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The spinal cord and brain comprise the central nervous system, while the spinal nerves (branching to the spinal cord) and cranial nerves (branching to the brain) include the peripheral nervous system.
31 nerves extend out of the spinal cord and are connected to it by the nerve root. Each nerve branches about a half inch from the spinal cord before dividing into smaller branches. The dorsal rami are on the posterior side of the branch, while the larger ventral rami are on the anterior side.
The dorsal rami provides nerve function for the skin of the trunk and posterior muscles. The ventral rami from T1 to T12 provides nerve function to the trunk’s skin and the lateral and anterior muscles.
The anterior divisions that remain for plexuses are networks that provide nerve function to the body. Each plexus has specific areas on the body for skin sensitivity and particular muscles. The point where they exit the spine determines how they are numbered. The four primary plexuses are:
These spinal nerves have two sets of fibers: motor and sensory. Motor fibers facilitate movement and provide nerve function to the muscles. Sensory fibers facilitate sensitivities to touch, temperature, and other stimuli and provide nerve function to the skin.
Table of Contents
A group of muscles innervated by motor fibers stemming from a specific nerve root is called a myotome. An area of the skin innervated by sensory fibers stemming from a specific nerve root is called a dermatome. These patterns of myotome and dermatome are almost always identical from person to person. There are occasionally variances, but that is rare.
This consistency allows doctors to treat nerve pain in patients. If a certain area is hurting, they know that it is attributed to a certain myotome or dermatome, whichever the case may be, and its corresponding nerve root. Problems with nerve damage are often the result of stretching the nerve or compressing it.
When nerves are injured in specific areas, such as the lumbosacral or brachial plexus, sensory and motor deficits occur in the limbs that correspond to them. Myotomes and dermatomes are used to assess the extent of the damage.
When a doctor tests for nerve root damage in a patient, he or she will often test the myotomes or dermatomes for the nerves assigned to that location. A dermatome is examined for abnormal sensation, such as hypersensitivity or lack of sensitivity.
This is done using stimulus-inducing tools such as a pen, paper clip, pinwheel, fingernails, cotton ball, or pads of the fingers. The patient is instructed to provide feedback regarding their response. Some of the abnormal sensation responses include:
A myotome is tested for muscle nerve damage, which presents as weakness. This grading scale, which assigns a rating to the degree of muscle weakness, is often used:
During a typical chiropractic exam, your chiropractor will assess dermatomes and myotomes for potential neurological problems. This gives him or her additional insight into treating your condition, whether related to a subluxation of vertebral bodies or other disease processes.
General Disclaimer, Licenses and Board Certifications *
Professional Scope of Practice *
The information herein on "The Role of Dermatomes and Myotomes in Nerve Function" is not intended to replace a one-on-one relationship with a qualified health care professional or licensed physician and is not medical advice. We encourage you to make healthcare decisions based on your research and partnership with a qualified healthcare professional.
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Welcome to El Paso's Premier Wellness and Injury Care Clinic & Wellness Blog, where Dr. Alex Jimenez, DC, FNP-C, a Multi-State board-certified Family Practice Nurse Practitioner (FNP-BC) and Chiropractor (DC), presents insights on how our multidisciplinary team is dedicated to holistic healing and personalized care. Our practice aligns with evidence-based treatment protocols inspired by integrative medicine principles, similar to those on this site and on our family practice-based chiromed.com site, focusing on naturally restoring health for patients of all ages.
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Dr. Alex Jimenez DC, MSACP, APRN, FNP-BC*, CCST, IFMCP, CFMP, ATN
email: coach@elpasofunctionalmedicine.com
Multidisciplinary Licensing & Board Certifications:
Licensed as a Doctor of Chiropractic (DC) in Texas & New Mexico*
Texas DC License #: TX5807, Verified: TX5807
New Mexico DC License #: NM-DC2182, Verified: NM-DC2182
Multi-State Advanced Practice Registered Nurse (APRN*) in Texas & Multi-States
Multi-state Compact APRN License by Endorsement (42 States)
Texas APRN License #: 1191402, Verified: 1191402 *
Florida APRN License #: 11043890, Verified: APRN11043890 *
Colorado License #: C-APN.0105610-C-NP, Verified: C-APN.0105610-C-NP
New York License #: N25929, Verified N25929
License Verification Link: Nursys License Verifier
* Prescriptive Authority Authorized
ANCC FNP-BC: Board Certified Nurse Practitioner*
Compact Status: Multi-State License: Authorized to Practice in 40 States*
Graduate with Honors: ICHS: MSN-FNP (Family Nurse Practitioner Program)
Degree Granted. Master's in Family Practice MSN Diploma (Cum Laude)
Dr. Alex Jimenez, DC, APRN, FNP-BC*, CFMP, IFMCP, ATN, CCST
My Digital Business Card
Dr. Maria Cardenas, MD
(Board Certified in Internal Medicine)
Medical Director & Collaborative Physician
NPI # 1164426749
MD License #: J2933
Licenses and Board Certifications:
MD: Medical Doctor
DC: Doctor of Chiropractic
APRNP: Advanced Practice Registered Nurse
FNP-BC: Family Practice Specialization (Multi-State Board Certified)
RN: Registered Nurse (Multi-State Compact License)
CFMP: Certified Functional Medicine Provider
MSN-FNP: Master of Science in Family Practice Medicine
MSACP: Master of Science in Advanced Clinical Practice
IFMCP: Institute of Functional Medicine
CCST: Certified Chiropractic Spinal Trauma
ATN: Advanced Translational Neutrogenomics
Memberships & Associations:
TCA: Texas Chiropractic Association: Member ID: 104311
AANP: American Association of Nurse Practitioners: Member ID: 2198960
ANA: American Nurse Association: Member ID: 06458222 (District TX01)
TNA: Texas Nurse Association: Member ID: 06458222
NPI: 1205907805
| Primary Taxonomy | Selected Taxonomy | State | License Number |
|---|---|---|---|
| No | 111N00000X - Chiropractor | NM | DC2182 |
| Yes | 111N00000X - Chiropractor | TX | DC5807 |
| Yes | 363LF0000X - Nurse Practitioner - Family | TX | 1191402 |
| Yes | 363LF0000X - Nurse Practitioner - Family | FL | 11043890 |
| Yes | 363LF0000X - Nurse Practitioner - Family | CO | C-APN.0105610-C-NP |
| Yes | 363LF0000X - Nurse Practitioner - Family | NY | N25929 |
Dr. Alex Jimenez, DC, APRN, FNP-BC*, CFMP, IFMCP, ATN, CCST
My Digital Business Card
---------
Dr. Maria Cardenas, MD
(Board Certified in Internal Medicine)
Medical Director & Collaborative Physician
NPI # 1164426749
MD License #: J2933
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