Shoulder - muscles (protraction and retraction of scapula)

Question 1

Name the 2 scapula protractor muscles and identify where they are located on the human body (if unable check on Complete Anatomy)

Answer 1

Pectoralis minor
Serratus anterior

Question 2

What is the origin, insertion and innervation of the pectoralis minor?

Answer 2

o Origin – Anterior ends of 3rd-5th ribs
o Insertion – Coracoid process of scapula
o Innervation – Medial and lateral pectoral nerves (C5-T1)

Question 3

What is the origin, insertion and innervation of the serratus anterior?

Answer 3

o Origin – External surfaces of 1st-9th ribs
o Insertion – Medial border of scapula
o Innervation – Long thoracic nerve (C5-C7)

Question 4

Name the 2 scapula retractor muscles and identify where they are located on the human body (if unable check on Complete Anatomy)

Answer 4

Trapezius
Latissimus dorsi
Other contributing muscles are rhomboid major and rhomboid minor

Question 5

What is the origin, insertion and innervation of the descending part of trapezius?

Answer 5

 Origin – External occipital protuberance and superior nuchal line of occipital boke, nuchal ligament, spinous process of C7 vertebra
 Insertion – Posterior aspect of lateral one third of clavicle, acromion of scapula
 Innervation – Accessory nerve, anterior rami of 3rd and 4th cervical nerves

Question 6

What is the origin, insertion and innervation of the transverse part of trapezius?

Answer 6

 Origin – Spinous process of C7-T4 vertebrae
 Insertion – Acromion of scapula, lateral end of spine of scapula
 Innervation – Accessory nerve, anterior rami of 3rd and 4th cervical nerves

Question 7

What is the origin, insertion and innervation of the ascending part of trapezius?

Answer 7

 Origin – Spinous processes of T5-T12 vertebrae
 Insertion – Medial end of spine of scapula
 Innervation – Accessory nerve, anterior rami of 3rd and 4th cervical nerves

Question 8

What is the origin, insertion and innervation of the serratus anterior?

Answer 8

o Origin – External surfaces of 1st-9th ribs
o Insertion – Medial border of scapula
o Innervation – Long thoracic nerve (C5-C7)