The nerve supply of the iris deserves special attention. There are several nerve pathways and functions to the iris. The iris sphincter muscle pupillary sphincter pupillary constrictor circular muscle of iris circular fibers is a muscle in the part of the eye called the iris.

Anterior chamber and cornea. The iris contains two muscles which are responsible for pupil size. The iris has a rich supply of nerves.

ANTERIOR CILIARY ARTERIES 7 in no- 2 from each MR SR IR 1 from LR are derived from the MUSCULAR BRANCHES to the rectus muscles. These may be inherited or acquired but either shows that the individual has some degree of nerve tension or anxiety. Physiological changes will show up in the iris tissue presenting information from all parts of the body that have a nerve supply.

These cells are stimulated by the sympathetic nervous system. All these muscles are supplied by the third nerve except the superior oblique which is supplied by the fourth and the external rectus which is supplied by the sixth. After reaching the iris they form a plexus.

When stimulated the cells contract widening the pupil and allowing more light to enter the eye. They pierce the sclera around the entrance of the optic nerve run forward in the perichoroidal space and supply the bloodvessels of the choroid. 1 5 Ocular structures supplied by the parasympathetic system are the iris sphincter ciliary muscle lacrimal gland and blood vessels.

The iris dilator muscle is a smooth muscle of the eye running radially in the iris and therefore fit as a dilator. Some of these nerve filaments also go to form a complete network on the surface of the iris immediately underneath the surface endothelium. Parasympathetic fibres in Oculomotor CN III nerve Dilator Pupillae Radial muscle in outer 23 of the iris Nerve supply.

The circular muscle fibres are supplied by the short ciliary nerve branch of the motor oculi or third cranial nerve coming directly from the brain. The third nerve also supplies the levator palpebra. Sympathetic fibres from superior cervical ganglion Light reflex Increased light on retina Optic nerve - CN II Pupil constricts Oculomotor nerve - CN III.

The sphincter pupillae muscle is a 1mm wide ring of smooth muscle fibres centrally located around the pupil. Hence parasympathetic stimulation supplied by the oculomotor nerve will constrict the pupil while sympathetic stimulation originating from the superior cervical ganglion acts to dilate the pupil. Circular muscle in inner 13 of the iris Nerve supply.

Ocular structures supplied by the sympathetic system are the iris dilator ciliary muscle smooth muscle of the lids lacrimal gland and choroidal and conjunctival blood vessels. The iris has radially-arranged dilator pupillae muscles and concentrically-arranged sphincter pupillae muscles. The nerve supply is from the postganglionic fibres in the short ciliary nerves which are derived from the oculomotor 3rd nerve.

Oculomotor nerve palsy CN III The oculomotor nerve supplies all extraocular muscles except the superior oblique CNIV and the lateral rectus CNVI. The blood from the ciliary body is drained by vorticose veins vortex veins. The former being branches of the nasociliary nerve the latter of the ciliary ganglion.

Superioris and indirectly the iris and ciliary muscle of the eyeball through the ciliary ganglion. Third nerve palsy therefore results in the unopposed action of both the lateral rectus and superior oblique muscles which pull the eye inferolaterally. Besides the ciliary body they also supply the iris and the anterior aspect of the choroid.

The iris is controlled by branches of the autonomic nervous system. Nerve supply of the ciliary body Sensory fibres run from the nasociliary branch of the ophthalmic division of the trigeminal nerve as the long ciliary nerve These fibres enter the ciliary body and terminate in iris cornea and ciliary muscle Sensory Nerves 48. Along the margin of the iris they form a network from which nerve filaments are given off to the muscle fibres and other structures of the iris.

Vasomotor nerves regulate the nerve flow. It encircles the pupil of the iris appropriate to its function as a constrictor of the pupil. Nerve-Supply to the Eye.

Sensory and vasomotor nerves come from the cranial nerve entering the iris root from the ciliary body spreading throughout the stroma to end near the iris fibers. It is located in the pupillary zone of stromal layer of the iris attaching to and encircling the pupillary margin of iris. Sympathetic and parasympathetic controlling the iris muscle.

Sphincter pupillae is a circular muscle about 1 millimeter wide. These arteries form the major arterial circle located near the root of the iris.

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