Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

HEAD AND NECK > Orbit And Its Contents > Flashcards

Orbit And Its Contents Flashcards

(64 cards)

Start Studying
1
Q

The bones of the orbit is a _______ shaped cavity

A

pyramidal shaped

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

The bones of the orbit has the following BOUNDARIES:

A 
An Apex, 
a Base 
and 
4 Margins + 
4 walls (Orbital Roof, Medial and Lateral Orbital Wall, Orbital Floor)

NB:
Apex = optic canal
Base = orbital margins
Has 4 margins + 4 walls

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

The Apex of the bones of the orbit is formed by the?

A

OPTIC CANAL

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

The Base of the bones of the orbit is formed by the?

A

ORBITAL MARGINS

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

The Margin of the bones of the orbit include:

  1. Superior:
    Mnemonic: Superior - F
  2. Inferior:
    Mnemonic: Inferior - ZM
  3. Medial:
    Mnemonic: Medial - FM
  4. Lateral:
    Mnemonic: Lateral - ZF
A
  1. Superior – frontal bone
  2. Inferior – zygomatic and maxillary bones
  3. Medial – frontal and maxillary bones
  4. Lateral – zygomatic and frontal bones
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

ORBITAL ROOF IS FORMED BY:

A
  1. Orbital plate of the frontal bone
    +
    The lesser wing of the sphenoid bone (posterior part)
  2. Lacrimal gland
  3. Fovea trochlearis
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

The two bones that form the orbital roof are?

A
  1. Orbital plate of the frontal bone
    +
  2. The lesser wing of the sphenoid bone (posterior part)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Medial Orbital Wall IS FORMED BY :

NB: it is 5cm long

A
  1. Is formed from four bones:
    ( Frontal process of the maxillary bone, Lacrimal bone, Orbital plate of the ethmoidal bone, Body of the sphenoid)
  2. Lacrimal Fossa
  3. Anterior and posterior ethmoidal foramina
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The four bones that forms the Medial Orbit wall include:

A
  1. Frontal process of the maxillary bone.
  2. Lacrimal bone.
  3. Orbital plate of the ethmoidal bone.
  4. Body of the sphenoid
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The four bones that forms the Medial Orbiat wall include:

  1. Frontal process of the ________ bone.
  2. La____al bone.
  3. Orbital plate of the eth___al bone.
  4. Body of the sp____id
A
  1. maxillary Bone
  2. . Lacrimal Bone
  3. ethmoidal Bone
  4. sphenoid Bone
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The two bones that form the orbital roof are?

  1. Orbital plate of the fr__al bone
    +
  2. The lesser wing of the sphe___d bone (posterior part)
A
  1. frontal bone

2. sphenoid bone

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

Anterior and posterior ethmoidal foramina
1. Anterior ethmoidal = __mm behind __________ crest
Posterior = ___ mm behind the ante. Ethmoidal foramen

A
  1. 24 mm, anterior lacrimal

2. 12mm, anteerior Ethmoidal

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

The Orbital Floor is formed by:

A
  1. The floor of the orbit is formed from three bones:
    (Maxillary, Palatine ,Orbital plate of the zygomatic bone)
  2. Infraorbital groove
  3. Inferior oblique muscle
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

The floor of the orbit is formed from three bones:

A
  1. Maxillary
  2. Palatine
  3. Orbital plate of the zygomatic
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The floor of the orbit is formed from three bones:

  1. Ma___ary
  2. Pal__ne
  3. Orbital plate of the zy___matic
A
  1. Maxillary
  2. Palatine
  3. Orbital plate of the zygomatic
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Lateral Orbital Wall IS FORMED BY :

NB: It is the Thickest and strongest
5cm; perpendicular to each other

A
  1. Formed from two bones:
    Zygomatic
    Greater wing of the sphenoid
  2. Lateral orbital tubercle (Whitnall’s tubercle)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Lateral Orbital Wall IS FORMED BY 2 Bones :

  1. Zy___atic Bone
  2. Greater wing of the sphe__d Bone
A
  1. Zygomatic Bone

2. Greater wing of the sphenoid

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

Lateral Orbital Wall IS FORMED BY 2 Bones :

A
  1. Zygomatic Bone

2. Greater wing of the sphenoid

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

The Orbital Foramina Include:

A
  1. The optic foramen (Optic Nerve)
  2. The supraorbital foramen, or notch (Supra-orbital nerve
    and blood vessels)
  3. The Anterior and Posterior ethmoidal foramen (Anterior and Posterior Ethmoidal Nerves)
  4. The zygomatic foramen ( ZygomaticoFacial and temporal)
  5. Nasolacrimal canal (Nasolacrimal duct)
  6. Infra-orbital canal
7. Superior orbital fissure  (Lacrimal nerve- Ophtalmic nerve branch, 
Frontal nerve - Ophtalmic nerve branch, 
Nasociliary nerve - Ophtalmic nerve branch, 
Trochlear nerve ,
Oculomotor nerve,
Abducent nerve,
Superior ophthalmic
vein)
8. Inferior Orbital fissure
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

The Orbital Foramina Include:

  1. The _____ foramen (Optic Nerve)
  2. The _________ foramen, or notch (Supra-orbital nerve
    and blood vessels)
  3. The Anterior and Posterior ________ foramen (Anterior and Posterior Ethmoidal Nerves)
  4. The _________ foramen ( ZygomaticoFacial and temporal)
  5. _________ canal (Nasolacrimal duct)
  6. -__________ canal
7. Superior \_\_\_\_\_\_\_\_ fissure (Lacrimal nerve- Ophtalmic nerve branch, 
Frontal nerve - Ophtalmic nerve branch, 
Nasociliary nerve - Ophtalmic nerve branch, 
Trochlear nerve ,
Oculomotor nerve,
Abducent nerve,
Superior ophthalmic
vein)
  1. Inferior _______ fissure
A
  1. optic
  2. supraorbital
  3. ethmoidal
  4. zygomatic
  5. Nasolacrimal
  6. Infra-orbital
  7. orbital
  8. orbital
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Vessels of the orbit are:

1.

3.

A
  1. Ophthalmic artery,
  2. Superior & inferior ophthalmic veins
  3. lymphatics
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Vessels of the orbit are:

  1. Op___almic artery,
  2. Superior & inferior Op___almic veins
  3. l____atics
A
  1. Ophthalmic
  2. ophthalmic

3 lymphatics

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

Ophthalmic artery branches include:

6.

A
  1. central artery of the retina
  2. Muscular branch
  3. ciliary arteries
  4. supra-trochlear arteries
  5. supra-orbital arteries
  6. lacrimal arteries
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Ophthalmic artery branches include:

  1. c___al artery of the retina
  2. M____ar branch
  3. cil__y arteries
  4. supra-tr___ear arteries
  5. supra-o___l arteries
  6. l____al arteries
A
  1. central
  2. Muscular
  3. ciliary
  4. trochlear
  5. orbital
  6. lacrimal
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Nerves that supply the orbit: 1. 2. 3. 4.
1. Optic CN II 2. Oculomotor CN III 3. Trochlear CN IV 4. Branches of Ophthalmic nerves CN V1 = Lacrimal + Frontal + Nasociliary
26
Nerves that supply the orbit: 1. o___c CN II 2. O___motor CN III 3. T___lear CN IV 4. Branches of O___lmic nerves CN V1 = Lacrimal + Frontal + Nasociliary
1. Optic 2. Oculomotor 3. Trochlear 4. Ophthalmic
27
Muscles of the orbits include: 1. 2.
1. Extra Ocular muscles (Superior and Inferior oblique, Superior, Inferior, Medial and Lateral Rectus muscle) 2. Levator Plapebral Superoris
28
Muscles of the orbits include: 1. Extra _______ muscles (Superior and Inferior oblique, Superior, Inferior, Medial and Lateral Rectus muscle) 2. Levator_______ Superoris
1. Ocular | 2. Plapebral
29
The Extra ocular muscles involve the four recti and two oblique muscles: 1. 2. NB: NERVE SUPLPY IS: AO3 LR6 SO4 AO = All other extraocular muscles: innervated by the third nerve (Oculomotor Nerve) LR = Lateral rectus: innervated by the sixth nerve (Abducens Nerve) SO = Superior oblique: innervated by the fourth nerve (Trochlear Nerve)
1. Superior and Inferior oblique 2. Superior, Inferior, Medial and Lateral Rectus muscle NERVE SUPLPY IS: AO3 LR6 SO4 AO = All other extraocular muscles: innervated by the third nerve (Oculomotor Nerve) LR = Lateral rectus: innervated by the sixth nerve (Abducens Nerve) SO = Superior oblique: innervated by the fourth nerve (Trochlear Nerve)
30
Levator Palpebrae ORIGIN: INSERT: ACTION:
ORIGIN: Lesser wing of Sphenoid INSERT: Skin of eyelid and Superior tasal plates ACTION: Elevate the eyelid
31
Levator Palpebrae ORIGIN: Lesser wing of sp__id INSERT: Skin of eyelid and Superior t___al plates ACTION: Elevate the e___d
Sphenoid tarsal eyelid
32
Superior Rectus ORIGIN: INSERT: ACTION: NB: Superior, Inferior, Medial, Lateral Rectus all have a common Origin and Insertion
ORIGIN: Common tendinous ring INSERT: Sclera anterior to the coronal equator ACTION: Elevation, Medial Deviation & Medial rotation NB: Superior, Inferior, Medial, Lateral Rectus all have a common Origin and Insertion
33
Inferior Rectus ORIGIN: INSERT: ACTION: NB: Superior, Inferior, Medial, Lateral Rectus all have a common Origin and Insertion
ORIGIN: Common tendinous ring INSERT: Sclera anterior to the coronal equator ACTION: Elevation, Medial Deviation & Lateral rotation NB: Superior, Inferior, Medial, Lateral Rectus all have a common Origin and Insertion
34
Medial Rectus ORIGIN: INSERT: ACTION: NB: Superior, Inferior, Medial, Lateral Rectus all have a common Origin and Insertion
ORIGIN: Common tendinous ring INSERT: Sclera anterior to the coronal equator ACTION: Medial Deviation NB: Superior, Inferior, Medial, Lateral Rectus all have a common Origin and Insertion
35
Lateral Rectus ORIGIN: INSERT: ACTION: NB: Superior, Inferior, Medial, Lateral Rectus all have a common Origin and Insertion
ORIGIN: Common tendinous ring INSERT: Sclera anterior to the coronal equator ACTION: Lateral Deviation NB: Superior, Inferior, Medial, Lateral Rectus all have a common Origin and Insertion
36
Superior Oblique ORIGIN: INSERT: ACTION:
ORIGIN: Body of sphenoid INSERT: Sclera, postero-superior lateral quadrant ACTION: Depression, lateral Deviation & Medial rotation
37
Inferior Oblique ORIGIN: INSERT: ACTION:
ORIGIN: Maxilla (orbital plate) INSERT: Sclera, postero-inferiorlateral quadrant ACTION: Elevation, Lateral Deviation & lateral rotation
38
_______________ is Responsible for the production and drainage of excess tears
Lacrimal Apparatus
39
Lacrimal Apparatus is responsible for?
production and drainage of excess tears
40
The lacrimal Apparatus consists of: 1. 2. 3. 4.
1. Glands 2. Lacrimal canaliculi 3. Lacrimal Sac 4. Naso-Lacrimal Gland
41
The lacrimal Apparatus consists of: 1. Gl_nds 2. Lac__mal ca__culi 3. Lac__mal Sac 4. N__o-Lacrimal Gland
1. Glands 2. Lacrimal canaliculi 3. Lacrimal Sac 4. Naso-Lacrimal Gland
42
__________ = drains tears from lacus lacimalis into the sac
Lacrimal canaliculi
43
________________ = Medial Wall of the orbit (between lacrimal crests)
Lacrimal Sac
44
_______________ = 2 cm long; drains into inferior meatus of nasal cavity
Naso-lacrimal Gland
45
________ = roof of the orbit
Gland
46
The eyeball is made up of three coats: 1. Fib__s coat, 2. Va__ular pigmented coat 3. Ne__us coat. (Outwards to Inwards)
1. Fibrous coat, 2. Vascular pigmented coat\ 3. Nervous coat.
47
The fibrous coat of the eyeball: 1. . The _____ – poste. 3/4 2. . The _____ - anterior ¼
1. Sclera | 2. Cornea
48
____________ is the area of the sclera that is pierced by the nerve fibres of the optic nerve
lamina cribrosa
49
Blood Supply of the cornea: it’s avascular and devoid of _______ drainage.
lymphatic
50
____________ is in contact posteriorly with the aqueous humor.
Cornea
51
Nerve Supply of the cornea is the: ______ ciliary nerves from the ophthalmic division of the trigeminal nerve
Long ciliary nerves from the ophthalmic division of the trigeminal nerve
52
The vascular coat of the eyeball: 1. The Ch__oid 2. The Ci__ary 3. The Ir_s
1. The Choroid 2. The Ciliary 3. The Iris
53
The ciliary body is composed of the ciliary _____, _______ and _______
ciliary ring, processes, and muscle.
54
The ciliary ring is the posterior part of the body, and its surface has shallow grooves, the _____________
ciliary striae
55
The muscle fibers of the iris: 1. sp__ter pupillae 2. Dil__or pupillae
1. sphincter pupillae | 2. Dilator pupillae
56
The sphincter pupillae is supplied by p_____hetic fibers from the ___________ nerve
parasympathetic, oculomotor
57
The dilator pupillae is supplied by sym____thetic fibers, which pass forward to the eyeball in the long _____ nerves
sympathetic, ciliary
58
The nervous coat of the eyeball: 1. R_na
Retina
59
__________ - an oval, yellowish area, the area for the most distinct vision.
Macula lutea
60
Macula lutea has a central depression called ___________
fovea centralis
61
The optic disc: About _ mm to the above slightly depressed at its center, where it is pierced by the ______ artery of the retina.
3 mm, central
62
The ____________________ is a clear fluid that fills the anterior and posterior chambers of the eyeball A secretion from the ______, processes
aqueous humor, ciliary
63
THE CONTENTS OF THE ORBIT INCLUDE: 1. E___ll 2. F___a 3. M__les: Extra-ocular muscles + Levator palpebral superoris 4. V__els: Ophthalmic artery, Superior & inferior ophthalmic veins & lymphatics 5. N__es: Optic CN II, Oculomotor CNIII, Trochlear CN IV, Branches of Ophthalmic nerves CNV1= Lacrimal + Frontal + Nasociliary 6. L___al gland + Apparatus 7. F_t
1. Eyeball 2. Fascia 3. Muscles 4. Vessels 5. Nerves 6. Lacrimal 7. fat
64
THE CONTENTS OF THE ORBIT INCLUDE:
1. Eyeball 2. Fascia 3. Muscles: Extra-ocular muscles + Levator palpebral superoris 4. Vessels: Ophthalmic artery, Superior & inferior ophthalmic veins & lymphatics 5. Nerves: Optic CN II, Oculomotor CNIII, Trochlear CN IV, Branches of Ophthalmic nerves CNV1= Lacrimal + Frontal + Nasociliary 6. Lacrimal gland + Apparatus 7. Fat

HEAD AND NECK (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions