Extraocular Muscles And Nerve Supply

Originate from three separate foci of primordial cells one for the muscles innervated by the oculomotor nerve one for the superior oblique muscle and one for the lateral rectus muscle. Lateral rectus innervated by the 6 th abducens nerve.

Image Result For Extraocular Muscles Laterally Muscle Ocular Anatomy And Physiology

Four of the extraocular muscles originated from a tendinous band surrounding the optic nerve.

Extraocular muscles and nerve supply. With an oculomotor nerve CN III palsy the two unaffected muscles are the superior oblique and lateral rectus. Six skeletal muscles surround and produce various eye movements. The letters represent the extraocular muscles and numbers represent their respective cranial nerve supply.

The ocular movement occurs around the three axis. All the extraocular muscles that move the eyeball are supplied by the oculomotor nerve CN3 with the exception of lateral rectus and superior oblique that are supplied by the abducent nerve CN6 and trochlear nerve respectively mnemonic. Damage to one of the cranial nerves will cause paralysis of its respective muscles.

Nerves of the Extraocular Muscles The upper division of the oculomotor nerve cranial nerve CN III innervates the superior rectus and the levator palpebrae superioris muscles. Superior oblique innervated by the 4 th trochlear nerve. Extraocular muscles their Nerve supply Nerve supply of Extraocular muscles EXTRAOCULAR MUSCLES.

The extraocular muscles are seven muscles supplied by cranial nerves that are responsible for eye movement in some cases when these nerves are affected consequently they affect eye movements. The orbit hosts the eyeballs extraocular muscles optic nerve lacrimal apparatus fat tissue fascia and vessels that supply these structures. LR6 S04 ie LR lateral rectus by 6 CN and SO superior oblique by 4 CN.

The sensory and motor control of human extraocular muscles EOMs have been subjected to considerable speculation in ophthalmic literature often related to infranuclear structures such as the unique complement of muscle fibres and their associated sensory organs. Orbital and retrobulbar fascia. The muscle acting on the eye ball to produce various movements of eye are called extraocular muscles.

Third nerve palsy therefore results in the unopposed action of both the lateral rectus and superior oblique muscles which pull the eye inferolaterally. Somatomotor innervation of the levator palpebrae superiorus originates in a subnucleus of the somatic portion of the oculomotor nucleus in the midbrain near the dorsal midline. The orbit is composed of 7 bones and has a pyramidal shape with its apex pointed posteromedially.

Innervations or Nerve supply of extra-ocular muscles All these muscles are supplied by oculomotor nerve Cranial Nerve III except lateral rectus by abducent nerve CN VI and superior rectus by trochlear nerve CN IV. Superior rectus inferior rectus medial rectus lateral rectus. Cranial nerves II III IV V and VI.

The oculomotor nerve also carries parasympathetic fibers that supply the intrinsic muscles of the eye and transmits propriosensation from the extraocular muscles. Embryology Mesodermal origin Development begins at 34 weeks gestation. The extraocular muscles are innervated by three cranial nerves.

Hence the subsequent nerve supply innervation of the eye muscles is from three cranial. The walls of the orbit contain several fissures openings and fossae which are important for housing the orbital structures and for neurovascular communication of the orbital content with the central. Understanding the anatomy of the extraocular muscles is useful for understanding cranial nerve palsies.

Oculomotor nerve palsy CN III The oculomotor nerve supplies all extraocular muscles except the superior oblique CNIV and the lateral rectus CNVI. The levator palpebrae superioris is supplied by the oculomotor nerve CN III. The sensory and motor control of human extraocular muscles EOMs have been subjected to considerable speculation in ophthalmic literature often related to infranuclear structures such as the.

The lower division of CN III innervates the inferior rectus medial rectus and inferior oblique muscles. The superior tarsal muscle is by the sympathetic nervous system. There are three centers of growth that are important in the development of the eye and each is associated with a nerve.

Actions of extra-ocular muscles Superior rectus elevates adducts and medially rotates the eyeball. The extraocular muscles develop along with Tenons capsule part of the ligaments and the fatty tissue of the eye socket orbit. Other muscles superior inferior medial recti and inferior oblique innervated by the 3 rd oculomotor.

Palpebral and suspensory ligaments. This will alter the resting gaze of the affected eye. In the event of a palsy the muscles supplied by the affected nerve will not work.

Superior and inferior oblique muscles. Priyanka Bharti ANATOMY AND PHYSIOLOGY OF EXTRAOCULAR MUSCLES 2. The orbital contents comprise the eye.

Lacrimal gland with its sac and nasolacrimal duct.

Education Educational Medical Student Study Medical School Studying Nursing School Notes

Extraocular Muscles Mnemonic Best Medical Mnemonics Medical Mnemonics Anatomy And Physiology Eye Health

Pin By Laura Sweeney On Arteries And Veins Muscle Testing School Help Pa School

Image Result For Extraocular Muscles Nerve Supply Muscle And Nerve Nerve Helping Others

Pin On Picturing Medicine

Pin By Sparkelate On Pa Cranial Nerves Muscle And Nerve Nerve

Pin On Anatomy And Physiology

Ix Cranial Nerve Glossopharyngeal Nerve Functional Component Nucleus Glossopharyngeal Nerve Cranial Nerves Vagus Nerve

Cranial Nerves Motor And Sencory Distribution Schema Nerve Anatomi Manusia Kedokteran

Pin By Zuli On Body Facts And Information Cranial Nerves Nerve Cranial Sacral Therapy

Pin On Anatomy Physiology

Top 10 Strongest Muscles In The Body Pouted Com Human Body Muscles Muscle Body Rectus Muscle

Instant Anatomy Head And Neck Areas Organs Eye Orbit Levator Palpebrae Superioris Eye Anatomy Diagram Eye Anatomy Orbit Anatomy

Extraocular Muscle Actions And Innervation Eye Movement Wikipedia Movement Eyes Neurology

Image Result For Extraocular Muscles Nerve Supply Muscle And Nerve Muscle Medical Imaging

Extraocular Muscle Actions Eye Movements Rectus Muscles Oblique Muscles Rectus Muscle Eye Anatomy Muscle Anatomy

Image Result For Extraocular Muscles Nerve Supply Muscle And Nerve Optic Nerve Nerve

Muscles And Eye Movements Extraocular Eye Health Medicine And Anatomy Reference Pictures Human Anatomy And Physiology Anatomy Eye Anatomy

Image Result For Muscles Of The Eye Muscle Anatomy Anatomy Anatomy Organs

Location:

Share :