200

Front 1

INFERIOR OBLIQUE

OIAI

Back 1

G. Inferior oblique

1. Origin: orbital surface ofthe maxilla, lateral to the fossa for the lacri-
mal sac

2. Insertion: courses laterally and posteriorly, between the inferior rectus
and floor of the orbit, and inserts into the sclera ofthe inferolateral quad-
rant ofthe posterior half of the eye

3. Action: moves the pupil superiorly and laterally

4. Innervation: inferior branch ofthe oculomotor nerve

Front 2

FASCIAE: PERIORBITA

Back 2

H. Fasciae

1. Periorbita: periosteum covering the walls ofthe orbit: it is continuous
at the orbital margin with the orbital septum and pericranium

Front 3

FASCIAE: INTERMUSCULAR MEMBRANE

Back 3

H. Fasciae

2. Intermuscular membrane: composed of four fascial sheets interposed be-
tween, and continuous with, the fascial sheaths ofthe tour rccti muscles;
the intermuscular membrane and fascial sheaths ofthe recti muscles en-
close the retrobulbar space

Front 4

BULBAR SHEATH
(TENON'S CAPSULE)

Back 4

3. Bulbar sheath (Tenon's capsule)

a. Fascial covering ofthe posterior, unexposed part of the sclera; an
episcleral space lies between the bulbar sheath and sclera

Front 5

BULBAR SHEATH
(TENON'S CAPSULE)

*tendons of recti + oblique muscles pass through....

Back 5

3. Bulbar sheath (Tenon's capsule)

b. The tendons of the recti and oblique muscles pass through the episcleral
space to reach their insertions on the sclera; as they pierce the bulbar
sheath, their own fascial sheaths become continuous with it

Front 6

FASCIAE

MEDIAL AND LATERAL CHECK LIGAMENTS

Back 6

H. Fasciae

4. Medial and lateral check ligaments: medial and lateral hon/.ontal exten-
sions of the fascial sheaths of the medial rectus and lateral rectus, re-
spectively; they attach to the lacrimal and zygomatic bones, respectively,
and restrict eye movements

Front 7

FASCIAE

SUSPENSORY LIGAMENT OF THE EYE (LOCKWOOD'S LIGAMENT)

Back 7

H. Fasciae

5. Suspensory ligament ofthe eye (Lockwood's ligament')

a. Formed by medial and lateral extensions of tlie fascial sheath ofthe
inferior rectus; they attach to the medial and lateral check ligaments,
respectively, forming a fascial sling below the eyeball

Front 8

FASCIAE

SUSPENSORY LIGAMENT OF THE EYE (LOCKWOOD'S LIGAMENT)

CLINICAL NOTE

Back 8

H. Fasciae

5. Suspensory ligament of the eye (Lockwood's ligament')

b. Clinical note: entrapment ofthe suspensory ligament ofthe eye when
reducing a fracture of the floor of the orbit may render the eye
immobile