Muscles of Shoulder Girdle

Question 1

Sternocleidomastoid

Answer 1

Origin

• Manubrium
• Clavicle

Insertion
- Mastoid Process

Actions
- Head Flexion (A)

Question 2

Trapezius

Answer 2

Origin

• Occipital Bone
• Vertebra Prominens
• Thoracic Vertebrae

Insertion

• Spine of Scapula
• Acromion

Actions

• Elevation (A)
• Depression (A)
• Retraction
• Upward Rotation (A)

Question 3

Levator Scapulae

Answer 3

Origin
- Cervical Vertebrae

Insertion
- Medial Border or Scapula

Actions
- Elevation

Question 4

Rhomboids

Answer 4

Origin
- Thoracic Vertebrae

Insertion
- Medial Border or Scapula

Actions
- Retraction (A)

Question 5

Serratus Anterior

Answer 5

Origin
- Ribs

Insertion
- Medial Border or Scapula

Actions
- Protraction (A)

Question 6

Pectoralis Minor

Answer 6

Origin
- Ribs

Insertion
- Coracoid Process

Actions

• Protraction
• Downward Rotation (A)