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function of Orb. ocul.
close the eyelids by a sphincter action, spreading tears and flushing away waste
function of Pyramidalis (procerus)
creates transverse furrows above your nose (a bad smell expression)
4 functions of eyelids
protection, tear production, spread of tears across cornea, drainage of tears
6 structures of the eyelids
1.skin 2. subcutaneous layer 3. muscles 4. submuscular areolar layer 5. fibrous layer 6. palpebral conjunctiva
the outermost layer is composed of
keratinized epithelial layer and many non-keratinized layers of epithelial cells
6 cell types in the epidermis
epithelial cells, keratinocytes, melanocytes, Langerhans & merkel cells, and neurons
Keratinization of surface epithelium does or does not include epithelial lining of tarsal gland orifice
at the lateral angle the fibers of Orbicularis oculi meet at the ____ _____ ___
Lateral palpebral raphe
Paralysis of CN VII leads to this
Lag ophthalmus, a dry eye condition due to inability to close the eyelids
origination of Levator palpebrae superioris
it originates from the inferior surface of the lesser wing of the sphenoid bone
levator palp. sup. origination location in relation to optic canal
above and anterior to the optic canal
what allows the upper lid to be everted
well developed tarsal plate collagen (not as much in the lower lid)
Mucin (MUC 5AC) producing, unicellular holocrine glands that make up the inner layer of the tears.
rich innervation of tarsal gland
majority parasympathetic with sympathetic and sensory sources contributing to a lesser extent
sterile lesion caused by chronic inflammation of tarsal gland
Chalazion (sometimes independent of chronic inflammation= de novo)
function of mucous from goblet cells
acts as a wetting agent and helps spread tears across the cornea.
complex ductal system
connects palpebral accessory lacrimal gland to the palpebral conjunctival surface
possibly artificial wrinklings of the tissue resulting from fixation induced shrinkage of the specimen
Crypts of Henle
name veins of superficial system and where they drain
Anterior facial V drains to internal jugular V and Superficial temporal V drains to external jugular V
Name Veins of Deep system and where they drain
Ophthalmic V drains to cavernous sinus and Deep facial V to pterygoid plexus then cavernous sinus.
Eye itself has no lymph but eyelid has 2 systems name them
Superficial (pre-tarsal) and Deep (post-tarsal)
provides inhibitory innervation to tarsal muscles and primary innervation to tarsal gland
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