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Flashcards in BCSC Plastics Deck (238)
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121

Which muscles are the deep mimetic muscles?

buccinator, mentalis, levator anguli oris

122

What are the 5 major branches of the facial nerve (CN VII)?

Temporal, zygomatic, buccal, marginal mandibular, cervical

123

What are the 7 structural layers of the eyelids?

1) skin and subcutaneous tissue; 2) muscles of protraction; 3) orbital septum; 4) orbital fat; 5) muscles of retraction; 6) tarsus; 7) conjunctiva

124

What defines the upper eyelid crease?

The attachments of the levator aponeurosis to the pretarsal orbicularis bundles and skin

125

What defines the upper eyelid fold?

the loose preseptal skin and sucutaneous tissues above the confluence of the levator aponeurosis and orbital septum

126

What are the divisions of the orbicularis oculi muscle?

Orbital, pre-septal, and pre-tarsal

127

Which divisions of the orbicularis oculi muscle are involved in involuntary movement of the eyelids?

Pre-septal and pre-tarsal

128

Where does the orbital septum fuse with the levator aponeurosis in the upper eyelid?

2-5 mm above the superior tarsal border in non-Asians

129

Where does the orbital septum fuse with the capsulopalpebral fascia in the lower eyelid?

At or below the inferior tarsal border

130

What conditions can lead to anterior herniation of the orbital fat in the aging eyelid?

Thinning of the orbital septum and laxity of the orbicularis

131

How many orbital fat pockets are there in the upper and lower lids, respectively?

2 in the upper lid and 3 in the lower lid.

132

Where does the orbital fat lie in the upper and lower lids?

posterior to the orbital septum and anterior to the levator aponeurosis (upper lid) or the capsulopalpebral fascia (lower lid)

133

What are the retractors of the upper lid?

Levator muscle (with levator aponeurosis) and superior tarsal muscle (Muller muscle)

134

What are the retractors of the lower lid?

Capsulopalpebral fascia and inferior tarsal muscle

135

Where is the peripheral arterial arcade found?

between the levator aponeurosis and the Muller muscle, just above the superior tarsal border

136

How tall are the superior and inferior tarsal plates?

10-12mm (superior) and 4mm (inferior)

137

How are the tarsal plates connected to the periosteum of the orbit?

Via the medial and lateral canthal tendons

138

Where is the mucocutaneous junction of the eyelid located?

Just posterior to the meibomian gland orifices on the eyelid margin

139

When do most congenital anomalies of the eyelids occur?

During the second month of gestation

140

What are the components of Blepharophimosis Syndrome?

Blepharophimosis, telecanthus, epicanthus inversus, severe ptosis.

141

What are the common associations of congenital ectropion?

Blepharophimosis syndrome, Down syndrome, and icthyosis

142

What is euryblepharon?

From the Greek eurus, meaning "wide" -- unilateral or bilateral horizontal widening of the palpebral fissure, sometimes associated with blepharophimosis syndrome

143

What is ankyloblepharon?

From the Greek prefix ankyl, meaning "stiff, unmovable, adhesion" -- partial or complete fusion of the eyelids by webs of skin

144

What is epicanthus?

a medial canthal fold that may result from immature midfacial bones or a fold of skin and subcutaneous tissue

145

What are the 4 types of epicanthus?

tarsalis (upper eyelid), inversus (lower eyelid), palpebralis (equal between upper and lower eyelids), supraciliaris (arising from the eybrow region running to the lacrimal sac

146

What is epiblepharon?

A condition in which the lower eyelid pretarsal muscle and skin ride above the lower eyelid margin to forma horizontal fold of tissue, causing the lashes to assume a vertical position.

147

What is congenital distichiasis?

A rare, sometimes hereditary condition in which an extra row of lashes is present in place of meibomian gland orifices

148

Which skin is usually used for grafting eyelid defects?

Contralateral eyelid or pre-auricular or post-auricular skin

149

Should hair-bearing skin grafts be used around the eye?

No, they should be avoided if possible

150

Which is preferred in eyelid reconstruction -- full-thickness or split-thickness grafts?

Full-thickness grafts. Split-thickness grafts should be used only when adequate full-thickness skin is not available