Orbicularis_Oculi_Official_Presentation.pptx

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1. Orbicularis Oculi Muscle Anatomy and Clinical Overview Prepared by Areeg Mohamed

2. Introduction The orbicularis oculi is a circular muscle surrounding the eye. It plays a vital role in closing the eyelids and protecting the eye.

3. Anatomy Overview It consists of three parts: the orbital, palpebral, and lacrimal parts.

4. Orbital Part Responsible for the forceful closure of the eyelids, such as during blinking or winking.

5. Palpebral Part Allows gentle eyelid closure, such as during sleep.

6. Lacrimal Part Assists tear drainage by compressing the lacrimal sac.

7. Origin Medial orbital margin and medial palpebral ligament.

8. Insertion Skin around the orbit and lateral palpebral raphe.

9. Nerve Supply Facial nerve (cranial nerve VII) — temporal and zygomatic branches.

10. Blood Supply Ophthalmic and facial arteries.

11. Actions 1. Closing eyelids 2. Blinking and winking 3. Assisting tear distribution

12. Function Provides eye protection and maintains tear film over the cornea.

13. Antagonist Muscle Levator palpebrae superioris — responsible for opening the eyelids.

14. Clinical Importance Facial nerve palsy can cause inability to close the eye (lagophthalmos).

15. Bell’s Palsy Causes facial muscle weakness including the orbicularis oculi.

16. Testing Ask the patient to close eyes tightly against resistance.

17. Aging Loss of tone leads to wrinkles known as crow’s feet.

18. Protective Role Prevents foreign particles from entering the eye and helps tear spreading.

19. Surgical Relevance Important in blepharoplasty and reconstructive surgery.

20. Summary Essential for facial expression and eye protection.

21. Thank You End of presentation.