Contents 1 Bony orbit Orbital openings Orbital fasciae

Contents. 1 Bony orbit , Orbital openings Orbital fasciae . 2 Surface anatomy of eyeball and eyelids . 3 Orbital contents • Eyeball • Lacrimal gland • Ocular muscles • Ophthalmic vessels • C. N. II, IV, V 1 & VI • Cilary ganglion

Bony Orbit

ROOF Orbital plate of frontal Lesser wing of sphenoid Orbital process of palatine Zygomatic bone Orbital surface of maxilla FLOOR • ������� 0. 5 -1. 00 ��. • Infection, tumor ��� air sinus ������ ��� �� • Fracture ���� �� �����

Medial wall Frontal process of maxilla Lacrimal bone Orbital plate of ethmoid Body of sphenoid bone Lateral wall Zygomatic bone Greater wing of sphenoid bone

Orbital openings

Orbital fasciae • fibrous tissue ��������� orbital contents. 1 Periorbita. 2 Orbital septum. 3 Bulbar sheath(. 4 Muscular fasciae Check ligaments Suspensory ligament of the eye

Surface anatomy of eyeball and eyelids

Caucasoid Mongoloid epicanthic fold Negroid

Eyelids

Eyeball • Outer fibrous coat : Cornea, Sclera • Middle vascular (pigmented) coat : Iris, Ciliary body, Choroid • Inner nervous coat : Retina Sinus venosus sclerae (Canal of Schemm( Glaucoma (������ (

Chamber of eye. 1 Anterior chamber. 2 Posterior chamber. 3 Vitreous camber Refracting media. 1 Cornea. 2 Aqueous humor. 3 Lens. 4 Vitreous humor Cataract (���� (

Lacrimal apparatus • Functions • �����. 1 Lacrimal gland. 2 Lacrimal canaliculi. 3 Lacrimal sac. 4 Nasolacrimal duct

Ocular muscles. 1 Extraocular muscles of eyeall 1. 1 Rectus muscle Medial, Lateral Superior, Inferior. 2 Intraocular muscles 2. 1 Ciliary muscles 2. 2 Sphincter pupillae and Dilator pupillae m. . 3 Muscles of eyelids 3. 1 Levator pupillae m. 3. 2 Palpebrae muscles of Muller ) smoo th muscle(

Extraocular muscles • Levator palpebrae superioris m. • Medial & Lateral rectus m. • Superior & Inferior oblique m. Common tendinous ring

�������� Vertical axis Horizontal axis Anteroposterior axis

Innervation of the orbit

Optic nerve Ganglion cells Bipolar cells Rods Cones retina

Oculomotor, Trochlear and Abducens nerves )CN. III, IV, and VI( SO 4 -LR 6 -all remainings 3

Ophthalmic Division of Trigeminal nerve (CN. V 1(

Automomic nerve supply of eye muscles

Automomic nerve supply of lacrimal glands

Blood supply of the orbit