Salasche CH3 Skin Tension Lines Flashcards
skin tension lines are caused by factors involving tissue laxity, excessive skin, and shortening of collagenous fibrous septae contacting dermis to underlying muscle
F - lengthening of fibrous septae
skin tension lines run parallel to underlying muscles of facial expression
F, perpendicular
lines deepen with ageing
T
lines become more pronounced with ageing
T
process of developing RSTLs is accentuated by solar damage
T
if possible, the short axis of an excision should be placed parallel to the STLs
F, log axis
the scalp is loosely attached to the underlying galea
F, firmly attached
nose has horizontal lines at root due to procerus muscle contraction
T
STLs of cheek nicely correlate to the combined contractions of the lip and mouth angle retractors
T
STLs of anterior neck are invariably transverse
T
transverse lines across upper philtrum are due to orbicularis oris
F due to depressor sept nasi muscle
STLs are the result of complex interactions of intrinsic but not extrinsic factors
F, both
collagen is very inflexible
F, very flexible
collagen resists extensibility or stretch under sudden tension
T
when skin is at rest, collagen fibres intertwine in a random fashion
T
with tension, increasing numbers of collagen fibres become twisted and unruly
F, become aligned and straightened
elastic fibres are much thicker than collagen
F, usually thinner
linear wrinkles appear due to multiple attachments of fibres of the SMAS into the dermis
T. where fibrous attachments do not exist, such as jowls, baggy areas develop
where multiple muscle act in different directions, there is greater variation between individuals
T
forehead muscle frontalis acts in a horizontal direction
F, vertical direction which is why skin tension lines are horizontal
around mouth, there is little variation in the direction of STLs
F - significant variation
due to action of five groups of muscles
there are no muscles of facial expression over the temple and lateral zygomatic arch
T
tip of nose, earlobes and scalp have no STLs
T
INFRAORAL CREASE
- curved diagonal line extending from a point just lateral to the oral commissure to the labial-mental crease appearing to be a continuation of the nasolabial fold to the chin
T
pinching skin between the thumb and the forefinger will often demonstrate fine parallel wrinkle lines in the direction of the STL
T
technique of removing circular defect then waiting 3-5 min to see direction of STL forming oval is quite reliable (as long as patient is in a resting position)
T
