Week 1 Dermatomes, Myotomes, Joints- Severson

Question 1

Define dermatome and myotome

Answer 1

Dermatome = unilateral area of skin innervated by the nerve fibers of a single nerve that originates from a single cord segment
Myotome = spinal nerves innervating groups of muscles

Question 2

dermatome of C5

Answer 2

shoulder

Question 3

dermatome of T4

Answer 3

nipple

Question 4

dermatome of T10

Answer 4

umbilicus

Question 5

dermatome of L5

Answer 5

medial foot/ dorsum of the foot

Question 6

dermatome of S1

Answer 6

lateral leg/foot

Question 7

Spinal nerve to upper extremity abductors (deltoid, biceps)

Answer 7

C5

Question 8

spinal nerve to forearm flexors (biceps, brachioradialis)

Answer 8

C5-6

Question 9

Spinal nerve to triceps

Answer 9

C7

Question 10

spinal nerve to quadriceps

Answer 10

L3-4

Question 11

spinal nerve to achilles

Answer 11

S1-2

Question 12

What spinal cord segments supplies motor innervation to the intrinsic muscles of the hand?

Answer 12

C8-T1

Question 13

What spinal cord segments supplies motor innervation to the intrinsic muscles of the anal sphincter

Answer 13

S234

Question 14

dermatome of C6

Answer 14

thumb (lateral/radial regions of the hand)

Question 15

dermatome of C7

Answer 15

middle finger

Question 16

dermatome of C8

Answer 16

little finger (ulnar/medial regions of the hand)

Question 17

Synarthroses

Answer 17

(together joints) bones are separated by connective tissue which prevents limited movement

Question 18

Syndesmosis

Answer 18

type of synarthroses - bones are joined by intervening fibrous tissue
ex: membrane between radius and ulna and joints between skull bones

Question 19

Synchondrosis

Answer 19

type of synarthroses- two bones are separated from each other by cartilage which permits very limited movement

Ex: Epiphyseal plate, intervertebral disc, and symphysis

Question 20

Synostosis

Answer 20

type of synarthroses- two bones are joined together by bone

Ex: frontal bone, epiphyseal plate

Question 21

Diarthroses/ Synovial Joints have what common features?

Answer 21

• Synovial space: an articular cavity or discontinuity between bones
• synovial fluid
• synovial membrane
• Articular surface (smooth surfaces for articulation)

Question 22

What produces synovial fluid?

Answer 22

serous membrane

Question 23

What is a bursae?

Answer 23

closed scas or cavities of synovial membrane usually separating bone from overlying tendon of muscle filled with synovial fluid.

• Bursae reduce friction between structures
• communicate with synovial cavity of adjacent joint

Question 24

Arthritis
Synoyitis
Bursitis

Answer 24

Arthritis = inflammation of join
Synoyitis = inflammation of the synovial membrane of joint
Bursitis = inflammation of a bursa

Question 25

hinge joints

Answer 25

permit flexion and extension only