SMAS Flashcards
What is SMAS an upward extension of?
Superficial cervical fascia
Where is SMAS thickest?
Thickest over the parotid and becomes thinner medially
Where SMAS attach?
SMAS attaches to fascia around around zygomatic muscles anteriorly
Describe the continuity of SMAS
The fascia of the platysma muscle is part of the superficial cervical fascia and is continuous with the SMAS below
The temporoparietal fascia (superficial temporal fascia) is an extension of the SMAS over the temporal region
Layers around temporal region
- Temporoparietal fascia
- Parotidotemporal fascia
** The facial nerve runs just deep to the parotidotemporal fascia - Superficial layer of the deep temporal fascia
- Deep layer of the deep temporal fascia
**From the level of the superior orbital margin to the zygomatic arch, the superficial and deep layers of the deep temporal fascia are separated from each other by the intermediate temporal fat pad
Note: The galea runs over the scalp and is continuous with the SMAS, frontalis, and temporoparietal fascia
Where is the Fixed SMAS?
Fixed SMAS:
Adheres to and lies over the parotid
Thicker portion of the SMAS allowing greater protection of the facial nerve
Where is the mobile SMAS?
Mobile SMAS:
Lies beyond (i.e., anterior) the parotid gland, directly over the mimetic muscles, facial nerves, and parotid duct
Not adherent, tends to be relatively thin, and relatively mobile
At its most anterior extent, the mobile SMAS forms the fascia around the zygomaticus major, which can be a tethering point
Traction and mobilization of the mobile SMAS allow movement of the midface and lower face during rhytidectomy
Allow proper elevation, repositioning, and rotation for optimal outcome
How does FN innervate facial muscles? on deep or superficial surface?
All recieve FN superficially except for “MLB”—mentalis, levator anguli oris, buccinator
