Shoulder Muscles Flashcards Preview

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Flashcards in Shoulder Muscles Deck (9)
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1
Q

Deltoid

A

O: Spine of the scapula, acromion, lateral 1/3 of clavicle

INS: Deltoid tuberosity of humerus

INN: Axillary nerve

ACT: Abducts arm; anterior fibers can flex arm, posterior fibers can extend arm

2
Q

Supraspinatus

A

O: Supraspinous fossa

INS: Greater tubercle of humerus (superior part)

INN: Suprascapular nerve

A: Abducts arm (also responsible for initiating abduction)

3
Q

Infraspinatus

A

O: Infraspinous fossa

INS: Greater tubercle of humerus (middle part)

INN: Suprascapular nerve

A: Laterally rotates arm

4
Q

Teres minor

A

O: Lateral border of scapula (upper half)

INS: Greater tubercle of humerus (inferior part)

INN: Axillary nerve

A: Laterally rotates arm

5
Q

Teres major

A

Lateral border of scapula (lower half and inferior angle)

Anterior side of humerus (medial lip of intertubercular groove)

Lower subscapular nerve

Extends, adducts and medially rotates arm

6
Q

Subscapularis

A

O: Subscapular fossa

INS: Lesser tubercle of humerus

INN: Upper and Lower subscapular nerves

A: Adducts and medially rotates arm

7
Q

Pectoralis major

A

O: Clavicular head: medial ½ of clavicle + Sternocostal head: sternum and adjacent costal cartilages

INS: Anterior side of humerus (lateral lip of intertubercular groove)

INN: Medial and Lateral pectoral nerves

A: Flexes, adducts and medially rotates arm

8
Q

Pectoralis minor

A

O: Ribs 3-5

INS: Coracoid process of scapula

INN: Medial pectoral nerve

A: Depresses scapula and assists with protraction

9
Q

Serratus anterior

A

O: Upper ribs (typically 1-8)

INN: Medial border of the scapula (anterior side)

INS: Long thoracic nerve

A: Protracts and laterally rotates scapula