Transcript Slide 1
ORBIT R. Shane Tubbs, MS, PA-C, PH.D. BONY ORBIT Supraorbital notch (foramen) Frontal bone Posterior ethmoidal foramen Anterior ethmoidal foramen Orbital plate of ethmoid bone (lamina papyracea) Lesser wing of sphenoid Lacrimal bone Superior orbital fissure Fossa of lacrimal sac Optic canal Orbital process of palatine bone Greater wing of sphenoid Zygomatic bone Inferior orbital fissure Maxillary bone Infraorbital groove & foramen Brain Frontal sinus Ethmoidal cells Maxillary sinus Ethmoidal cells Nasal septum Temporalis m. (in temporal fossa) Sphenoidal sinuses Brain (in middle cranial fossa) Optic n. Medial wall of orbit SHEATHS OF THE OPTIC NERVE Central a. & v. of retina Pia Arachnoid Dura Subarachnoid space (Intervaginal space) Optic disc MUSCLES INTRINSIC MUSCLES OF EYEBALL Cornea Sclera Iris folds Lens Ciliary m. (accommodation) Ciliary body Dilator m. of pupil (mydriasis) Fibers of ciliary zonule (suspensory lig. of lens) Sphincter m. of pupil (miosis) MUSCLES OF THE UPPER EYELID Levator palpebrae superioris Superior tarsal muscle Superior oblique m. Levator palpebrae superioris m. Trochlea (pulley) Superior rectus m. Medial rectus m. Common annular tendon Lateral rectus m. (cut) Inferior rectus m. Inferior oblique m. Trochlea Superior tarsal plate Levator palpebrae superioris m. Superior oblique m. Medial rectus m. Superior rectus m. (cut) Lateral rectus muscle Inferior rectus m. Superior rectus m. (cut) Levator palpebrae superioris m. (cut) MOVEMENTS AROUND THE VERTICAL AXIS Inferior oblique Superior oblique Medial rectus Superior rectus Lateral rectus Inferior rectus ADDUCTORS ABDUCTORS MOVEMENTS AROUND THE LATEROMEDIAL (TRANSVERSE) AXIS Inferior oblique Superior rectus ELEVATORS Superior oblique Inferior rectus DEPRESSORS MOVEMENTS AROUND THE A-P AXIS Superior rectus Superior oblique INTORSION Inferior rectus Inferior oblique EXTORSION SO4, LR6, R3 ABDUCENT NERVE INJURY PERIORBITA & FASCIA Medial check ligament Periorbita Medial rectus muscle and sheath Bulbar sheath (Tenon’s capsule) Lateral check ligament Periorbita Lateral rectus muscle and sheath Orbital fat NERVES L N N. F. L. F POSITION OF CILIARY GANGLION Optic nerve Lateral rectus Ciliary ganglion Short ciliary nerves VESSELS Medial palpebral a. Supratrochlear a. Lateral palpebral a. Dorsal nasal a. Supraorbital a. Anterior ethmoidal a. Posterior ciliary aa. Posterior ethmoidal a. Continuation of ophthalmic a. Muscular branch Ophthalmic a. Internal carotid a. Lacrimal a. Central a. of retina Supratrochlear v. Supraorbital v. Superior ophthalmic v. Cavernous sinus Angular v. Vorticose vv. Facial v. Inferior ophthalmic v. Pterygoid plexus