Muscles that move the Gleno-humeral joint

Question 1

Deltoid

A) Origin
B) Insertion
C) Innervation
D) Action

Answer 1

A) Origin: Lateral third of the clavicle
B) Insertion: Deltoid Tuberosity on the lateral aspect of the humerus
C) Innervation: Axillary Nerve
D) Anterior fibres (flexion), middle fibres ( abduction)

Question 2

Supraspinatus

A) Origin
B) Insertion
C) Innervation
D) Action

Answer 2

A) Origin: Supraspinous Fossa of the Scapula
B) Insertion: superior facet of greater tubercle of the humerus
C) Innervation: Suprascapular nerve
D) Action: abduction of the arm 15 degrees

Question 3

Infraspinatus

A) Origin
B) Insertion
C) Innervation
D) Action

Answer 3

A) Origin: Infraspinous Fossa of the Scapula
B) Insertion: middle facet of the greater tubercular of the humerus
C) Innervation: Suprascapular nerve
D) Action: Lateral Rotation

Question 4

Teres Minor

A) Origin
B) Insertion
C) Innervation
D) Action

Answer 4

A) Origin: Posterior Surface of the Scapula, adjacent to its lateral border
B) Insertion: inferior facet of greater tubercle of the humerus
C) Innervation: Axillary Nerve
D) Action: Lateral Rotation of the arm

Question 5

Teres Major

A) Origin
B) Insertion
C) Innervation
D) Action

Answer 5

A) Origin: Posterior Surface of the Inferior Angle of the Scapula
B) Insertion: Intertubercular suclus on the humerus
C) Innervation: Inferior Subscapular Nerve
D) Adduction, Extension at the shoulder joint and Medial Rotation of Arm

Question 6

Subscapularis

A) Origin
B) Insertion
C) Innervation
D) Action

Answer 6

A) Origin: Subscapular Fossa
B) Insertion: Lesser Tubercle of the Humerus
C) Innervation: Upper and Lower Subscapular Nerves
D) Action: Medial Rotation of the Arm

Question 7

Pectoralis Major

A) Origin
B) Insertion
C) Innervation
D) Action

Answer 7

A) Origin: anterior surface of the medial clavicle (Clavicular head), anterior surface of the sternum (Sternocostal head)
B) Intertubercular sulcus of the humerus
C) Innervation: Lateral and medial pectoral nerves
D) Action: Flexion, adduction of the shoulder joint, Medial rotation of the arm

Question 8

Latissimus Dorsi

A) Origin
B) Insertion
C) Innervation
D) Action

Answer 8

A) Origin: Illiac Crest
B) Insertion: Intertubercular sulcus
C) Innervation: Thoracodorsal Nerve
D) Action: Extension, adduction