The Eyelid Flashcards
What is an eyelid?
musculoskeletal-cutaneous structure
role of the eyelid?
- Eyeball protection
- Lacrimal drainage
- Facial expression
what seperate between The two eyelids?
palpebral fissure
where the two eyelids meet?
- canthus: intern and extern
What are the parts of the eyelid?
- Marginal
- Tarsal
- Palpebral
What is the tarsal part?
between the margin and palpebral fold or crease
What is the orbital part?
- beyond the palpebral fold
What is the continuation of the lower palpebral region with the face?
- Nasolabial fold or furrow
What cover the posterior palpebral side?
- the palpebral conjunctiva
length of margins?
30 mm
the thickness of the margin?
2-30 mm
The two parts of the margins?
- Lacrimal: 1/5, intern, without eyelashes
- Ciliary: 4/5 outer with eyelashes
what forms the intern angle?
- The two lacrimal portions
What forms the external angle?
- The upper and lower margins
what are the anatomical structures in the internal margin?
- Plica seminularis
- cranucle
role of the septum?
- transmits vasculo-nervous elements and ensures the contention of the orbital fat:
What is the tarsal plate?
fibrous connective tissue that give the shape of the eye
How the internal and extenal palpebral ligaments?
the meeing of the two tarsus
What are the two palpebral muscles?
- levator palpebral superioris
- orbicularos oculi
The action of te levator palpebral superioris?
- palpebral Opening
The innervation of the levator palpebral superioris?
- The occulomotor nerve
the origin of the levator palpabral superioris?
The apex of the orbit
The action of the Orbicularis oculi?
the palpebral occlusion
The innervation of the orbicularis oculi?
facial nerve
The parts of the Orbi Ocu
- The Orbital
- The palpebral
what are the parts of palpebral portion of the Orbicul oculi?
- marginal
- pretarsal
- preseptal
What is the other name of marginal portion
ciliary muscle or Riolan muscle
Where the pretarsal portion is attached to?
- Canthal tendon
What are the three glands of the eyelid?
- Moll’s : sweat
- Zeiss: sebaceous
- Meibomius: sebaceous
where the Moll’s gland located?
The lid margin
where the Zeiss located
attached to the eyelashes
Where the Meimbomius located
tarsal thickness
Stye vs Chalazion
- stye: obstruction of the zeiss
- Chalazion: obstruction of the Meimbomius
The arterial vascularization of the eyelid?
- palpebral arteries: superior and inferior < branches of ophthalmic artery
The venous supply?
- Upper lid: angular vein
- Lower lid: facial vein
Lymphatics?
- Sbcutaneous and subconjunctival < submaxillary nodes
Innervation?
- Trigeminal branches
- inside: nasal branch
- outside: Lacrimal
- upper: frontal
- lower: infra-orbital
