Orbicularis oris
Musculus orbicularis oris
Closes and purses the lips.
- System
- Muscle
- Region
- Head
- Sides
- Single, on the midline
Where it runs from and to
A muscle is told apart from its neighbours by what it takes hold of at each end, which is also what decides what it does when it shortens.
- Origin
- No bony origin; the fibres encircle the mouth within the lips.
- Insertion
- Blends with the other muscles of the lips.
- Action
- Closes and purses the lips.
- Nerve
- Buccal branches of the facial nerve.
Written for Vetomica in its own words from the standard reference anatomy of the dog; the books it was checked against are listed below.
What it works on
Bones it takes hold of
- Incisive bone
- Mandible
Muscles and ligaments it works with
- Buccinator
- Buccinator pars buccalis
- Levator nasolabialis
- Levator labii superioris
- Caninus
- Incisivus superior
- Incisivus inferior
- Mentalis
- Depressor labii inferioris
- Zygomaticus
- Platysma
Terminology
- English
- Orbicularis oris
- Latin (NAV)
- Musculus orbicularis oris
- Status
- A valid term in the Nomina Anatomica Veterinaria
References
Where to read this structure in full, and where the named parts above were read.
- NAV 2017Myologia
- Miller's Anatomy of the Dog, 5th ed.The Muscular System: muscles of the head
- Dyce, Sack & WensingThe head and ventral neck of the dog and cat
- Miller 2020 (book pass)ch. 6 The Muscular System, PDF p. 462