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ANAT1019 Neuro > Dermatomes + Myotomes > Flashcards

Dermatomes + Myotomes Flashcards

1
Q

What are the three layers during the development of the nervous system?

A

ectoderm, mesoderm, endoderm

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2
Q

What is a dermatome?

A

the area of skin innervated by a single spinal cord segment (sensory neurons, dorsal root)

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3
Q

Key test point of dermatome C2?

A

1cm lateral to occipital protuberance or 3cm behind the ear

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4
Q

Key test point of dermatome C3?

A

supraclavicular fossa at midclavicular line

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5
Q

Key test point of dermatome C4?

A

over the acromioclavicular line

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6
Q

Key test point of dermatome C5?

A

lateral (radial) side of the cubital fossa just proximal to elbow crease

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7
Q

Key test point of dermatome C6?

A

thumb, dorsal surface, proximal phalanx

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8
Q

Key test point of dermatome C7?

A

middle finger, dorsal surface, proximal phalanx

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9
Q

Key test point of dermatome C8?

A

little finger, dorsal surface, proximal phalanx

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10
Q

Key test point of dermatome T1?

A

medial (ulnar) side just proximal to medial epicondyle of humerus

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11
Q

Key test point of dermatome T2?

A

apex of axilla

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12
Q

Key test point of dermatome T4?

A

nipple line at the midclavicular line

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13
Q

Key test point of dermatome T10?

A

umbilicus midclavicular line

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14
Q

Key test point of dermatome T12?

A

midpoint of the inguinal ligament

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15
Q

Key test point of dermatome L1?

A

midway distance between the key sensory points for T12 + L2

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16
Q

Key test point of dermatome L2?

A

anterior-medial thigh at mid thigh level

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17
Q

Key test point of dermatome L3?

A

medial femoral condyle above the knee

18
Q

Key test point of dermatome L4?

A

medial malleolus

19
Q

Key test point of dermatome L5?

A

dorsum of foot at 3rd metatarsophalangeal (MTP) joint

20
Q

Key test point of dermatome S1?

A

lateral heel

21
Q

Key test point of dermatome S2?

A

midpoint of popliteal fossa

22
Q

Key test point of dermatome S3?

A

ischial tuberosity/infragluteal fold

23
Q

Key test point of dermatome S4-5?

A

perianal area

24
Q

What is a myotome?

A

collection of muscle fibres innervated by the motor neurons from a single spinal segment (ventral root)

25
Q

Key action for myotome C1+2?

A

neck flexion and extension

26
Q

Key action for myotome C3?

A

neck lateral flexion

27
Q

Key action for myotome C4?

A

shoulder shrug

28
Q

Key action for myotome C5?

A

arm abduction (deltoid) OR substitution: elbow flexors (biceps brachii, brachialis)

29
Q

Key action for myotome C6?

A

elbow flexors (biceps and brachialis) and wrist extensors (ECRL and ECRB)

30
Q

Key action for myotome C7?

A

elbow extensors (triceps brachii)

31
Q

Key action for myotome C8?

A

finger flexors (FDP) to middle finger

32
Q

Key action for myotome T1?

A

small finger abductors (abductor digiti minimi)

33
Q

Key action for myotome L2?

A

hip flexors (iliopsoas)

34
Q

Key action for myotome L3?

A

knee extensors (quadriceps)

35
Q

Key action for myotome L4?

A

ankle dorsiflexors (tibialis anterior)

36
Q

Key action for myotome L5?

A

long toe extensors (extensor hallicus longus)

37
Q

Key action for myotome S1?

A

ankle plantar flexors (gastrocnemius, soleus)

38
Q

Key action for myotome S2?

A

knee flexion (biceps femoris, semitendinous, semimembranous)

39
Q

What are the 5 stages of neurulation?

A

notochord, neural plate, neural groove, neural tube, becomes CNS

40
Q

What are the 3 primary vesicles of the rostral neural tube?

A

prosencephalon, mesencephalon, rhombencephalon

41
Q

What are the 5 secondary vesicles of the rostral neural tube?

A

telencephalon, diencephalon, mesencephalon, metencephalon, myelencephalon

ANAT1019 Neuro (12 decks)

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