Ciliary muscle
From Psychology Wiki
Community portal · Tasks to do · News · Help
Clinical · Educational · Ind&Org · Other fields · Professional · Transpersonal · World
Assessment |
Biopsychology |
Comparative |
Cognitive |
Developmental |
Language
Personality |
Philosophy |
Research Methods |
Social |
Statistics
Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology
| Ciliary muscle | ||
|---|---|---|
| The choroid and iris. (Ciliary muscle is labeled near top.) | ||
| Latin | musculus ciliaris | |
| Gray's | subject #225 1011 | |
| System | ||
| MeSH | [1] | |
| [[Image:|190px|center|]] | ||
The ciliary muscle is a smooth muscle that affects zonular fibers in the eye (fibers that suspend the lens in position during accommodation), enabling changes in lens shape for light focusing. When the ciliary muscle contracts, it releases the tension on the lens caused by the zonular fibers (fibers that hold or flatten the lens). The release of tension of the zonular fibers causes the lens to become more spherical. Therefore, relaxation of the ciliary muscle causes the zonular fibers to become taught, flattening the lens, increasing long range focus.
Contents |
[edit] Innervation
Contraction of the lens happens when there is parasympathetic activation of the M3 muscarinic receptors on the ciliary muscles (contraction of the ciliary muscles reduces the size of the ciliary body, lessening the tension on the lens and allowing it to assume a more sperical shape for close vision).
Unlike the muscles of the iris (which receives both types of autonomic innervation), the ciliary muscle receives only parasympathetic innervation. totally
[edit] See also
[edit] Additional images
 Sympathetic connections of the ciliary and superior cervical ganglia. |
 The arteries of the choroid and iris. The greater part of the sclera has been removed. |
 Iris, front view. |
[edit] External links
scalp/eyelid: occipitofrontalis (occipitalis, frontalis) - orbicularis oculi - corrugator supercilii - depressor supercilii
extraocular: levator palpebrae superioris - superior tarsal - rectus (superior, inferior, medial, lateral) - oblique (superior, inferior) - intraocular: ciliary - iris dilator - iris sphincter
ear: auriculares - temporoparietalis - stapedius - tensor tympani
nose: procerus - nasalis (dilatator naris) - depressor septi nasi - levator labii superioris alaeque nasi
mouth: levator anguli oris/depressor anguli oris - levator labii superioris/depressor labii inferioris - zygomaticus (major, minor) - mentalis - buccinator - orbicularis oris - risorius
mastication: masseter - temporalis - pterygoid (lateral, medial)
tongue: extrinsic (genioglossus - hyoglossus - chondroglossus - styloglossus) intrinsic (superior longitudinal - inferior longitudinal - transversus - verticalis)
soft palate: levator veli palatini - tensor veli palatini - musculus uvulae - palatoglossus - palatopharyngeus
pharynx: pharyngeal constrictor (inferior, middle, superior) - stylopharyngeus - salpingopharyngeus
larynx: cricothyroid - posterior cricoarytenoid - lateral cricoarytenoid - arytenoid - thyroarytenoid
 | This muscle article is a stub. You can help Wikipedia by expanding it. |
- hu:Musculus ciliaris
| This page uses content from the English-language version of Wikipedia. The original article was at Ciliary muscle. The list of authors can be seen in the page history. As with Psychology Wiki, the text of Wikipedia is available under the GNU Free Documentation License. |
