DERMATOMES : DEFINITION, DIAGRAM, & CHARTS 

Hello, This is a post about Dermatomes. Which are very useful in clinically for diagnosis of particular disease. 

So, here we discuss further about dermatomes 

What is Dermatomes ?

Dermatomes is a Particular are of the skin which pare mainly supply by single nerve root.

Why Dermatomes are Clinically Useful ?

It is useful for localised nerve lession any affection. Such a disease like Rediculopathy.

There Are 8 Cervical Nerve, 12 Thoracic Nerve, 5 lumbar Nerve, 5 Sacral Nerve.

Note :- C1 nerve root not supply any Area of the skin 

This Spinal nerve classified in to 5 group according to Regions of the Body

Dermatomes Diagram :-

C2 to C4 :- Supply to skin of the neck 

C5 to T1 :- Supply to skin of the arm 

T2 to T4 :- Supply to skin of the Chest and Abdomen

L3 to S1 :- supply to the skin of Leg 

S1 to S4 :- Supply to the skin of Groin 

Cervical Nerves and Their Dermatomes :- 

C2 : the base of the skull, behind the ear

C3 : the back of the head and the upper neck

C4 : the lower neck and upper shoulder

C5 : the upper shoulders and the two collarbones

C6 : the upper forearms and the thumbs and index fingers

C7 : the upper back, backs of the arms, and middle fingers

C8 : the upper back, inner arms, and ring and pinky fingers

Thoracic Nerves and Their Dermatomes :- 

T1 : the upper chest and back and upper forearm

T2, T3, and T4 : the upper chest and back

T5, T6, and T7 : the mid-chest and back

T8 and T9 : the upper abdomen and mid-back

T10 : the midline of the abdomen and the mid-back

T11 and T12 : the lower abdomen and mid-back

Lumbar Nerves and Their Dermatomes :- 

L1 : the groin, upper hips, and lower back

L2 : the lower back, hips, and tops of the inner thighs

L3 : the lower back, inner thighs, and inner legs just below the knees

L4 : the backs of the knees, inner sections of the lower legs, and the heels

L5 : the tops of the feet and the fronts of the lower legs

Sacral Nerves and Their Dermatomes :- 

S1 : the lower back, buttocks, backs of the legs, and outer toes

S2 : the buttocks, genitals, backs of the legs, and heels

S3 : the buttocks and genitals

S4 and S5 : the buttocks

Coccyx nerve root supply to area of coccyx bone.