Orbital anatomy tutorial

The video tutorial covers the anatomy and innervation of the eye, focusing on the orbicularis oculi muscle, sympathetic pathways, the lacrimal apparatus, and the layers of the eyeball. It explains the functions of various muscles and nerves, including the facial and oculomotor nerves, and describes the process of tear production and the role of the sympathetic nervous system in eye function.

Which muscle is responsible for closing the eyelid tightly?

• Orbicularis oculi

• Ciliary muscle

• Superior tarsal muscle

• Levator palpebrae superioris

What nerve innervates the lacrimal gland to stimulate tear production?

• Oculomotor nerve

• Trigeminal nerve

• Facial nerve

• Abducens nerve

Which layer of the eyeball is responsible for refracting incoming light?

• Sclera

• Cornea

• Choroid

• Retina

What is the function of the ciliary muscles in the eye?

• To produce tears

• To constrict the pupil

• To change the shape of the lens

• To dilate the pupil

Which muscle constricts the pupil to reduce light entry?

• Sphincter pupillae

• Levator palpebrae superioris

• Orbicularis oculi

• Dilator pupillae

What condition results from a lack of sympathetic innervation to the head?

• Bell's palsy

• Cataract

• Horner syndrome

• Glaucoma

Which nerve is responsible for the parasympathetic innervation of the sphincter pupillae muscle?

• Facial nerve

• Oculomotor nerve

• Trigeminal nerve

• Abducens nerve