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Anatomy Week 1 > Dermatomes & Myotomes > Flashcards

Dermatomes & Myotomes Flashcards

1
Q

Define Dermatome

A

A unilateral area of skin innervated by fibers from a single spinal nerve originating from a single spinal cord segment

- dermatomes are SENSORY
- there is overlap between dermatome regions
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2
Q

Specific Dermatomes and their Associated Body Parts

A 
C5 - Shoulder
C6 - Thumb
C7 - Middle Finger
C8 - Little Finger (pinkie)
T4 - Nipple
T10 - Umbilicus
L1 - Groin
L5 - Medial Foot
S1 - Lateral Leg/Foot
S2,3,4 - Anal Area
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3
Q

C5 Dermatome Sensory Area

A

Shoulder

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4
Q

C6 Dermatome Sensory Area

A

Thumb

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5
Q

C7 Dermatome Sensory Area

A

Middle Finger

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6
Q

C8 Dermatome Sensory Area

A

Little finger (pinkie)

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7
Q

T4 Dermatome Sensory Area

A

Nipple

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8
Q

T10 Dermatome Sensory Area

A

Umbilicus

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9
Q

L1 Dermatome Sensory Area

A

Groin

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10
Q

L5 Dermatome Sensory Area

A

Medial Foot

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11
Q

S1 Dermatome Sensory Area

A

Lateral Leg/Foot

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12
Q

S2,3,4 Dermatome Sensory Area

A

Anal Area

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13
Q

Definition of Myotomes

A

Myotomes are motor fibers acting on a specific region of the body

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14
Q

Specific Muscle Groups Innervated by Myotomes (Spinal Nerves)

A

C5 - Upper Extremity Abductors (deltoid, biceps)
C5/6 - Forearm Flexors (biceps, brachioradialis); Forearm Pronators
C7 - Forearm Extensor (triceps); Wrist & Finger Extensors
C8/T1 - Intrinsic Hand Muscles
L2 - Thigh Flexion (iliopsoas
L3/4 - Leg Extension (Quadriceps & Knee Jerk Reflection)
L4/5 - Foot Dorsiflexors & Toe Extensors (Anterior tibial muscles)
S1/2 - Foot Plantar & Toe Flexors (Posterior Tibial Muscles & Achilles’ tendon reflex)
S2/3/4 - Anal Contraction

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15
Q

Muscle Group Innervated by Myotome (Spinal Nerve) C5

A

Upper Extremity Abductors

- Deltoid & Biceps brachii

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16
Q

Muscle Group Innervated by Myotome (Spinal Nerve) C5/6

A

Forearm Flexors
- Biceps Brachii & Brachioradialis
Forearm Pronators

17
Q

Muscle Group Innervated by Myotome (Spinal Nerve) C7

A

Forearm Extensor
- Triceps Brachii
Wrist Extensors
Finger Extensors

18
Q

Muscle Group Innervated by Myotome (Spinal Nerve) C8/T1

A

Intrinsic Hand Muscles

19
Q

Muscle Group Innervated by Myotome (Spinal Nerve) L2

A

Thigh Flexion

- iliopsoas

20
Q

Muscle Group Innervated by Myotome (Spinal Nerve) L3/4

A

Leg Extension

- Quadriceps * *Knee Jerk Reaction**
21
Q

Muscle Group Innervated by Myotome (Spinal Nerve) L4/5

A

Foot Dorsiflexors
Toe Extensors
- Anterior Tibial Muscles

22
Q

Muscle Group Innervated by Myotome (Spinal Nerve) S1/2

A

Foot Plantar Flexors
Toe Flexors
- Posterior Tibial Muscles
Achillies Tendon Reflex

23
Q

Muscle Group Innervated by Myotome (Spinal Nerve) S2/3/4

A

Anal Contraction

Anatomy Week 1 (5 decks)

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