Botox Injection Sites for Migraines Diagram: 2026 Setup
The botox injection sites for migraines diagram outlines the standardized PREEMPT protocol requiring 31 shallow intramuscular injections across 7 key head and neck muscle groups. Delivering 5 units per site (155 total units) using a 30-gauge needle, the layout targets frontalis, temporalis, occipitalis, cervical paraspinal, trapezius, corrugator, and procerus muscles.
📌 Key Takeaways
- The PREEMPT protocol specifies 31 distinct injection sites delivering 5 units (0.1 mL) per location for a total standard dose of 155 units.
- Covers 7 primary head/neck muscle structures: Frontalis, Corrugator, Procerus, Occipitalis, Temporalis, Cervical Paraspinal, and Trapezius.
- Injections require shallow intramuscular placement using a 30-gauge, 0.5-inch needle at a 45-to-90-degree angle depending on muscle mass.
- Ptosis (eyelid drooping) is the most common anatomical mapping error, usually resulting from injecting too low near the corrugator or orbital rim.
- This diagram serves as a clinical reference map; administration must strictly be performed by a licensed medical professional.
The standardized botox injection sites for migraines diagram provides a precise anatomical framework for administering OnabotulinumtoxinA under the Phase III REsearch Evaluating Migraine Prophylaxis Therapy (PREEMPT) clinical protocol. This diagram maps 31 to 39 target intramuscular sites across seven specific head and neck muscle groups to inhibit peripheral nociceptive signaling to the central nervous system. Precise execution of this spatial configuration prevents neurotoxin diffusion into unintended facial or cervical structures while ensuring therapeutic saturation of sensory nerve terminal networks. Clinical practitioners utilize this schematic layout to standardize dosage delivery, maintain bilateral balance, and eliminate treatment variability during chronic migraine prophylaxis procedures.
Anatomy Layout in the Botox Injection Sites For Migraines Diagram
Understanding the anatomical layout represented in the botox injection sites for migraines diagram requires breaking down the target region into seven distinct bilateral and midline muscle zones. The PREEMPT paradigm dictates a baseline delivery of 155 Units of OnabotulinumtoxinA distributed across 31 fixed locations, with optional expansion up to 195 Units across 39 sites utilizing a follow-the-pain strategy. Each injection point corresponds to key terminal branches of the trigeminal and cervical vascular-nerve complexes.
| Muscle Group Structure | Site Count | Units per Site | Total Base Units | Needle Depth & Vector | Anatomical Landmark Target |
|---|---|---|---|---|---|
| Corrugator | 2 (1 per side) | 5 U (0.1 mL) | 10 U | Subcutaneous/Shallow IM, 45° angled superiorly | 1.5 cm superior to medial orbital rim |
| Procerus | 1 (Midline) | 5 U (0.1 mL) | 5 U | Intramuscular, 45° angled superiorly | Midline above nasal ridge (glabella center) |
| Frontalis | 4 (2 per side) | 5 U (0.1 mL) | 20 U | Subcutaneous/Shallow IM, 45° angled superiorly | Parallel line 1.5 cm above corrugator sites |
| Temporalis | 8 (4 per side) | 5 U (0.1 mL) | 40 U | Intramuscular, 90° perpendicular | Temporal fossa, superior to zygomatic arch |
| Occipitalis | 6 (3 per side) | 5 U (0.1 mL) | 30 U | Intramuscular, 90° perpendicular | Superior nuchal line above occipital ridge |
| Cervical Paraspinal | 4 (2 per side) | 5 U (0.1 mL) | 20 U | Intramuscular, 45° angled medially | Paraspinal muscle belly, C2 to C5 level |
| Trapezius | 6 (3 per side) | 5 U (0.1 mL) | 30 U | Intramuscular, 90° perpendicular | Mid-to-upper trapezius muscle ridge |
Frontal and Glabellar Muscle Group Configuration
The anterior region shown on the diagram consists of three intertwined muscle complexes: the corrugator supercilii, procerus, and frontalis muscles. The corrugator sites are located bilaterally, approximately 1.5 cm superior to the medial supraorbital ridge. Placing points directly above the bony ridge avoids neurotoxin diffusion into the levator palpebrae superioris muscle. The single procerus site is positioned on the midline directly between the medial eyebrows (glabella), forming an inverted triangle with the two corrugator sites. Superior to these, the four frontalis points are arranged in two bilateral horizontal pairs, positioned 1.5 cm above the corrugator level along an imaginary line drawn vertically from the mid-pupillary point.
Temporalis and Occipitalis Anatomical Components
The temporal and posterior head regions account for 70 Units of the base 155 Unit dosage configuration. The temporalis zone incorporates four distinct injection sites per side, spaced 1.5 to 2.0 cm apart within the temporal fossa belly above the zygomatic arch. These sites map across the anterior, middle, and posterior fibers of the temporalis muscle. Moving posteriorly, the occipitalis zone includes three injection sites per side positioned directly above the superior nuchal line. The innermost site sits adjacent to the external occipital protuberance, while the outer two sites extend laterally, staying superior to the occipital artery path to prevent intravascular needle puncture.
Cervical Paraspinal and Trapezius Muscle Structure
The neck and upper shoulder layout comprises two bilateral groups designed to stabilize cervical nociceptive inputs. The cervical paraspinal group features two sites per side located parallel to the C2–C5 spinous processes, positioned approximately 1.5 cm lateral to the cervical midline within the splenius capitis and semispinalis capitis muscle bellies. The trapezius group contains three sites per side positioned across the upper margin of the trapezius muscle belly between the neck junction and the acromion process. These sites target hypertonic trigger zones that frequently exacerbate cervicogenic migraine components.
PREEMPT System Configuration and Site Mapping Protocol
Accurately reading and executing the layout in the botox injection sites for migraines diagram requires establishing systematic anatomical landmarks, verified reconstitution concentrations, and correct needle trajectory angles before needle skin entry. Practitioners must visualize the underlying muscle belly contours rather than relying solely on surface dermal markers.
According to OEM clinical specifications, a standard 100 Unit vial of OnabotulinumtoxinA must be reconstituted with 2.0 mL of sterile, preservative-free 0.9% Sodium Chloride Injection, USP. This yield provides a standardized concentration of 5 Units per 0.1 mL volume. Each designated point on the PREEMPT diagram corresponds precisely to a single 0.1 mL injection aliquot delivered using a 1.0 mL tuberculin syringe.
Mapping PREEMPT Dosage Distribution Across Injection Sites
To transcribe the blueprint onto patient anatomy, start by establishing the midline anatomical baseline extending from the glabella over the sagittal suture down to the C7 spinous process. Begin injections in the glabellar region, completing the midline procerus site followed by the bilateral corrugators. Move superiorly to map the frontalis grid, ensuring all four points reside on the upper two-thirds of the forehead to prevent brow ptosis. When referencing secondary procedures, integrating a comprehensive trigeminal nerve mapping protocol and reviewing neuromuscular block injection vectors enhances precision during complex cranial neurotoxin delivery.
Proceed next to the temporalis muscle zone. Instruct the patient to clench their jaw to palpate the main muscle belly, then mark four evenly spaced grid points in a crescent pattern following the hair line contour. For the occipital region, locate the occipital protuberance and palpate the muscle ridge laterally toward the mastoid process. Mark three points on each side along this ridge. Finally, map the cervical paraspinal sites 1.5 cm lateral to the spinous processes and space the three trapezius points equidistant along the shoulder shelf.
Identifying Injection Depth and Needle Positioning Schematics
Needle selection and insertion angle vary based on muscle depth across the diagram. A 30-gauge, 0.5-inch (12.7 mm) needle is standard for all PREEMPT protocol sites. The frontal and glabellar muscle groups require shallow intramuscular or deep subcutaneous delivery with the needle oriented at a 45-degree angle pointing superiorly away from the orbit. This bevel orientation prevents downward neurotoxin migration toward the upper eyelid apparatus.
Needle depth must be strictly governed by tissue thickness:
• Glabellar/Frontalis: 45° angle, ~3 mm depth into muscle belly.
• Temporalis: 90° angle, ~6 to 10 mm depth into dense temporalis fascia/belly.
• Occipitalis/Cervical Paraspinal: 90° or 45° medial angle, ~8 to 12 mm depth.
• Trapezius: 90° angle, ~10 to 12.7 mm deep into thick muscle core; avoid deep anterior advancement to prevent pneumothorax in thin patients.
For the thicker temporalis, occipitalis, and trapezius muscle masses, insert the needle perpendicular (90 degrees) to the skin surface until penetrating the fascia into the muscle belly center. Before injecting the 0.1 mL volume into occipital or cervical sites, perform brief aspiration to confirm the needle tip has not cannulated the occipital artery or deep cervical vessels.
Botox Injection Sites For Migraines Diagram Clinical Deviations and Troubleshooting
Clinical variations in patient head structure, asymmetry, and localized muscle hypertrophy frequently require adjustments to the baseline diagram blueprint. Identifying protocol deviations early prevents adverse functional complications and ensures maximum prophylactic efficacy.
Injecting lower than 1.5 cm above the supraorbital margin, or using excessive fluid volume (>0.1 mL per site), increases the risk of neurotoxin diffusion through the orbital septum into the levator palpebrae superioris muscle. This causes blepharoptosis (eyelid drooping). If ptosis occurs, treat with apraclonidine 0.5% ophthalmic solution (1-2 drops, 3 times daily) to stimulate Müller’s muscle contraction until neurotoxin effects subside.
Managing Asymmetric Spread and Eyelid Ptosis Complications
When executing the frontalis layout, individual forehead height variations can disrupt standard grid spacing. Patients with shorter foreheads (less than 4 cm between eyebrow and hairline) require subtle site compression while strictly maintaining the 1.5 cm supraorbital safety buffer. If a patient experiences asymmetrical eyebrow elevation (“Mephisto” or “spock” brow sign) following treatment, this indicates incomplete lateral frontalis denervation. Correct this deviation by delivering a 2.5 to 5 Unit booster dose into the hyperactive lateral frontalis fibers superior to the tail of the eyebrow.
Adjusting Dosing Vectors for Refractory Cervical Neck Pain
In patients presenting with severe, localized pain vectors, clinicians can implement the PREEMPT “follow-the-pain” extension protocol. This strategy permits an additional 40 Units (8 total extra sites) distributed selectively across three muscle groups: temporalis (up to 2 additional sites / 10 U per side), occipitalis (up to 2 additional sites / 10 U per side), and trapezius (up to 4 additional sites / 20 U per side). Integrating this flexibility into the standard schematic addresses localized myofascial trigger points while maintaining therapeutic compliance. Reviewing standardized chronic migraine diagnostic criteria ensures that total administered dosages do not exceed 195 Units per treatment session.
Anatomical Schematic FAQs for Chronic Migraine Prophylaxis
What total dosage is detailed in the standard PREEMPT migraine schematic?
The base PREEMPT protocol schematic outlines a mandatory minimum dosage of 155 Units of OnabotulinumtoxinA distributed across 31 fixed injection sites. When utilizing the additional “follow-the-pain” strategy for refractory pain, the blueprint expands up to 39 total sites and a maximum clinical ceiling of 195 Units per treatment cycle.
Which muscle sites require the highest unit concentration on the diagram?
The temporalis muscle complex represents the largest regional concentration in the standard fixed schematic, receiving 40 Units total divided across 8 injection points (4 sites per side). The occipitalis and trapezius muscle groups each receive 30 Units total divided across 6 points (3 sites per side).
How does needle angle configuration prevent vascular or bony contact?
Angling the needle at 45 degrees superiorly in the frontal and glabellar regions prevents the needle tip from contacting the frontal bone periosteum, minimizing periosteal pain and hematoma formation. In posterior regions, maintaining a controlled depth and perpendicular angle while aspirating prevents needle advancement into the occipital artery and deep cervical vascular structures.
What anatomical landmarks define the frontalis injection blueprint?
The frontalis sites are defined by drawing a horizontal reference line parallel to and at least 1.5 cm superior to the corrugator injection points (which are themselves 1.5 cm above the supraorbital ridge). The four points are positioned symmetrically along this line, aligned vertically with the mid-pupillary lines and the lateral canthi.
How are follow-up booster sites mapped for partial treatment response?
Follow-up evaluations performed at 12-week intervals assess residual muscle hyperactivity and pain localization. If a partial response occurs, clinicians utilize the optional 8 “follow-the-pain” sites mapped on the extended schematic, directing additional 5 Unit (0.1 mL) doses specifically into the temporalis, occipitalis, or trapezius muscle bellies showing dominant nociceptive focus.
Step-by-Step Guide to Understanding the Botox Injection Sites For Migraines Diagram
Identify – Review patient history and identify the 7 key muscle structures on the anatomical chart.
Locate – Map anatomical landmarks including the eyebrow arch, occipital ridge, and trapezius line.
Reference – Cross-check site coordinates on the diagram to ensure symmetric 31-point placement.
Connect/Route – Administer 5 units per site intramuscularly following the PREEMPT distribution configuration.
Verify – Verify equal unit distribution (155 units total) and check site symmetry post-injection.
Troubleshoot – Evaluate post-procedure response for site tenderness, asymmetry, or muscle weakness.
