Ms 4: The Pectoral Girdle

Front 1

Name the joints of the pectoral girdle

Back 1

1. Sternoclavicular
2. Acromioclavicular
3. Glenohumeral
4. Scapulocostal

Front 2

What are the 7 muscles that run from the trunk to the scapula (i.e. no involvement in the arm)?

Back 2

1. Trapezius
2. Serratus anterior
3. Rhomboid major
4. Rhomboid minor
5. Levator scapulae
6. Pectoralis minor

Front 3

Describe the features of trapezius:
1. Origin
2. Insertion
3. Nerve supply
4. Action

Back 3

1. Origin:
- Occiput
- Ligamentum nuchae
- Vertebral spinous processes of C7 to T12
2. Insertion:
- Spine of scapula
- Acromion
- Lateral third clavicle
3. Nerve Supply: Spinal Accessory Nerve CN X1
4. Actions: Elevation, retraction, depression, rotation of scapula (doesn't lift arm)

Front 4

Describe the features of serratus anterior:
1. Origin
2. Insertion
3. Nerve supply
4. Movement

Back 4

1. Origin:
Digitations from upper 8 ribs outer surface
2. Insertion:
Costal surface medial border scapula
3. Nerve Supply:
Long thoracic nerve of Bell C5 ,6 ,7
4. Actions: Protraction of scapula, upward rotation of lateral angle of scapula, holds scapula against chest

Front 5

What is winged scapula?

Back 5

- Usually occurs on damage to the long thoracic nerve C5-7
- Serratus anterior no longer able to work, so scapula not held to thoracic wall
- Patient unable to raise the upper limb fullly or to push with it

Front 6

Describe the features of rhomboid major and minor:
1. Origin
2. Insertion
3. Nerve supply
4. Movement

Back 6

1. Origin:
- Minor spinous processes C7 - T1
- Major spinous processes T2 - T5
2. Insertion: Medial border of scapula
3. Nerve Supply: Dorsal scapular nerve C4,5
4. Action: Retraction

Front 7

Describe the features of levator scapulae:
1. Origin
2. Insertion
3. Nerve supply
4. Movement

Back 7

1. Origin: Transverse processes C1 – C4
2. Insertion: Superior angle
and upper medial border of scapula
3. Nerve Supply: Dorsal scapular nerve C5, small twigs from C3,4
4. Action: Elevation , rotation downwards of scapula

Front 8

Describe the features of pectoralis minor:
1. Origin
2. Insertion
3. Nerve supply
4. Movement

Back 8

1. Origin: Anterior aspect of 3rd – 5th ribs
2. Insertion: Coracoid process of scapula
3. Nerve Supply: Medial pectoral nerve C8,T1
4. Action: Protraction, depression, rotation (downwards) of scapula

NB land mark muscle for the axillary artery