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ORBIT STEVEN J. ZEHREN, PH.D.

ORBIT STEVEN J. ZEHREN, PH.D. BONY ORBIT. RIGHT BONY ORBIT (ANTERIOR VIEW). Supraorbital notch (foramen). Posterior ethmoidal foramen. Frontal bone. Anterior ethmoidal foramen. Orbital plate of ethmoid bone (lamina papyracea). Lesser wing of sphenoid. Lacrimal bone.

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ORBIT STEVEN J. ZEHREN, PH.D.

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  1. ORBIT STEVEN J. ZEHREN, PH.D.

  2. BONY ORBIT

  3. RIGHT BONY ORBIT (ANTERIOR VIEW) Supraorbital notch (foramen) Posterior ethmoidal foramen Frontal bone 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

  4. RELATIONSHIPS OF BONY ORBIT (CORONAL SECTION) Brain Frontal sinus Ethmoidal cells Maxillary sinus

  5. RELATIONSHIPS OF BONY ORBIT (HORIZONTAL SECTION) Ethmoidal cells Nasal septum Temporalis m. (in temporal fossa) Brain (in middle cranial fossa) Optic n. Sphenoidal sinuses Medial wall of orbit

  6. EYEBALL

  7. EYEBALL (HORIZONTAL SECTION)

  8. SHEATHS OF THE OPTIC NERVE Central a. & v. of retina Pia Arachnoid Dura Subarachnoid space (Intervaginal space)

  9. OPTIC DISC (PAPILLA) Optic disc

  10. MUSCLES

  11. INTRINSIC MUSCLES OF EYEBALL Cornea Sclera Iris folds Lens Ciliary m. (accommodation) Dilator m. of pupil (mydriasis) Fibers of ciliary zonule (suspensory lig. of lens) Ciliary body Sphincter m. of pupil (miosis)

  12. AUTONOMIC INNERVATION OF THE EYE Short ciliary nn. Oculomotor (parasym. root) of ciliary ganglion Sphincter m. Dilator m. Ciliary g. Ciliary m. Accessory oculomotor (Edinger-Westphal) nucleus in midbrain V1 Long ciliary n. Int. carotid plexus Sympathetic root of ciliary g. Sup. cervical ganglion Lateral horn of T1 – T3 cord segments Pre- Post- Pre- Post- Sympathetic Parasympathetic

  13. POSITION OF CILIARY GANGLION Optic nerve Lateral rectus Ciliary ganglion Short ciliary nerves

  14. EXTRINSIC EYE MUSCLES (RIGHT LATERAL VIEW) 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.

  15. ORBITAL AXIS NOT THE SAME AS VISUAL AXIS ORBITAL AXIS VISUAL AXIS

  16. MOVEMENTS AROUND THE VERTICAL AXIS Inferior oblique Superior oblique Medial rectus Superior rectus Lateral rectus Inferior rectus ABDUCTORS ADDUCTORS

  17. MOVEMENTS AROUND THE LATEROMEDIAL (TRANSVERSE) AXIS Inferior oblique Superior oblique Superior rectus Inferior rectus ELEVATORS DEPRESSORS

  18. MOVEMENTS AROUND THE A-P AXIS Superior rectus Superior oblique INTORSION Inferior rectus Inferior oblique EXTORSION

  19. INNERVATION OF EXTRINSIC EYE MUSCLES (SO4, LR6, R3)

  20. MUSCLES OF THE UPPER EYELID Levator palpebrae superioris (striated muscle/oculomotor n.) Superior tarsal muscle (smooth muscle/sympathetic) Superior tarsal plate

  21. PERIORBITA & FASCIA

  22. PERIORBITA AND FASCIA (HORIZONTAL SECTION) Medial check ligament Lateral check ligament Periorbita Periorbita Medial rectus muscle and sheath Bulbar sheath (Tenon’s capsule) Lateral rectus muscle and sheath Orbital fat

  23. NERVES

  24. OPHTHALMIC NERVE (V1) Medial branch Supraorbital n. Lateral branch Supratrochlear n. Lacrimal n. Nasociliary n. Frontal n. Ophthalmic n. (V1) Trigeminal ganglion NFL (3 BRANCHES OF V1)

  25. OPHTHALMIC NERVE (V1) (DEEP DISSECTION) Long ciliary nn. Infratrochlear n. Anterior ethmoidal n. Posterior ethmoidal n. Nasociliary n. Lacrimal n. Frontal n. (cut) Ophthalmic n. (V1)

  26. VESSELS

  27. OPHTHALMIC ARTERY Medial palpebral a. Lateral palpebral a. Supratrochlear a. Dorsal nasal a. Supraorbital a. Anterior ethmoidal a. Posterior ciliary aa. Posterior ethmoidal a. Continuation of ophthalmic a. Lacrimal a. Muscular branch Central a. of retina Ophthalmic a. Internal carotid a.

  28. OPHTHALMIC VEINS Supratrochlear v. Supraorbital v. Superior ophthalmic v. Angular v. Cavernous sinus Vorticose vv. Facial v. Inferior ophthalmic v. Pterygoid plexus

  29. END OF LECTURE

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