HN [4: Ocular Motility and Face]

Trochlea

A

Superior oblique muscle

B

Medial rectus muscle

C

Annulus of Zinn

D

Levator palpebrae superioris muscle

E

Superior rectus muscle

F

Superior orbital fissure

G

Lateral rectus muscle

H

Inferior oblique muscle

I

Inferior rectus muscle

J

Spiral of Tillaux

Represents the distance of the insertion of the four recti muscles in reference to the corneal limbus

Annulus of Zinn

Ligamentous origin of the four recti muscles at the orbital apex

Annulus of Zinn

Encircles the superior orbital fissure and the optic foramen

Sphenoid bone periosteum

Origin of Superior oblique muscle

Maxillary bone

Origin of Inferior oblique muscle

Ophthalmic artery, Lacrimal artery, Infraorbital artery

Blood supply of EOMs come from the inferior and superior muscular branches of which artery

VI/ Abducens

Nerve Supply of Lateral Rectus

IV/ Trochlear

Nerve Supply of Superior Oblique

III/ Oculomotor

Nerve Supply of Medial Rectus

III/ Oculomotor

Nerve Supply of Inferior Oblique

Adduction

Primary Action of MR

Abduction

Primary Action of LR

Elevation

Primary Action of SR

Depression

Primary Action of IR

Intorsion

Primary Action of SO

Extorsion

Primary Action of IO

Adduction, Intorsion

Secondary Action of SR

Adduction, Extorsion

Secondary Action of IR

Adduction, Depression

Secondary Action of SO

Abduction, Elevation

Secondary Action of IO

Superficial Musculoaponeurotic System/ SMAS

Distributes facial muscle contraction, facilitating facial expression

Superficial Musculoaponeurotic System/ SMAS

Dissection, repositioning, and support of this have important implications for facial cosmetic surgeries

Brow

Indicator of facial expression and mood

Brow

Frames the eyes, first thing to be noticed when looking at the face

Brow

Position, composition, and angulation contribute to how a person is perceived in terms of mood and affect

Brow

Changes in position affects the eyelid appearance

Head, Body, Tail

Anatomic Parts of the Brow

Head

A

Body

B

Tail

C

Head

Anatomic Part of Brow: Start approximating inner corner of eye

Body

Anatomic Part of Brow: Peak of brow from inner limbus going to alae nasi

Tail

Anatomic Part of Brow: Ends by drawing line at an angle approximating the alae

Male

Fe/Male Eyebrow: Flat and Full

Male

Fe/Male Eyebrow: Sits on Superior Orbital rim

Female

Fe/Male Eyebrow: Thin and arched

Female

Fe/Male Eyebrow: Sits above the rim, Arch highest, medial to lateral canthus