Musculus rectus lateralis

Musculus rectus lateralis

Rectus capitis lateralis muscle
Details Origin Upper surface of the transverse process of the atlas Insertion Under surface of the jugular process of the occipital bone Nerve C1, C2 Actions Lateral flexion, stabilise atlanto-occipital joint Identifiers Latin Musculus rectus capitis lateralis TA A04.2.02.003 FMA 46316 Anatomical terms of muscle

The rectus capitis lateralis, a short, flat muscle, arises from the upper surface of the transverse process of the atlas, and is inserted into the under surface of the jugular process of the occipital bone.

Contents

Additional images [ edit ]

Position of rectus capitis lateralis muscle (shown in red). Animation.

Close up. Skull has been removed (except occipital bone).

Lateral view. Still image.

Occipital bone. Outer surface.

Base of skull. Inferior surface.

See also [ edit ]

References [ edit ]

This article incorporates text in the public domain from page 395 of the 20th edition of Gray’s Anatomy (1918)

Наши научные разработки сегодня применяются для восстановления здоровья спортсменов во всех видах спорта. Многолетние исследования в спорте высших достижений, доказали высокую степень эффективности методик, которые помогают спортсменам побеждать и выигрывать, сохраняя при этом самое ценное – здоровье. Сегодня эти оздоровительные методы должны быть доступны всем людям.
Доктор биологических наук, физиолог Анатолий Шевцов
Санкт-Петербург, Каменноостровский пр-т 54/31

Прямая латеральная мышца головы. Musculus rectus capitis lateralis

Латинское название: rectum — прямой; capitis — головы; lateral — боковой.

Место отхождения. Поперечный отросток атланта.

Место прикрепления. Яремный отросток затылочной кости.

Действие. Наклоняет голову вбок. Стабилизирует атлантозатылочный сустав.

Иннервация. Петля между вентральными ветвями шейных нервов С1, 2.

Кровоснабжение. Глубокая шейная артерия реберно-шейного ствола (от подключичной артерии).

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Lateral rectus
Details Origin annulus of Zinn at the orbital apex Insertion 7 mm temporal to the limbus Nerve abducens nerve Actions abducts the eyeball (makes it move outwards) Identifiers Latin musculus rectus lateralis bulbi TA A15.2.07.013 FMA 49038 Anatomical terms of muscle

The lateral rectus muscle is a muscle on the lateral side of the eyeball in the orbit. It is one of six extraocular muscles that control the movements of the eye. The lateral rectus muscle is responsible for lateral movement of the eyeball, specifically abduction. Abduction describes the movement of the eye away from the midline (i.a. nose), allowing the eyeball to move horizontally in the lateral direction, bringing the pupil away from the midline of the body. [1]

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Structure [ edit ]

The lateral rectus originates at the lateral part of the annulus of Zinn, also known as the annular tendon or common tendinous ring, and inserts into the temporal side of the eyeball. The annulus of Zinn is a tendinous ring that surrounds the optic nerve and serves as the origin for five of the six extraocular muscles, excluding the inferior oblique muscle. [2]

Nerve supply [ edit ]

It is the only muscle supplied by the abducens nerve, cranial nerve VI. The abducens nerve exits the brainstem from the pons-medullary junction, and travels through the superior orbital fissure to innervate the lateral rectus muscle. [1]

The lateral rectus muscle is innervated through the tectospinal tract. This tract begins in the tectum region of the midbrain, and crosses to the contralateral side of the midbrain. The tectospinal tract descends through the brainstem to the upper spinal cord, but goes no further than the neck. This tract is involved with both upper and lower motor neurons, as well as in the reflex of turning the head in response to visual and auditory stimulus. Part of the descending tracts carry motor signals down the brainstem and spinal cord. [3]

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Function [ edit ]

It causes outward movement of the eyeball, also called as abduction.

Clinical significance [ edit ]

A sixth nerve palsy, also known as abducens nerve palsy, is a neurological defect that results from a damaged or impaired abducens nerve. This damage can stem from stroke, trauma, tumor, inflammation, and infection. Damage to the abducens nerve by trauma can be caused by any type of trauma that causes elevated intracranial pressure; including hydrocephalus, traumatic brain injury with intracranial bleeding, tumors, and lesions along the nerve at any point between the pons and lateral rectus muscle in orbit. This defect can result in horizontal double vision and reduced lateral movement. The lateral rectus muscle will be denervated and paralyzed and the patient will be unable to abduct the eye. For example, if the left abducens nerve is damaged, the left eye will not abduct fully. While attempting to look straight ahead, the left eye will be deviated medially towards the nose due to the unopposed action of the medial rectus of the eye. [4] Proper function of the lateral rectus is tested clinically by asking the patient to look laterally. Depending on the underlying cause of the lateral rectus palsy, some improvement may occur naturally over time. While the prognosis for a lateral rectus palsy onset by a viral illness is generally positive, the prognosis for an onset of trauma or tumor is quite poor. Ultimately, nerves are not very good at regenerating or healing themselves, so if the damage is severe there will be permanent damage. [5]

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In addition, another disorder associated with the lateral rectus muscle is Duane Syndrome. This syndrome occurs when the sixth cranial nerve which controls the lateral rectus muscle does not develop properly. It is believed that Duane Syndrome is a result of a disturbance of normal embryonic development due to a genetic or an environmental factor. [6]

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