Scapular and Subscapular Regions

Question 1

Supraspinatus

Answer 1

O: Supraspinous fossa of scapula
I: Superior facet of greater tubercle of humerus
N: Suprascapular Nerve C5, C6
A: 1. Initiates and assists deltoid in ABduction of arm
2. Acts with rotator cuff muscles

Question 2

Infraspinatus

Answer 2

O:  Infraspinous fossa of scapula
I:  Middle facet of greater tubercle of humerus
N: Subrascapular Nerve C5, C6
A: 1.  Laterally Rotates Arm
    2.  Acts with rotator cuff muscles

Question 3

Teres Minor

Answer 3

O: Middle part of lateral border of scapula
I: Inferior facet of greater tubercle of humerus
N: Axillary Nerve C5, C6
A: 1. Laterally Rotates Arm
2. Acts with rotator cuff muscles

Question 4

Subscapularis

Answer 4

O:  Subscapular fossa
I:  Lesser Tubercle of Humerus
N:  1.  Upper Subscapular Nerve
     2.  Lower Subscapular Nerve
A:  1.  Medially rotate arm
     2.  As part of rotator cuff, help hold head of humerus in glenoid cavity

Question 5

Teres Major

Answer 5

O: Posterior surface of inferior angle of scapula
I: Medial lip of intertubercular sulcus of humerus
N: Lower Subscapular Nerve
A: 1. Adducts arm
2. Medially rotates arm

Question 6

Latissimus Dorsi

Answer 6

O: 1. Spinous processes of inferior 6 thoracic vertebrae
2. Thoracolumbar fascia
3. Iliac crest
4. Inferior 3 or 4 ribs
I: Floor of inter tubercular sulcus of humerus
N: Thoracodorsal Nerve C6, C7, C8
A: 1. Extends Humerus
2. Adducts Humerus
3. Medially rotates Humerus
4. Raises body towards arms when climbing

Question 7

Pectoralis Major

Answer 7

O: 1. Clavicular Head: Anterior surface of medial half of clavicle
2. Sternocostal Head
a. Anterior surface of sternum
b. Superior 6 costal cartilages
c. Aponeurosis of external oblique muscle
I: Lateral lip of intertubercular sulcus of humerus
N: 1. Lateral Pectoral Nerve
2. Medial Pectoral Nerve
C5, C6, C7, C8, T1
A: 1. Adduct Humerus
2. Medially Rotate Humerus
3. Draws scapula anteriorly and inferiorly
4. Clavicular Head (Acting Alone)– Flexes humerus
5. Sternocostal Head (Acting Alone)- Extends humerus from flexed position

Question 8

Triceps Brachii

Answer 8

O: Long Head: Infraglenoid tubercle of scapula
Lateral Head: Posterior Surface of humerus, superior to radial groove
Medial Head: Posterior surface of humerus, inferior to radial groove
I: 1. Proximal end of olecrenaon of ulna
2. Fascia of Forearm
N: Radial Nerve C6, C7, C8
A: 1. Chief extensor of forearm
2. Long head resists dislocation of humerus, especially important during abduction