Scapular Muscles Flashcards
1
Q
Origin of the Deltoid
A
- Anterior: Clavicular portion from clavicle
- Middle: Acromial portion from scapula
- Posterior: Spinous portion from scapula
2
Q
Insertion of the Deltoid
A
- Deltoid tuberosity/humerus
3
Q
Action of the Deltoid
A
- Anterior: Flexes and medially rotates humerus
- Middle: Abducts humerus
- Posterior: Extends and laterally rotates humerus
4
Q
Nerve supply of the Deltoid
A
- Axillary nerve
5
Q
Origin of the Supraspinatus
A
- Supraspinatus fossa/scapula
6
Q
Insertion of the Supraspinatus
A
- Greater tuberosity/humerus
7
Q
Action of the Supraspinatus
A
- Initiates abduction of the humerus
- Helps laterally rotates humerus
- Helps stabilize humerus
8
Q
Nerve supply of the Supraspinatus
A
- Suprascapular nerve
9
Q
Origin of the Infraspinatus
A
- Infraspinatus fossa/humerus
10
Q
Insertion of the Infraspinatus
A
- Greater tuberosity/humerus
11
Q
Action of the Infraspinatus
A
- Laterally rotates humerus
- Stabilizes scapula
12
Q
Nerve suppy of the Infraspinatus
A
- Suprascapular nerve
13
Q
Origin of the Subscapularis
A
- Subscapular fossa/scapula
14
Q
Insertion of the Subscapularis
A
- Lesser tuberosity/humerus
15
Q
Action of the Subscapularis
A
- Stabilization of the shoulder joint
- Medially rotates humerus
