Muscle Power: Moving Cilia With Contractions

how do muscles move cilia

The ciliary muscle is an intrinsic muscle of the eye that controls the movements of the lens and pupil. It is formed as a ring of smooth muscle in the eye's middle layer, the uvea (vascular layer). The ciliary muscle receives parasympathetic fibres from the short ciliary nerves that arise from the ciliary ganglion. It also changes the shape of the lens within the eye but not the size of the pupil, which is carried out by the sphincter pupillae muscle and dilator pupillae. In the reproductive tract, smooth muscle contractions help the beating of the cilia in moving the egg cell from the ovary to the uterus.

Characteristics Values
Type of muscle Intrinsic muscle of the eye
Muscle composition Smooth muscle fibres oriented in three different directions: longitudinal, radial and circular
Muscle function Controls accommodation for viewing objects at varying distances
Muscle movement Changes the shape of the lens within the eye
Muscle innervation Parasympathetic nerve fibres of oculomotor nerve (CN III)
Muscle origin Mesenchyme within the choroid
Muscle location Middle layer of the eye (uvea or vascular layer)
Muscle regulation Regulates the flow of aqueous humour into Schlemm's canal
Muscle contraction Contraction loosens zonular fibres, increasing the convexity of the lens

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What You'll Learn

cyvigor

The ciliary muscle is an intrinsic muscle of the eye

The ciliary muscle controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humour into Schlemm's canal. It also changes the shape of the lens within the eye, but not the size of the pupil, which is carried out by the sphincter pupillae muscle and dilator pupillae. Contraction of the ciliary muscle loosens the zonular fibres, increasing the convexity of the lens, which induces accommodation for near vision. It also regulates the pore size of the trabecular meshwork.

The ciliary muscle receives parasympathetic fibres from the short ciliary nerves that arise from the ciliary ganglion. The parasympathetic postganglionic fibres are part of cranial nerve V1 (Nasociliary nerve of the trigeminal). The ciliary muscle functions are mainly instructed by the parasympathetic nerve fibres of the oculomotor nerve (CN III).

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cyvigor

The ciliary muscle controls the movement of the lens and pupil

The ciliary muscle is an intrinsic muscle of the eye. It is formed as a ring of smooth muscle in the eye's middle layer, the uvea (vascular layer). The ciliary muscle occupies the biggest portion of the ciliary body, which lies between the anterior border of the choroid and iris. It is composed of smooth muscle fibres oriented in three different directions; longitudinal, radial and circular.

The ciliary muscle receives parasympathetic fibres from the short ciliary nerves that arise from the ciliary ganglion. The parasympathetic postganglionic fibres are part of cranial nerve V1 (Nasociliary nerve of the trigeminal). Together with the sphincter pupillae, the ciliary muscle functions are mainly instructed by the parasympathetic nerve fibres of the oculomotor nerve (CN III).

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cyvigor

The ciliary muscle is formed as a ring of smooth muscle in the eye's middle layer

The ciliary muscle is an intrinsic muscle of the eye formed as a ring of smooth muscle in the eye's middle layer, the uvea (vascular layer). It is composed of smooth muscle fibres oriented in three different directions: longitudinal, radial and circular. The ciliary muscle is the largest part of the ciliary body, which lies between the anterior border of the choroid and iris.

The ciliary muscle controls accommodation for viewing objects at varying distances. It does this by changing the shape of the lens within the eye, increasing the convexity of the lens, which induces accommodation for near vision. The ciliary muscle also regulates the flow of aqueous humour into Schlemm's canal and the pore size of the trabecular meshwork.

The ciliary muscle receives parasympathetic fibres from the short ciliary nerves that arise from the ciliary ganglion. The parasympathetic postganglionic fibres are part of cranial nerve V1 (Nasociliary nerve of the trigeminal). The ciliary muscle functions are mainly instructed by the parasympathetic nerve fibres of the oculomotor nerve (CN III).

The ciliary muscle, pupillary sphincter muscle and pupillary dilator muscle are sometimes called intrinsic ocular muscles or intraocular muscles.

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cyvigor

The ciliary muscle receives parasympathetic fibres from the short ciliary nerves

The ciliary muscle is an intrinsic muscle of the eye. It is formed as a ring of smooth muscle in the eye's middle layer, the uvea (vascular layer). It controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humour into Schlemm's canal. It also changes the shape of the lens within the eye but not the size of the pupil, which is carried out by the sphincter pupillae muscle and dilator pupillae.

The ciliary muscle is one of three smooth muscles that comprise the intrinsic muscles of the eye group. The other two are the dilatator pupillae and sphincter pupillae muscles. The ciliary muscle occupies the biggest portion of the ciliary body, which lies between the anterior border of the choroid and iris. It is composed of smooth muscle fibres oriented in three different directions; longitudinal, radial and circular.

The ciliary muscle is also found in the ventricles of the brain, where ciliated ependymal cells circulate the cerebrospinal fluid.

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cyvigor

Smooth muscle contractions help the beating of cilia in moving the egg cell from the ovary to the uterus

The ciliary muscle receives parasympathetic fibres from the short ciliary nerves that arise from the ciliary ganglion. The parasympathetic postganglionic fibres are part of cranial nerve V1 (Nasociliary nerve of the trigeminal). Contraction of the ciliary muscle loosens the zonular fibres, increasing the convexity of the lens, which induces accommodation for near vision. It also regulates the pore size of the trabecular meshwork.

In the reproductive tract, smooth muscle contractions help the beating of the cilia in moving the egg cell from the ovary to the uterus.

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Frequently asked questions

The ciliary muscle is an intrinsic muscle of the eye, formed as a ring of smooth muscle in the eye's middle layer, the uvea (vascular layer).

The ciliary muscle receives parasympathetic fibres from the short ciliary nerves that arise from the ciliary ganglion. Contraction of the ciliary muscle loosens the zonular fibres, increasing the convexity of the lens, which induces accommodation for near vision.

The ciliary muscle controls accommodation for viewing objects at varying distances, regulates the flow of aqueous humour into Schlemm's canal, and changes the shape of the lens within the eye.

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