The document discusses the extraocular muscles and their nerve supply, actions, and clinical presentations of nerve palsies. It describes the origins, insertions, innervations and primary actions of the 4 recti muscles and 2 oblique muscles. Figure 1 shows ptosis and limitations of eye movements in 3rd nerve palsy. Figures 2 and 3 demonstrate the clinical findings in 4th nerve and 6th nerve palsies, respectively. Ophthalmoplegia is defined as paralysis of the extraocular muscles resulting in double vision.
Each eyelid contains a fibrous plate, called a tarsus, that gives it structure and shape; muscles, which move the eyelids; and meibomian (or tarsal) glands, which secrete lubricating fluids. The lids are covered with skin, lined with mucous membrane, and bordered with a fringe of hairs, the eyelashes.
Each eyelid contains a fibrous plate, called a tarsus, that gives it structure and shape; muscles, which move the eyelids; and meibomian (or tarsal) glands, which secrete lubricating fluids. The lids are covered with skin, lined with mucous membrane, and bordered with a fringe of hairs, the eyelashes.
The lacrimal apparatus is the physiological system containing the orbital structures for tear production and drainage. It consists of: The lacrimal gland, which secretes the tears, and its excretory ducts, which convey the fluid to the surface of the human eye;it is a serous gland located in lacrimal fossa.
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anatomy of optic nerve and its blood supply and clinical corelation
Presentation Layout: optic nerve anatomy
Embryology of optic nerve
Introduction
Parts of optic nerve
Blood supply
Clinical significance
For Further Reading
Wolff’s Anatomy of the eye and orbit by Bron, Tripathi and Tripathi
Anatomy and Physiology of eye by A.K. Khurana 2nd edition
Comprehensive Ophthalmology by A.K. Khurana 5th edition
AAO- Fundamentals & Principles of Ophthalmology : sec 2
Walsh and Hoyt’s Clinical Ophthalmology
Internet
orbit anatomy along with its borders and contents. extra ocular muscles and their attachment , and their actions, along with their innervation. strabismus and squint. damage of occulomotor, trochlear and abducent nerve sign and symptoms of the patient.
The lacrimal apparatus is the physiological system containing the orbital structures for tear production and drainage. It consists of: The lacrimal gland, which secretes the tears, and its excretory ducts, which convey the fluid to the surface of the human eye;it is a serous gland located in lacrimal fossa.
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Dear viewers Check Out my other piece of works at ❤❤❤ https://healthkura.com/eye-ppt/❤❤❤
anatomy of optic nerve and its blood supply and clinical corelation
Presentation Layout: optic nerve anatomy
Embryology of optic nerve
Introduction
Parts of optic nerve
Blood supply
Clinical significance
For Further Reading
Wolff’s Anatomy of the eye and orbit by Bron, Tripathi and Tripathi
Anatomy and Physiology of eye by A.K. Khurana 2nd edition
Comprehensive Ophthalmology by A.K. Khurana 5th edition
AAO- Fundamentals & Principles of Ophthalmology : sec 2
Walsh and Hoyt’s Clinical Ophthalmology
Internet
orbit anatomy along with its borders and contents. extra ocular muscles and their attachment , and their actions, along with their innervation. strabismus and squint. damage of occulomotor, trochlear and abducent nerve sign and symptoms of the patient.
The extraocular muscles are the six muscles that control movement of the eye and one muscle that controls eyelid elevation. The actions of the six muscles responsible for eye movement depend on the position of the eye at the time of muscle contraction.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
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Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
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Extra ocular muscles ppt
1. Figure 1.
Figure 2.
Figure 3.
Figure 4 .
Write down the answers
In the Figures 1-4
1. Which eye is abnormal ?
2. What is the abnormality ?
3. Name the cranial nerve involved.
4. Name the muscles supplied by that cranial
nerve
10. And the RULE is…..(for recti and oblique)
Any muscle inserting
medial to vertical axis – Adduction
lateral to vertical axis - Abduction
superior to AP axis – Intorsion
inferior to AP axis – Extorsion
For muscle inserting in front of equator i.e RECTI
above transverse axis – Elevation
below transverse axis - Depression
11. ORIGIN OF THE 4 RECTI MUSCLE
Common tendinous ring
(Annulus of Zinn)
•Lateral rectus by 2
heads
–Extra head from
adjoining greater
wing of sphenoid
LEFT EYE
12. COURSE OF THE 4 RECTI
Muscular cone
Corresponding
wall of orbit
Rectus muscle length – 40mm
Innervated from intraconal
side of the muscle belly at the
junction of anterior 2/3 and
posterior 1/3 of the muscle
13. INSERTION OF THE 4 RECTI
The line connecting the insertion of the
recti in series is spiral & is known as spiral
line of Tillaux
Pierce
Tenon’scapsule
Sclera in front of the
equator
Medial rectus is susceptible to injury during anterior segment
procedures
14. AXES OF THE RECTI MUSCLE
Medial and lateral recti in same
horizontal plane
Superior and inferior recti in same
oblique plane, 25⁰lateral to optical
axis
In the abducted eye the axes
coincide
15. Action of the RECTI
• Medial & lateral recti lie in the same horizontal plane
Around a vertical axis
Medial rectus - adduction Lateral rectus -
abduction
16. • Superior rectus
Around the transverse axis – rotates the
eyeball upwards – Elevation (PRIMARY
ACTION)
Around the vertical axis - Adduction
Around the anteroposterior axis -
Intortion
• Inferior rectus
Around the transverse axis – rotates the
eyeball downwards – Depression (PRIMARY
ACTION)
Around the vertical axis – Adduction
Around the anteroposterior axis - Extortion
17. Only in the Abducted position of the eyeball the visual axis coincides with
the axis of superior and inferior recti
In abducted eye
Superior rectus – Elevation only
Inferior rectus - Depression only
18. Superior Oblique muscle
Body of sphenoid above and medial
to optic canal
Winds around trochlea at
superomedial part of orbit
(functional origin)
Insertion behind the equator
Postero‐superior quadrant
Only eye muscle innervated on the outer
surface of muscle belly.
Retrobulbar anaesthetic block
19. Origin from orbital surface of
maxilla
Passes backward and laterally
below inferior rectus
Insertion behind equator
parallel to superior oblique
Postero‐superior quadrant
Inferior Oblique Muscle
The oblique muscles always course below the corresponding vertical
rectus muscle
20. Axis of the Oblique Muscles
The obliques lie in
the same oblique
plane 51⁰medial to
optical axis
In the adducted eye
axes coincide with
the optical axis
21. • Superior oblique
Around the anteroposterior axis –
Intorsion(primary action)
Around the vertical axis Abduction
Around the transverse eaxis –
Depression
• Inferior oblique
Extortion(primary action)
Abduction
Elevation
22. Only in the Adducted position of the eyeball the visual axis coincides with the axis of
superior and inferior oblique
In Adducted eye
Superior oblique – Depression only
Inferior oblique – Elevation only
23. Superior division of oculomotor:- levator palpebrae superioris, superior rectus
Inferior division of oculomotor:- medial rectus, inferior oblique, inferior rectus
Trochlear nerve - superior oblique
Abducent nerve - lateral rectus
Nerve Supply of Extraocular Muscles
25. Extraocular Muscles
Allow accurate positioning of visual axis
Determine the spatial relationship
between the two eyes
Responsible for binocular vision
Have the smallest motor unit among
skeletal muscles – ratio of nerve fibre to
muscle fibre is 1:2(whereas 1:25 in
other skeletal muscles)
-Yoke Muscles: a muscle of one eye is
paired with another muscle of the fellow
eye to produce a cardinal gaze
-Example: Right LR & Left MR
while looking towards right side
They develop from ?
Preotic/preoccipital somitomeres
29. Ptosis
Eyeball turned down and out
Ocular movements restricted
Pupil fixed and dilated
Loss of accomodation
OCCULOMOTOR NERVE PALSY
30. ABDUCENS PALSY – Internal squint
The right eye unable to abduct
External squint- Medial rectus paralysis
The right eye unable to adduct
OPTHALMOPLEGIA / EXTRAOCULAR MUSCLE PALSY
Injury to III, IV, VI cranial nerve Muscle paralysis
Unilateral paralysis produces Strabismus /Squint, Diplopia
TROCHLEAR NERVE
PALSY
Eyeball turned upwards
and inwards
31.
32.
33.
34. TROCHLEAR NERVE PALSY
Affected eye rotated up and in.
Attempts to compensate lead to the patient tilting their head to the contralateral side.
45. Third nerve palsy results in an inability to move
the eye normally in all directions. Injury to the
third nerve can occur anywhere along its path,
from where it originates within the brain to
where it innervates the muscles that move the
eyeball. Third nerve palsy prevents the proper
functioning of the medial, superior, and
inferior recti, and inferior oblique muscles. As
a result, the eye cannot move up, down, or in.
When at rest, the eye tends to look down and
to the side, due to an inequality of muscle
functioning. The muscle responsible for
keeping the upper eyelid open (levator
palpebrae superioris) is also affected, resulting
in a drooping upper eyelid (ptosis
48. phthalmoplegia, also called extraocular muscle palsy, paralysis of the
extraocular muscles that control the movements of the eye. Ophthalmoplegia usually involves the third (oculomotor), fourth
(trochlear), or sixth (abducens)cranial nerves. Double vision is the characteristic symptom in all three cases
49.
50.
51.
52.
53.
54. The optical axis of the eye (the line from the
center of the cornea to the fovea) points
straight ahead during straight-ahead gaze, but
the axis of the orbit points about 23 degrees
laterally. The superior and inferior recti
originate from the back of the orbit, and so
their direction of pulling is not parallel to the
optical axis. As a result, although the superior
rectus primarily elevates the eye, it also has
smaller adducting and intorting effects.
(Similarly, although not indicated in the Þgure,
the inferior rectus primarily depresses but also
adducts and extorts a little.)
55. The pulling direction of the obliques is not
aligned with either the optical axis or the
orbital axis, and their actions change with the
direction of gaze. The superior oblique inserts
in the posterior half of the eye and pulls
diagonally forward. A, As a result, during
straight-ahead gaze, although it primarily
intorts the eye, it also pulls the back of the eye
a little bit medially and upward (i.e., abducts
and depresses a little). B, During adduction,
the direction of pull is more nearly in line with
the optical axis, and the same muscle
depresses more and intorts less. C, During
abduction, the direction of pull can wind up
perpendicular to the optical axis, and the
action becomes purely intorsion. (Similarly,
although not indicated in the Þgure, the
inferior oblique primarily extorts when the eye
is abducted, but it also elevates and abducts in
other directions of gaze.)
Editor's Notes
A layer of invol smooth muscle fibres arise from the aponeurosis of LPS andis attached to superior tarsal plate, innervated by sympathetics, denervation- ptosis.
Ocular rotations are for the most part under vol. control, whereas torsional movements cant be vol. initiated
When the visual axis in its primary position, directed to the horizon,
Medial rectus rotates the eye medially – adduction
Lateral rectus rotates the eye laterally – abduction
around a vertical axis.
Medial & lateral recti lie in the same horizontal plane
The eye's major blood supply comes from the ophthalmic artery. The lateral muscular branch of the ophthalmic artery supplies the lateral rectus, superior rectus, and superior oblique muscles. The medial muscular branch supplies the inferior rectus, medial rectus, and inferior oblique muscles.
Medial and lateral muscular branches of the artery give rise to 7 anterior ciliary vessels, which travel with the 4 rectus muscles to provide circulation for the anterior segment of the eye. Each rectus muscle has 2 anterior ciliary vessels, except for the lateral rectus muscle, which has 1 vessel. These vessels pass anteriorly to the episclera and supply the anterior segment of the eye, including the sclera, limbus, and conjunctiva.
The role of eye movts is to bring the image of objects of visual interest onto the fovea of the retina and to hold the image steady in order to achieve the highest level of visual acuity..several types of eye movts are required to ensure that these conditions are met. Moreover the movements of both eyes must be near perfectly matched to achieve the venefits of binocularity
In the setting of an eye movement problem, isolating which muscle or CN is the culprit can be tricky. When trying to isolate a problem, it can help to check movement in the direction in which that muscle is the primary mover. This can be assessed as follows:
Superior oblique: Depresses the eye when looking medially
Inferior oblique: Elevates the eye when looking medially
Superior rectus: Elevates the eye when looking laterally
Inferior rectus: Depresses the eye when looking laterally
Medial rectus: Adduction when pupil moving along horizontal plane
Lateral rectus: Abduction when pupil moving along horizontal plane