ORBIT

R. Shane Tubbs, MS, PA-C, PH.D.

BONY ORBIT

Frontal bone

Lesser wing of sphenoid

Superior orbital fissure

Optic canal

Greater wing of sphenoid

Zygomatic bone

Inferior orbital fissure

Infraorbital groove& foramen

Maxillary bone

Orbital process ofpalatine bone

Fossa of lacrimal sac

Lacrimal bone

Orbital plate of ethmoid bone(lamina papyracea)

Anterior ethmoidal foramen

Posterior ethmoidal foramen

Supraorbital notch (foramen)

Brain Frontal sinus

Ethmoidal cells

Maxillary sinus

Nasal septumEthmoidal cells

Sphenoidal sinuses

Brain (in middle cranial fossa)Optic n.

Medial wall of orbit

Temporalis m.(in temporal fossa)

SHEATHS OF THE OPTIC NERVE

Central a. & v. of retina

Pia

Arachnoid

Dura

Subarachnoid space(Intervaginal space)

Optic disc

MUSCLES

Cornea

Iris folds

Lens

Sclera

Sphincter m. of pupil(miosis)

Dilator m. of pupil(mydriasis)

Ciliary m.(accommodation)

Ciliary body Fibers of ciliary zonule(suspensory lig. of lens)

INTRINSIC MUSCLES OF EYEBALL

MUSCLES OF THE UPPER EYELID

Levator palpebrae superioris

Superior tarsal muscle

Trochlea (pulley)

Inferior oblique m.

Inferior rectus m.

Lateral rectus m. (cut)

Common annular tendon

Medial rectus m.

Superior rectus m.

Levator palpebrae superioris m.

Superior oblique m.

Superior tarsal plate

Levator palpebrae superioris m.

Superior rectus m. (cut)

Superior rectus m. (cut)

Lateral rectus muscle

Levator palpebrae superioris m. (cut)

Superior oblique m.

Medial rectus m.

Inferior rectus m.

Trochlea

MOVEMENTS AROUND THE VERTICAL AXIS

ADDUCTORS ABDUCTORS

Medial rectus

Superior rectus

Inferior rectus

Inferior oblique

Superior oblique

Lateral rectus

MOVEMENTS AROUND THE LATEROMEDIAL (TRANSVERSE) AXIS

ELEVATORS DEPRESSORS

Superior rectus

Inferior oblique

Inferior rectus

Superior oblique

MOVEMENTS AROUND THE A-P AXIS

INTORSION

EXTORSION

Superior rectus

Superior oblique

Inferior rectus

Inferior oblique

SO4, LR6, R3

ABDUCENT NERVE INJURY

PERIORBITA & FASCIA

Medial check ligamentLateral check ligament

Periorbita Periorbita

Medial rectus muscle and sheath

Bulbar sheath(Tenon’s capsule) Lateral rectus muscle

and sheath

Orbital fat

NERVES

N. F. L.

NF

L

POSITION OF CILIARY GANGLION

Ciliary ganglion

Lateral rectus

Optic nerve

Short ciliary nerves

VESSELS

Internal carotid a.

Ophthalmic a.

Muscular branch

Continuation of ophthalmic a.

Posterior ethmoidal a.

Anterior ethmoidal a.

Dorsal nasal a.

Supratrochlear a.

Medial palpebral a.

Lateral palpebral a.

Supraorbital a.

Posterior ciliary aa.

Lacrimal a.

Central a. of retina

Supratrochlear v.

Supraorbital v.

Angular v.

Facial v.

Vorticose vv.

Superior ophthalmic v.

Inferior ophthalmic v.

Cavernous sinus

Pterygoid plexus