Muscles of facial expression Flashcards
What do they control?
- Communication
- Emotion
- Opening and closing of the nose and mouth
how are the muscles of mastication different to limb muscles
They attach directly to the fascia of muscles /skin- Few tendons/no ligaments
Superficial muscles
which are the muscles of facial expression
- Orbicularis oculi (palpebral and orbital)
- Buccinator
- Occipito-frontalis muscle
- Orbicularis oris
- Platysma
What does the orbiculares oculi
- opens and closes the eyelid
- involved in flow of tears
What does the buccinator do?
Keeps food in between teeth so it can be reached by the tongue and cheek
what does the occipito-frontalis muscle do?
- Scrunches up the forehead
- elevates the eyelids
- retracts the scalp
what does the orbicularis oris do?
opens and closes the mouth
what does the platysma do?
Depresses the mandible
Tenses the skin of face and neck
what innervates the muscles of the face?
The facial nerve- passes through the stylomastoid foramen and splits into its branches
what happens if the facial nerve is damaged?
- Eyes: droop
- Corner of mouth: droops
- Cheek: would bite cheek
Sensory innervation of the face
Via the trigeminal cranial nerve (v1/v2/ v3)
via C2/C3
look at dermatomal levels
Motor innervation of the face?
- muscles of mastication: V3
- muscles of facial expression: facial nerve
Blood supply to the face?
Via branches of the ECA:
- Facial artery
- Superficial temporal
Pathway of the facial artery
- Wraps around the mandible
- Lies anterior to masseter
- Grooves the submandibular Gland
- Ends near the medial aspect of the eye
