Anatomy Of Orbital Caviyy

Question 1

Orbit: pyramidal cavity with a

Answer 1

base and an apex, has roof, floor, medial)nasal) and lateral(temporal )walls

Question 2

Orbital margin

Inferiorly;

Answer 2

palatine+maxillary + zygomatic (maxillary process of zygomatic + zygomatic process of maxilla( MALAR
Process)

Question 3

Laterally;

Answer 3

zygomatic bone+ greater wing of sphenoid

Question 4

Medially:

Answer 4

maxillary bone (frontal process of maxilla)+
lacrimal +
orbital plate of ethmoid

Question 5

Superior;

Answer 5

frontal bone+ lesser wing of sphenoid

Question 6

Orbital cavity - Foramena

Answer 6

Roof;

Supraorbital foramen/notch

Question 7

Medial foramen a

Answer 7

• Ant+post ethmoidal foramen

- lactimal groove

Question 8

Floor foramena

Answer 8

Infraorbital groove+fissure

Inferior orbital fissure

Question 9

Lateral wall foramena

Answer 9

Superior orbital fissure

Question 10

Superior orbital fissure

Answer 10

-CN3,4,5,6
-branche of CN5(trigeminal) =ophthalmic branches:
1-lacrimal nerve
2-frontal nerve
3-nasocilliaru nerve
-superior ophthalmic vein

Question 11

Optic canal where what passes

Answer 11

Optic nerve along with ophthalmic artery(branch of IcA)

Question 12

Periorbita (orbital fascia)

Continuous with

Answer 12

periosteum lining

• the interior of the skull (endosteal layer of the dura mater)
• also with periosteum covering the external surface of the skull

Question 13

Deep to the Medial/ lateral angles of the eyes,
the fascia(periorbital fascia) thicken and form

Answer 13

Medial+ lateral palpebral ligament

Bl canthus

Question 14

Bulbar conjunctiva

Answer 14

Thin, moist transparent
membrane covering the
Eye ball

Question 15

Thickening of periotbital fascia

Answer 15

• ligaments (as we mention before)

- tarsal plate/ orbital septum

Question 16

posterior
surface of the eyelids, called
the

Answer 16

palpebra conjunctiva

Question 17

palpebra conjunctiva form recesses called

Answer 17

Superior and inferior fornices

Question 18

palpebra conjunctiva opens in

Answer 18

palpebral fissure

Question 19

Eyelids Covered by—— (out) and lined

by (inside)

Answer 19

skin

palpebral conjunctiva

Question 20

Eyelids Strengthened by——-

• Reinforced by

Answer 20

tarsal plate

orbicularis oculi

Question 21

What’s located in the eyelid also

Answer 21

• Tarsal (Meibomian) glands: oily
Have IgA and other immunoglobulin
lubricating secretion

• Eyelashes with sebaceous glands

Question 22

Lacrimal gland:

Answer 22

orbital and
palpebral part; open in the
superior fornix

-start supero-lateral

Question 23

Lacrimal Apparatus

Answer 23

• Lacrimal punctum
f
sup
• Lacrimal canaliculus
f I Inf
• Lacrimal sac
• Nasolacrimal duct
In the nose :
• Inferior nasal meatus

Question 24

7 Voluntary muscles of the eye

Answer 24

Note

Question 25

The 3 involuntary muscles are :

Answer 25

1. Dilator pupilae 2. Constrictor pupliea 3. Ciliary muscles (involved in light reflex and accommodation) Under ANS control Symp. >> innervated 1 only Parasymp >> 2/3

Question 26

All the 7 muscles are innervated by CN3(occulomotor) EXCEPT

Answer 26

1- SUPERIOR OBLIQUE =CN4 | 2-LATERAL RECTUS=CN6

Question 27

Muller’s muscle: inserts into

Answer 27

the superior tarsal plate (ptosis)

Question 28

Action of superior Oblique Muscles

Answer 28

depression, abduction and intorsion. Note that if the eye is moved in (adduction), the superior oblique is then in a position to Eye Muscles depress the eye

Question 29

Action of inferior oblique muscle

Answer 29

elevation, abduction and extorsion. Note that if the eye is moved in (adduction), the inferior oblique is then in a position to elevate the eye.

Question 30

Action of recti muscles

Answer 30

Medial:addiction Lateral:abduction Superior:elevation, intosion, addiction Inferior:depression, extortion, addiction.

Question 31

Ophthalmic Artery: branches

Answer 31

``` Central artery of retina Supraorbital – Ciliaries arteries forum post – Lacrimal artery AntEthmoidal q a SO Supraorbital scalp NC lambdoid d sutures – Muscular arteries Nasociliary L Lacrimal – 5 other terminal branches: goesa was supraorbital, supratrochlear, dorsal F nasal, anterior and posterior ethmoidal arteries. ```

Question 32

Superior ophthalmic vein anastomoses with the

Answer 32

facial vein.

Question 33

Ophthalmic Veins exits through the

Answer 33

superior orbital fissure and ends in the cavernous | sinus

Question 34

Inferior ophthalmic vein starts as a plexus on the floor of the orbit, communicates with the pterygoid plexus through the inferior jointheand ends either in the superior ophthalmic vein or in the cavernous sinus

Answer 34

T

Question 35

Central vein of the retina | enters the cavernous sinus but also may join one of the

Answer 35

ophthalmic veins.