Shoulder - glenohumeral joint muscles (flexion and extension)

Question 1

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

Answer 1

Clavicular part of deltoid muscle (anterior)
Pectoralis major
Long head of biceps brachii
Short head of biceps brachii
Coracobrachialis

Question 2

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

Answer 2

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

Question 3

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

Answer 3

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 4

What is the origin, insertion and innervation of the long head of biceps brachii muscle?

Answer 4

o Origin – Supraglenoid tubercle of scapula
o Insertion – Radial tuberosity and antebrachial fascia
o Innervation – Musculocutaneous nerve (C5-C6)

Question 5

What is the origin, insertion and innervation of the short head of biceps brachii muscle?

Answer 5

o Origin – Apex of coracoid process of scapula
o Insertion – Radial tuberosity and antebrachial fascia
o Innervation - Musculocutaneous nerve (C5-C6)

Question 6

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

Answer 6

o Origin – Coracoid process of scapula
o Insertion – Middle third of medial aspect of humerus
o Innervation – Musculocutaneous nerve (C5-C7)

Question 7

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

Answer 7

Latissimus dorsi
Scapula spinal part of deltoid muscle (posterior)
Long head of triceps brachii

Question 8

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

Answer 8

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 9

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

Answer 9

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

Question 10

What is the origin, insertion and innervation of the long head of triceps brachii muscle?

Answer 10

o Origin – Infraglenoid tubercle of scapula
o Insertion – Olecranon of ulna and adjacent antebrachial fascia
o Innervation – Radial nerve (C7)