Flashcards in Muscle Actions Deck (17)
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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
