What is Ciliaris?
Ciliaris muscle, muscle of the ciliary body of the eye, between the sclera (white of the eye) and the fine ligaments that suspend the lens. It is composed of both longitudinal and circular fibres and serves to change the shape of the lens, enabling the eye to focus upon near or distant objects.
What are the functions of the ciliary muscle?
The ciliary body produces the fluid in the eye called aqueous humor. It also contains the ciliary muscle, which changes the shape of the lens when your eyes focus on a near object. This process is called accommodation.
What Innervates the ciliary body?
Innervation. The major innervation is provided by ciliary nerve branches (third cranial nerve-oculomotor), forming a rich parasympathetic plexus. There are also sympathetic fibers originating from the superior cervical ganglion which keep pace with arteries and their branches.
What are meridional fibers?
Description. The meridional fibers (Brücke’s muscle), much the more numerous, arise from the posterior margin of the scleral spur; they run backward, and are attached to the ciliary processes and orbiculus ciliaris. One bundle, according to Waldeyer, is inserted into the sclera (the longitunal fibers).
What is the function of pupil?
The function of the pupil is clearly that of controlling the amount of light entering the eye, and hence the light reflex.
What is the function of optic nerves?
The optic nerve is a bundle of more than 1 million nerve fibers. Also known as the second cranial nerve or cranial nerve II (CNII), it is the second of several pairs of cranial nerves. It transmits sensory information for vision in the form of electrical impulses from the eye to the brain.
What is ciliary epithelium?
The ciliary epithelium of the ciliary processes produces aqueous humor, which is responsible for providing oxygen, nutrients, and metabolic waste removal to the lens and the cornea, which do not have their own blood supply.
Is the ciliary muscle a sphincter?
The innermost region of ciliary muscle, (Müller’s) annular muscle, is formed of circular muscle bundles with a sphincter type of action. These fibers are located near the major circle of the iris.
What is the function of vitreous chamber?
The large space behind the lens (the vitreous chamber) contains a thick, gel-like fluid called vitreous humor or vitreous gel. These two fluids press against the inside of the eyeball and help the eyeball keep its shape.
What is the main function of the lens?
The main optical function of the lens is to transmit light, focusing it on the retina. The cornea contributes about 80% of total refraction, while the lens fine-tunes the focusing of light onto the retina.
What is the function of the ciliaris muscle?
Ciliaris muscle. Ciliaris muscle, muscle of the ciliary body of the eye, between the sclera (white of the eye) and the fine ligaments that suspend the lens. It is composed of both longitudinal and circular fibres and serves to change the shape of the lens, enabling the eye to focus upon near or distant objects.
What is the function of the spleen in the body?
The physical organization of the spleen allows it to filter blood of pathogens and abnormal cells and facilitate … The spleen is the largest secondary lymphoid organ in the body and, as such, hosts a wide range of immunologic functions alongside its roles in hematopoiesis and red blood cell clearance.
What is the function of APCs in the spleen?
APCs specific to the spleen regulate the T and B cell response to these antigenic targets in the blood. This review will focus on cell types, cell organization, and immunologic functions specific to the spleen and how these affect initiation of adaptive immunity to systemic blood-borne antigens.
Where are parasympathetic fibers carried in the ciliary muscle?
Efferent parasympathetic fibers carried by the oculomotor nerve synapse with the ciliary ganglion, which sends postganglionic fibers to the ciliary muscle. The action of ciliary muscle is instructed by the parasympathetic fibers originating from the Edinger-Westphal nucleus in the midbrain.