Lecture 18: Dermatomes, Myotomes, Plexuses Flashcards Preview

Year 1: 03. MSK Exam 1 > Lecture 18: Dermatomes, Myotomes, Plexuses > Flashcards

Flashcards in Lecture 18: Dermatomes, Myotomes, Plexuses Deck (18)
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1

Where are the nerves completely "differentiated" from one another?

In the anterior and posterior rootlets and roots

(Posterior is only sensory, anterior is only motor - there is no mixing)

2

What is the definition of a dermatome?

The area of skin innervated by afferent nerve fibers by a single posterior spinal root.

3

Where is the Epaxial Region in terms of Dermatomes?

The region of the spine and directly adjacent muscles

4

What dermatome corresponds to the top of the shoulder?

C4

5

What area makes up the C5 dermatome?

The area below the deltoid.
On the posterior side, the Deltoid is C4 and C5, mostly C4 on the anterior side

6

What dermatome corresponds to most of the lateral antebrachial region of the arm, including the first and lateral second digit?

C6

7

What dermatome corresponds to the middle finger?

C7

8

What dermatome corresponds to the little finger?

C8

9

What area of skin is the T1 dermatome?

The medial antebrachium

10

What dermatomes are associated with "Sciatica?"

The sacral dermatomes

(S1-S5)

11

What is shown in a "Nerve Map?"

The regions of skin innervated by a single cutaneous nerve

12

What is the definition of a Myotome?

The muscles innervated by a single efferent anterior root.

 

Note: Most muscles are composed of more than one myotome

13

What dermatome crosses the bellybutton?

T10

14

What dermatome crosses the nipple line?

T4

15

Which spinal nerves contribute to:

Musculocutaneous N.

C5-C7

16

Which spinal nerves contribute to:

Median N.

C6-T1

17

Which spinal nerves contribute to:

Ulnar Nerve

C8-T1

18

Which spinal nerves contribute to:

Radial Nerve

C5-T1