Shoulder - glenohumeral joint muscles (medial and lateral rotation)

Question 1

Name the 5 medial rotator muscles of the shoulder and identify where they are located on the human body (if unable check on Complete Anatomy)

Answer 1

Latissimus dorsi
Teres major
Subscapularis
Pectoralis major - clavicular fibres
Clavicular part of deltoid muscle (anterior)

Question 2

What is the origin, insertion and innervation of the latissimus dorsi muscle?

Answer 2

o Origin – Spinous processes of T7-T12 vertebrae, spinous processes of L1-L5 vertebrae via thoracolumbar fascia, 9th-12th ribs, iliac crest
o Insertion – Floor of intertubercular sulcus of humerus
o Innervation – Thoracodorsal nerve (C6-C8)

Question 3

What is the origin, insertion and innervation of the teres major muscle?

Answer 3

o Origin - Posterior aspect of inferior angle of scapula
o Insertion – Crest of lesser tubercle of humerus
o Innervation – Lower subscapular nerve (C5-C7)

Question 4

What is the origin, insertion and innervation of the subscapularis muscle?

Answer 4

o Origin – Subscapular fossa of scapula
o Insertion – Lesser tubercle of humerus
o Innervation – Upper and lower subscapular nerves (C5-C7)

Question 5

What is the origin, insertion and innervation of the pectoralis major muscle?

Answer 5

o Origin – Clavicular head: anterior aspects of medial half of clavicle; Sternocostal head: manubrium, sternal body, the true ribs and their costal cartilages; Abdominal part: external abdominal oblique aponeurosis
o Insertion – Crest of greater tubercle of humerus
o Innervation – Medial and lateral pectoral nerves (C5-T1)

Question 6

What is the origin, insertion and innervation of the clavicular part of deltoid muscle?

Answer 6

o Origin – Lateral one third of clavicle
o Insertion – Deltoid tuberosity of humerus
o Innervation – Axillary nerve (C5-C6)

Question 7

Name the 3 lateral rotator muscles of the shoulder and identify where they are located on the human body (if unable check on Complete Anatomy)

Answer 7

Infraspinatus
Teres minor
Posterior deltoid

Question 8

What is the origin, insertion and innervation of the infraspinatus muscle?

Answer 8

o Origin – Infraspinous fossa of scapula
o Insertion – Greater tubercle of humerus
o Innervation – Suprascapular Nerve (C5-C6)

Question 9

What is the origin, insertion and innervation of the teres major muscle?

Answer 9

o Origin – Posterior aspect of superior half of lateral border of scapula
o Insertion – Greater tubercle of humerus
o Innervation – Axillary nerve (C5-C6)

Question 10

What is the origin, insertion and innervation of the posterior deltoid muscle?

Answer 10

o Origin – Spine of scapula
o Insertion – Deltoid tuberosity of humerus
o Innervation – Axillary nerve (C5-C6)