Muscle Actions

Question 0

Trapezius ascending

Answer 0

Depresses

Question 1

Trapezius descending

Answer 1

Elevates

Question 2

Trapezius middle or all together

Answer 2

Retracts scapula

Question 3

Ascending and descending trapezius

Answer 3

Rotate glenoid cavity superiorly

Question 4

Latissimus dorsi

Answer 4

Adduction, extension, medial rotation of humerus

Also pull up motion

Question 5

Lavator scapula

Answer 5

Elevates scap

Tilts it’s glenoid cavity inferiorly by rotating scapula

Question 6

Rhomboids

Answer 6

Retract scapula
Fix scapula to thoracic wall
Rotate scapula to depress glenoid cavity

Question 7

Splenius alone

Answer 7

Lateral flexing of neck and ratation of easy to side of acting muscle

Question 8

Splenius together

Answer 8

Extend head and neck

Question 9

Erector spinae acting bilaterally

Answer 9

Extend vertebral column and head

As flexion occurs, they control motion by gradually lengthening their fibers

Question 10

Semispinalis

Answer 10

Extends head, thoracic and cervical regions, and rotates them contralaterally

Question 11

Multifidus

Answer 11

Stabilizes vertebrae during local movements

Unilateral contraction rotates to contralateral side

Question 12

Rotatores

Answer 12

Organs of proprioception

Stabilize vertebrae and assist with rotation and rotary movements of vertebral column

Question 13

Muscles of sub occipital triangle

Answer 13

Postural muscles acting on head directly

Question 14

Scm unilateral

Answer 14

Lateral flexion to same side

contralateral rotation

Question 15

Scm bilateral

Answer 15

Extends neck at atlantooccipital joint
Flexes cervical vert so that chin approaches manubrium
Extends superior vert while flexing inferior vert thrusting chin forward

Question 16

Platysma

Answer 16

Draws corners of mouth inferiorly as a sign for sadness

Draws skin of neck superiorly