Muscles of Shoulder Muscles of Shoulder GirdleGirdle

Chapter 4Chapter 4

Movements of the Scapula Movements of the Scapula

1. Elevation 1. Elevation

2. Depression2. Depression

3. 3. AdductionAdduction (retraction) (retraction)

4. 4. AbductionAbduction (protraction) (protraction)

5. Downward rotation5. Downward rotation

6. Upward rotation6. Upward rotation

Anterior MusclesAnterior Muscles

Pectoralis MinorPectoralis Minor Serratus AnteriorSerratus Anterior

Pectoralis MinorPectoralis Minor

Origin: Anterior surface Origin: Anterior surface of 3, 4, and 5 ribsof 3, 4, and 5 ribs

Insertion: Coracoid Insertion: Coracoid processprocess

Actions: Actions: Abduction of the Abduction of the

scapulascapula Downward rotation of Downward rotation of

the scapulathe scapula Depression of the Depression of the

scapulascapula

Serratus AnteriorSerratus Anterior

Origin: Lateral surface Origin: Lateral surface of upper 8 ribsof upper 8 ribs

Insertion: Anterior Insertion: Anterior surface of medial surface of medial border and inferior border and inferior angle of scapula.angle of scapula.

Actions: Actions: Abduction of the scapulaAbduction of the scapula Upward Rotation of the Upward Rotation of the

scapulascapula

Posterior MusclesPosterior Muscles

Levator ScapluaeLevator Scapluae TrapeziusTrapezius RhomboidRhomboid

Levator ScapulaeLevator Scapulae

Origin: Transverse Origin: Transverse processes of the first 4 processes of the first 4 cervical vertebrae.cervical vertebrae.

Insertion: Superior Insertion: Superior angle and medial angle and medial border of the scapula.border of the scapula.

Actions: Actions: ElevationElevation of of the scapulathe scapula

TrapeziusTrapezius Origin: Occipital bone, ligamentum Origin: Occipital bone, ligamentum

nuchae, spinous process of the C7 and nuchae, spinous process of the C7 and all Thorasic vertebrae all Thorasic vertebrae

Insertion: Insertion: 1. Lateral 1/3 of clavicle.1. Lateral 1/3 of clavicle. 2. Top of Acromion process.2. Top of Acromion process. 3. Upper border of spine of the 3. Upper border of spine of the

scapula.scapula. 4. Medial surface of spine of the 4. Medial surface of spine of the

scapula.scapula. Actions:Actions:

Upper – elevation of the scapulaUpper – elevation of the scapula Middle – elevation, upward rotation, & adduction Middle – elevation, upward rotation, & adduction of the scapulaof the scapula Lower – depression, Lower – depression, ACAC adduction and upward rotation adduction and upward rotation of the scapulaof the scapula

Upper – elevation

Middle – elevation, upward rotation, & adduction

Lower – depression, adduction and upward rotation

Pull of the lower fibers

Movement of scapula

Rhomboid (major and minor)Rhomboid (major and minor)

Origin: Ligamentum Origin: Ligamentum nuchea and spinous nuchea and spinous process of C1-7 and 2-5 process of C1-7 and 2-5 TT

Insertion: Medial border Insertion: Medial border of the scapulaof the scapula

Actions: Actions: Adduction of the scapulaAdduction of the scapula Downward rotation of the Downward rotation of the

scapulascapula Elevation of the scapulaElevation of the scapula

SubclaviusSubclavius

Origin: Superior aspect of Origin: Superior aspect of first ribfirst rib

Insertion: Inferior aspect Insertion: Inferior aspect at mid-clavicleat mid-clavicle

ActionAction Depression Depression of the scapulaof the scapula Stabilization Stabilization of the scapulaof the scapula

ScapulaScapula

AdductionAdduction AbductionAbduction Upward Upward RotationRotation

Downward Downward RotationRotation

Trap Trap (middle)(middle)

Pect MinorPect Minor Serratus Serratus Ant.Ant.

Pect MinorPect Minor

Trap Trap (lower)(lower)

Serratus Serratus Ant.Ant.

Trap Trap (middle)(middle)

RhomboidRhomboid

RhomboidsRhomboids Trap Trap (lower)(lower)

Name the muscle.

Rhomboid

Name the action

Adduction of scapula

Name the muscle.

Pectoralis minor

Name the action

Depression of the scapula

Name the muscle.

Trapezius

Name the action

Adduction of the scapula

Name the action

Upward rotation

Name the muscle.

Levator scapula

Name the action

Elevation of the scapula

Name the muscle.

Serratus Anterior

Name the action

Abduction of scapula

? Latissimus Dorsi