Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Ocular Motility > Midterm 1: Kinematics 1 > Flashcards

Midterm 1: Kinematics 1 Flashcards

1
Q

Term for monocular eye movement medially

A

Adduction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Term for monocular eye movement laterally

A

Abduction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Term for monocular eye movement up

A

Supraduction, elevation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Term for monocular eye movement down

A

Infraduction, depression

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Term for monocular eye rotation 12:00 position medially

A

Intorsion, Incycloduction, Incyclorotation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Term for monocular eye rotation 12:00 position laterally

A

Extorsion, Excycloduction, Excyclorotation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Term for monocular eye movement anterior, out of orbit

A

Protrusion, proptosis, exophthamlos

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Term for monocular eye movement posterior, into orbit

A

Retraction, Enophthalmos

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Term for binocular eye movement right

A

dextroversion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Term for binocular eye movement left

A

Levoversion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Term for binocular eye movement up

A

Supraversion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Term for binocular eye movement down

A

Infraversion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Term for binocular eye movement up and right

A

dextroelevation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Term for binocular eye movement up and left

A

Levoelevation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Term for binocular eye movement down and right

A

dextrodepression

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Term for binocular eye movement down and left

A

levodepression

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Term for binocular eye movement adduction

A

convergence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Term for binocular eye movement abduction

A

divergence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Term for binocular eye movement extortion

A

excyclovergence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Term for binocular eye movement intortion

A

Incyclovergence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Term for binocular eye movement right rotation

A

dextrocycloversion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Term for binocular eye movement left rotation

A

levocycloversion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

rotation of a single eye

A

duction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

rotation of both eyes

A

version

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Name the 6 extra ocular muscles and what they are innervated by

A 
Medial rectus (MR) - CN 3
Lateral rectus (LR) - CN 3
Superior rectus (SR) - CN 3
Inferior rectus (IR) - CN 3
Superior oblique (SO) - CN 4
Inferior oblique (IO) - CN 6
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Orienting movement’s larger than about ___ degrees are normally achieved by a combination of head and eye movements.

A

20

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

the branch of classical mechanics that describes the motion of points, bodies (objects), and systems of bodies (groups of objects) without consideration of the forces that cause it.

A

kinematics

28
Q

Where the muscle attaches to bony orbit.

A fixed attachment

A

origin

29
Q

What is insertion? example using recti and tendons

A
  • Where the muscle attaches to globe
  • Recti become tendons prior to insertion
  • Tendons penetrate Tenon’s to attach to the sclera
30
Q

Describe the muscle cone of the eye

A

Formed by the recti, origin at annulus of Zinn (tendinous ring in the orbital apex)

31
Q

Describe optic neuritis

A

Inflammation of optic nerve.

  • could have pain on EOM’s
  • If behind the eye, presence of an APD and pain on eye movements may be the only clues
32
Q

The primary position (primary gaze) is the reference position for ocular rotation. Lines of sight are ________. Lines of sight are __________ to the line between their centers of rotation

A

horizontal; perpendicular

33
Q

The _________ position is any movement directly horizontal or vertical from primary gaze.

A

secondary

34
Q

A movement other than directly horizontal or vertical from primary gaze is considered to be _____________.

A

tertiary position

35
Q

What is the field of action?

A

The position of gaze in which a particular EOM is the primary muscle responsible for getting the eye to that position.

-where the EOM is being assessed on the physiology H

36
Q

How many cardinal positions for physiological H?

A

9

37
Q

What movements does the x-axis on Fick’s axes correspond with?

A

horizontal

rotation around x-axis gives elevation/depression

38
Q

What movements does the Y-axis on Fick’s axes correspond with?

A

line of sight

rotation around the y-axis gives intorsion/extorsion

39
Q

What movements does the Z-axis on Fick’s axes correspond with?

A

Vertical

rotation around the z-axis gives abduction/adduction

40
Q

Inferior oblique innervation, origin, insertion, and angle with visual axis

A

Innervation: CN 3

Origin: Maxillary bone inferior to nasolacrimal fossa
Only EOM originating in the anterior orbit

Insertion: Lateral posterior globe, mostly inferior
Below the anterior-posterior horizontal plane

Angle: 51* angle with the visual axis

41
Q

Superior rectus innervation, origin, insertion, and angle with visual axis

A

Innervation: CN 3

Origin: superior annulus of Zinn & dural ON sheath

Insertion: obliquely into lateral antero-superior sclera

Angle: 23* angle with Fick’s Y-axis

-coordinated movement with levator

42
Q

Inferior rectus innervation, origin, insertion, and angle with visual axis

A

Innervation: CN 3

Origin: inferior annulus of Zinn

Insertion: Oblique arc onto lateral antero-inferior sclera
6.7 mm from limbus

Angle: 23* angle with Fick’s Y-axis

43
Q

Medial rectus innervation, origin, insertion

A

Innervation: CN 3

Origin: Upper and lower annulus of Zinn. Dural optic nerve sheath

Insertion: Vertical line spanning horizontal plane of the eye
Antero-medial globe
5.5 mm from limbus

44
Q

Lateral rectus innervation, origin, insertion

A

Innervation: CN 6

Origin: Upper & lower limb of annulus of Zinn
Process of greater sphenoid wing (spina recti lateralis)

Insertion: Parallel to medial rectus
Antero-lateral globe
6.9 mm from limbus

45
Q

Superior oblique innervation, origin, insertion

A

Innervation: CN 4

Anatomical Origin: Lesser sphenoid wing
Functional Origin: Cartilaginous trochlea, superior medial orbital wall. Muscle ends BEFORE trochlea, 2.5mm tendon passes through trochlea

Insertion: Lateral posterior globe, superior

46
Q

What is the tangential point?

A
  • Where the center of the muscle or tendon first touches the globe.
  • Tangent here indicates the direction of pull.
  • Position changes when the muscle contracts or relaxes, and the eye moves.
47
Q

What is arc of contact?

A
  • The arc formed between the tangential point and the center of the insertion on the sclera.
  • Varies in length as the muscle contracts.
48
Q

What is the muscle plane determined by? What does it describe? What does it determine?

A
  • Determined by a tangential point and the center of rotation.
  • Describes direction of pull of the muscle.
  • Determines the axis of rotation.
49
Q

What is field of fixation? What do its limits depend on? Is it larger mono or binocular?

A

Area within which central fixation is possible by moving ONLY the eyes.

Limits depend on: -Configuration of structures around the eye
-Refraction of the globe

50
Q

Practical ____ includes head movements and is much larger

A

Field of fixation

51
Q

Primary action of medial rectus (MR)

A

Primary: Adduction

52
Q

Primary action of superior rectus (SR)

A

Primary: Elevation

53
Q

Primary action of inferior rectus (IR)

A

Primary: Depression

54
Q

Primary action of inferior oblique (IO)

A

Primary: Extorsion

55
Q

Primary, secondary, and tertiary actions of superior oblique (SO)

A

Primary: Intorsion
Secondary: Abduction
Tertiary: Depression

56
Q

Primary action of lateral rectus (LR)

A

Primary: Abduction

57
Q

Suspensory ligament of Lockwood

A

Fascia below both contribute to ligament & connects lid movement with eye movement

58
Q

What is the medial check ligament? Where does it attach? What does it do?

A
  • Fascial expansion from muscle sheath
  • Attaches to medial orbital wall
  • Helps to hold the globe in place
59
Q

What muscle may be visible in some people?

A

Medial rectus on a lateral gaze. Attachment is the shortest distance to the limbus.

60
Q

Where does Whitnall’s tubercle attach?

A

At lateral wall of orbit

61
Q

angle of superior oblique tendon with the line of sight at primary gaze

A

54 degrees

62
Q

Angle of superior oblique tendon with the line of sight at full adduction. What happens at this angle?

A

0 degrees / parallel. The eye depresses and turns downward

63
Q

Angle of superior oblique tendon with the line of sight when abduction. What happens at this angle?

A

36 degrees. Eye has intorsion

64
Q

Transposition surgery for Strabismus

A

taking body of muscle and moving it inferiorly or superiorly

65
Q

Recession surgery for strabismus

A

When they cut the muscle and place it further back on the globe

66
Q

Resection surgery for strabismus

A

Shortening the muscle and then reattaching to its original insertion to the globe

67
Q

True or False:

Practical field of fixation is larger than binocular and monocular field of fixation

A

True

Ocular Motility (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions