Dermatomes

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Questions and Answers

Match the following cervical dermatomes with the areas they cover:

C2 = Back of the head and area behind the ears C4 = Area over the clavicles C6 = Thumb and index finger C8 = Little finger and medial part of the forearm

Match the following thoracic dermatomes with their corresponding body areas:

T1 = Level of the first rib T6 = Mid-chest area T10 = Level of the navel T12 = Level of the hip girdle

Match the following lumbar dermatomes with the areas they innervate:

L1 = Area over the inguinal ligament L3 = Medial knee L4 = Medial lower leg L5 = Dorsal foot and big toe

Match the following sacral dermatomes with their areas of coverage:

S1 = Lateral heel and most of the sole S2 = Back of the thigh S3 = Medial buttock S4 = Perineal region Signup and view all the answers

Match the coccygeal dermatome with its corresponding area:

Co = Skin over the coccyx C1 = No defined dermatome T12 = Level of the hip girdle L5 = Dorsal foot and big toe Signup and view all the answers

Match the following cervical dermatomes with their corresponding areas:

C2 = Back of the head and area behind the ears C4 = Area over the clavicles C6 = Thumb and index finger C8 = Little finger and medial part of the forearm Signup and view all the answers

Match the following lumbar dermatomes with the areas they cover:

L1 = Area over the inguinal ligament L3 = Medial knee L5 = Dorsal foot and big toe L2 = Upper thigh Signup and view all the answers

Match the following thoracic dermatomes with their positional description:

T1 = Level of the first rib T12 = Level of the hip girdle T6 = Mid torso area T3 = Upper chest area Signup and view all the answers

Match the following sacral dermatomes with their corresponding areas:

S1 = Lateral heel and most of the sole S2 = Back of the thigh S3 = Medial buttock S4 = Perineal region Signup and view all the answers

Match the following descriptions related to anatomical landmarks with their respective dermatomes:

Coccygeal Dermatome = Skin over the coccyx C5 = Lateral part of the upper arm T8 = Lower chest region L4 = Medial lower leg Signup and view all the answers

Which spinal nerve is noted for not having an associated dermatome?

C1 Signup and view all the answers

The trigeminal nerve provides sensory innervation to the skin of the body except for the face.

False Signup and view all the answers

What is the main reason C1 does not have an associated dermatome?

The posterior root for spinal nerve C1 is absent in many individuals. Signup and view all the answers

Spinal nerves provide sensory innervation to the skin of the entire body, except for the face, which is supplied by __________.

the trigeminal nerve Signup and view all the answers

Match the following spinal nerve descriptions with their characteristics:

C1 = No associated dermatome due to absent posterior root C2-C8 = Have associated dermatomes providing sensory innervation Cranial Nerve V = Provides sensory innervation to the face Spinal Nerves = Provide sensory innervation to the body excluding the face Signup and view all the answers

Study Notes

Cervical Dermatomes

C2 and C3 dermatomes cover the back of the head and the area behind the ears.
C4 dermatome covers the area over the clavicles.
C5 dermatome covers the lateral part of the upper arm.
C6 dermatome covers the thumb and index finger.
C7 dermatome covers the middle finger.
C8 dermatome covers the little finger and medial part of the forearm.

Thoracic Dermatomes

T1 to T12 dermatomes cover the torso in a band-like fashion.
T1 dermatome is at the level of the first rib.
T12 dermatome is at the level of the hip girdle.

Lumbar Dermatomes

L1 dermatome covers the area over the inguinal ligament.
L2 dermatome covers the upper thigh.
L3 dermatome covers the medial knee.
L4 dermatome covers the medial lower leg.
L5 dermatome covers the dorsal foot and big toe.

Sacral Dermatomes

S1 dermatome covers the lateral heel and most of the sole.
S2, S3, and S4 dermatomes cover the back of the thigh, the medial buttock, and the perineal region.

Coccygeal Dermatome

The Co dermatome covers the skin over the coccyx.

Cervical Dermatomes

C2 and C3 dermatomes cover the back of the head and the area behind the ears.
C4 covers the area over the clavicles.
C5 covers the lateral part of the upper arm.
C6 covers the thumb and index finger.
C7 covers the middle finger.
C8 covers the little finger and medial part of the forearm.

Thoracic Dermatomes

T1 to T12 cover the torso in a band-like fashion.
T1 is at the level of the first rib.
T12 is at the level of the hip girdle.

Lumbar Dermatomes

L1 covers the area over the inguinal ligament.
L2 covers the upper thigh.
L3 covers the medial knee.
L4 covers the medial lower leg.
L5 covers the dorsal foot and big toe.

Sacral Dermatomes

S1 covers the lateral heel and most of the sole.
S2, S3, and S4 cover the back of the thigh, the medial buttock, and the perineal region.

Coccygeal Dermatome

The coccygeal dermatome covers the skin over the coccyx.

Spinal Nerve C1

Spinal nerve C1 is unique because it does not have a corresponding dermatome
The absence of a posterior root for spinal nerve C1 in many individuals is the reason for this exception
Spinal nerves are responsible for providing sensory innervation to the skin of the entire body
The exception to this is the face, which is supplied by cranial nerve V (the trigeminal nerve)

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Description

This quiz covers the specific areas each dermatome affects, which is essential for understanding sensory functions in the body. Get ready to identify the regions covered by various dermatomes effectively.