Muscle Actions Flashcards Preview

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Flashcards in Muscle Actions Deck (17)
0

Trapezius descending

Elevates

1

Trapezius ascending

Depresses

2

Trapezius middle or all together

Retracts scapula

3

Ascending and descending trapezius

Rotate glenoid cavity superiorly

4

Latissimus dorsi

Adduction, extension, medial rotation of humerus
Also pull up motion

5

Lavator scapula

Elevates scap
Tilts it's glenoid cavity inferiorly by rotating scapula

6

Rhomboids

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

7

Splenius alone

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

8

Splenius together

Extend head and neck

9

Erector spinae acting bilaterally

Extend vertebral column and head
As flexion occurs, they control motion by gradually lengthening their fibers

10

Semispinalis

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

11

Multifidus

Stabilizes vertebrae during local movements
Unilateral contraction rotates to contralateral side

12

Rotatores

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

13

Muscles of sub occipital triangle

Postural muscles acting on head directly

14

Scm unilateral

Lateral flexion to same side
contralateral rotation

15

Scm bilateral

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

16

Platysma

Draws corners of mouth inferiorly as a sign for sadness
Draws skin of neck superiorly