Muscles of Shoulder Girdle

1
Muscles of Shoulder Girdle

• Chapter 4

2
Movements of the Scapula

• 1. Elevation
• 2. Depression
• 3. Adduction (retraction)
• 4. Abduction (protraction)

5. Downward rotation 6. Upward rotation
3
Anterior Muscles

• Pectoralis Minor
• Serratus Anterior

4
Pectoralis Minor

• Origin Anterior surface of 3, 4, and 5 ribs
• Insertion Coracoid process
• Actions
• Abduction of the scapula
• Downward rotation of the scapula
• Depression of the scapula

5
(No Transcript)
6
Serratus Anterior

• Origin Lateral surface of upper 8 ribs
• Insertion Anterior surface of medial border and
  inferior angle of scapula.
• Actions
• Abduction of the scapula
• Upward Rotation of the scapula

7
(No Transcript)
8
(No Transcript)
9
Posterior Muscles

• Levator Scapluae
• Trapezius
• Rhomboid

10
Levator Scapulae

• Origin Transverse processes of the first 4
  cervical vertebrae.
• Insertion Superior angle and medial border of
  the scapula.
• Actions Elevation of the scapula

11
(No Transcript)
12
Trapezius

• Origin Occipital bone, ligamentum nuchae,
  spinous process of the C7 and all
  Thorasic vertebrae
• Insertion
• 1. Lateral 1/3 of clavicle.
• 2. Top of Acromion process.
• 3. Upper border of spine of the scapula.
• 4. Medial surface of spine of the scapula.

• Actions
• Upper elevation of the scapula
• Middle elevation, upward rotation, adduction
  of the scapula
• Lower depression, AC adduction and upward
  rotation of the scapula

13

• Upper elevation

• Middle elevation, upward rotation, adduction

• Lower depression, adduction and upward rotation

14
Pull of the lower fibers
Movement of scapula
15
(No Transcript)
16
Rhomboid (major and minor)

• Origin Ligamentum nuchea and spinous process of
  C1-7 and 2-5 T
• Insertion Medial border of the scapula
• Actions
• Adduction of the scapula
• Downward rotation of the scapula
• Elevation of the scapula

17
(No Transcript)
18
Subclavius

• Origin Superior aspect of first rib
• Insertion Inferior aspect at mid-clavicle
• Action
• Depression of the scapula
• Stabilization of the scapula

19
(No Transcript)
20
Scapula
Adduction Abduction Upward Rotation Downward Rotation
Trap (middle) Pect Minor Serratus Ant. Pect Minor
Trap (lower) Serratus Ant. Trap (middle) Rhomboid
Rhomboids Trap (lower)
21
Name the muscle.
Rhomboid
Name the action
Adduction of scapula
22
Name the muscle.
Pectoralis minor
Name the action
Depression of the scapula
23
Name the muscle.
Trapezius
Name the action
Adduction of the scapula
Name the action
Upward rotation
24
Name the muscle.
Levator scapula
Name the action
Elevation of the scapula
25
Name the muscle.
Serratus Anterior
Name the action
Abduction of scapula
26
?
Latissimus Dorsi
27
(No Transcript)
28
(No Transcript)
29
(No Transcript)
30
(No Transcript)
31
(No Transcript)