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Carry double or triple irregular rows of eyelashes or cilia

Lack of cilia close to medial angle of eye

Posterior to cilia: pinpoint orifices of tarsal glands

o

Lacus lacrimal (lacrimal lake)

Triangular space

Separates upper and lower lid

Contains reddish prominence, caruncula

o

Where lacus meets eyelids

Small elevation: lacrimal papilla

Papilla has minute orifice, lacrimal punctum

Opening to canaliculus that drains lacrimal fluid into lacrimal sac

Obicularis Region

Obicularis oculi

o

Thick orbital portion

Surrounds orbital margin

Tight closure of eye

o

Palpebral portion

Contained in eyelids

Blinking

o

Originates from medial part of bony orbital margin and from medial palpebral ligament

Medial palpebral ligament: attached to anterior crest of fossa

o

Interlaced with frontalis muscle

Supraorbital nerve (CN V1) and vessels emerge from supraorbital foramen

Orbital septum

o

Oval membranous sheet attached to margin of orbit

o

Continuous with periorbita—the periosteum of orbital cavity

Tarsus

o

Condensed thickening of orbital septum

o

Stiffen eyelids

o

Each tarsus: 20-30 tarsal or Meibomian glands

Sebaceous glands

Secrete oily substance on free margin of eyelids

Prevents overflow of lacrimal fluid under normal conditions

If duct obstructedcyst (chalazion)

(hordeolum (sty)inflammation of ciliary gland)

lacrimal gland

o

superior lateral quadrant

o

6 to 10 ducts that connect gland to fornix of upper part of conjunctival sac

conjunctival sac: holds tears in lateral part of eye

lets fluid spread over eye and go to lacrimal sac

o

lacrimal sac: posterior to medial palpebral ligament

o

lacrimal sac leads to nasolacrimal duct

SCALP

layers

o

Skin

o

Superficial fascia: tough and dense subcutaneous tissue

Vessels and nerves run in it

o

Muscular layer

Contains frontalis muscle anteriorly, occiptalis muscle posteriorly

Two muscles are united by broad aponeurosis: epicranial aponeurosis or galea aponeurotica

o

Loose areolar tissue

Permits frontalis and occipitalis to move

Infections can spread within layer: dangerous area

Can be carried along veins that traverse skull

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