motor points for bell's palsy
Reading File
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Finding Sources
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motor points Bell's palsy facial nerve electrotherapy physiotherapy
Finding Sources
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motor points facial nerve branches Bell's palsy frontalis orbicularis stimulation location
Reading Web Page
https://ijshr.com/IJSHR_Vol.6_Issue.4_Oct2021/IJSHR034.pdf
Here is a comprehensive breakdown of the motor points used in Bell's palsy physiotherapy:
Motor Points for Bell's Palsy
A motor point is the surface location on the skin overlying a muscle where electrical stimulation produces maximum muscle contraction with minimum current intensity. In Bell's palsy, these points are targeted using interrupted galvanic (IG) current or neuromuscular electrical stimulation (NMES) to prevent muscle atrophy, maintain tone, and facilitate nerve re-education.
Motor Points Organized by Facial Nerve Branch
1. Temporal Branch
- Frontalis - wrinkles forehead, raises eyebrows
- Corrugator supercilii - draws eyebrow medially and downward (frowning)
- Orbicularis oculi (upper portion) - eye closure
2. Zygomatic Branch
- Orbicularis oculi (lower portion) - eye closure, lid squint
- Nasalis - compresses/flares nostrils
3. Buccal Branch
- Procerus - pulls medial eyebrow downward
- Risorius - retracts angle of mouth (grimacing)
- Buccinator - compresses cheeks, aids chewing
- Levator labii superioris - elevates upper lip
- Levator anguli oris - elevates angle of mouth
- Nasalis (also receives buccal input)
- Orbicularis oris - puckers lips, closes mouth
- Zygomaticus major - draws corner of mouth upward and laterally (smiling)
- Zygomaticus minor - elevates upper lip
4. Marginal Mandibular Branch
- Mentalis - raises and wrinkles chin skin, protrudes lower lip
- Depressor labii inferioris - pulls lower lip downward and laterally
- Depressor anguli oris - depresses angle of mouth
5. Cervical Branch
- Platysma - draws lower lip and angle of mouth downward, tenses neck skin
6. Trunk of Facial Nerve
- Stimulated at the stylomastoid foramen (just anterior to the mastoid process, posterior to the earlobe) to activate all branches simultaneously
Key Motor Points Summary Table
| Motor Point | Location on Face | Branch |
|---|---|---|
| Frontalis | Forehead, above eyebrow, midline to lateral | Temporal |
| Corrugator supercilii | Above medial end of eyebrow | Temporal |
| Orbicularis oculi | Lateral orbital rim / lower eyelid | Temporal + Zygomatic |
| Nasalis | Over the side of the nose | Zygomatic + Buccal |
| Zygomaticus major | Cheek, along zygomatic arch to corner of mouth | Buccal |
| Zygomaticus minor | Medial to zygomaticus major | Buccal |
| Orbicularis oris | Around mouth (upper/lower) | Buccal |
| Levator labii superioris | Below the nose, above upper lip | Buccal |
| Risorius/Buccinator | Lateral cheek area | Buccal |
| Mentalis | Below lower lip, over chin | Marginal mandibular |
| Depressor anguli oris | Below corner of mouth | Marginal mandibular |
| Depressor labii inferioris | Below lower lip, lateral to mentalis | Marginal mandibular |
| Platysma | Over anterior neck | Cervical |
Electrotherapy Protocol at Motor Points
- Current type: Interrupted galvanic (IG) current (DC with interruptions) for denervated muscle; NMES (AC) once re-innervation begins
- Electrode placement: Active (small) electrode on the motor point; passive (large) electrode over C7 or interscapular region
- Dosage: Typically 30 contractions per point, 2 sets; facial trunk receives 1 set of 60 contractions
- Frequency: 5 sessions/week for 4 weeks is a common protocol
- Goal: Prevent fibrosis/atrophy, maintain muscle bulk, facilitate voluntary recovery
Clinical Tip
The 6 key muscles most commonly targeted in practice are:
- Frontalis
- Orbicularis oculi
- Zygomaticus major
- Orbicularis oris
- Mentalis
- Buccinator/Risorius
These cover the main functional facial movements - forehead wrinkling, eye closure, smiling, lip function, and chin movement - corresponding to the most functionally impactful deficits in Bell's palsy.
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