Shoulder Muscles

Question 1

Supraspinatus

Answer 1

Origin: Supraspinous fossa of scapula
Insertion: Superior facet of greater tuberosity
Function: Abduction of GH joint
Innervation: Suprascapular nerve

Question 2

Infraspinatus

Answer 2

Origin: Infraspinous fossa
Insertion: Middle facet of greater tuberosity
Function: Lateral & external rotation
Innervation: Suprascapular nerve

Question 3

Teres Minor

Answer 3

Origin: Lateral border of the scapula
Insertion: Inferior facet of greater tuberosity
Function: Lateral & External rotation
Innervation: Axillary nerve

Question 4

Subscapularis

Answer 4

Origin: Subscapular fossa
Insertion: Lesser tuberosity (humeral neck)
Function: Medial & Internal Rotation
Innervation: Subscapular nerve

Question 5

Pectoralis Major

Answer 5

Origin: Anterior surface of the medial half of the clavicle (clavicular head) & Anterior surface of the sternum and rib cartilages 1-6 (Sternocostal head) & Anterior layer of the rectus sheath (abdominal head)
Insertion: The crest of the greater tubercle of the humerus
Function: Adduction and internal rotation of the humerus & anterior/inferior movement of the scapula
Innervation: Medial and lateral pectoral nerves

Question 6

Pectoralis minor

Answer 6

Origin: Rib cartilages 3-5
Insertion: Medial border and the coracoid process of the scapula
Function: anteroinferior movement of the scapula & anchors the scapula to the thoracic cage
Innervation: Medial Pectoral nerve

Question 7

Deltoid

Answer 7

Origin: Lateral third of the clavicle (clavicular) & Acromion of the scapula (acromial) & spine of the scapula (spinal)
Insertion: Deltoid Tuberosity
Function: Flexion & Internal rotation & abduction & extension & lateral rotation
Innervation. Axillary nerve

Question 8

Teres Major

Answer 8

Origin: Inferior angle & lower part of the lateral border of the scapula
Insertion: Medial lip of intertubercular sulcus
Function: Adduction & internal rotation
Innervation: Lower subscapular nerve

Question 9

Rhomboideus Minor

Answer 9

Origin: Spinous process C7 to T1
Insertion: Medial border of the Scapula
Function: Retracts the scapula
Innervation: Dorsal Scapular Nerve

Question 10

Rhomboideus Major

Answer 10

Origin: Spinous Process T2-T5
Insertion: Medial border of the scapula
Function: Retracts the scapula
Innervation: Dorsal Scapula Nerve

Question 11

Serratus Anterior

Answer 11

Origin: Lateral surface of rib 1-9
Insertion: Anterior medial border of scapula
Function: Protraction & upward rotation of scapula
Innervation: Long Thoracic Nerve

Question 12

Bicep Brachii

Answer 12

Origin: (long head) supraglenoid tubercle & GH labrum (short head) coracoid process of scapula
Insertion: Radial tuberosity & Bicipital aponeurosis
Function: Elbow flexion, elbow supination, GH flexion
Innervation: musculocutaneous nerve