Muscular System Pt. 3

Question 1

Origin for Trapezius

Answer 1

Nuchal Ligament, Spinous processes (C7-T12) and Occipital Bone

Question 2

Insertion of Trapezius

Answer 2

Clavicle, Acromion process, Spine of scapula

Question 3

Actions of Trapezius

Actions means when the insertion moves closer to origin

Answer 3

Elevate scapula, adduction of scapula, upward rotation of scapula and depression of scapula

Question 4

Origin of Rhomboid Minor and Major

Deep to trapezius

Answer 4

Spinous processes of C7-T5

Minor is on C7-T1 and Major is T2-T5

Question 5

Insertion of Rhomboid Minor and Major

Answer 5

Medial border of scapula

Minor is superior to major

Question 6

Actions of Minor and Major Rhomboids

Actions means when the insertion moves closer to origin

Answer 6

• Retraction of scapula
• Elevation of scapula
• Downward rotation of scapula

Question 7

Levator Scapulae Origin

Levator means elevates

Answer 7

C1-C4 transverse processes

Question 8

Insertion of Levator Scapulae

Answer 8

Superior medial border of scapula

Question 9

Actions of Levator Scapulae

Similar as Rhomboids

Answer 9

Scapula elevation & Downward Rotation of scapula

Question 10

Origin of Latissimus Dorsi

Answer 10

• Posterior Sacrum
• Lower thoracic vertebrae
• Lumbar vertebrae

Question 11

Insertion of Latissimus Dorsi

Answer 11

Bicipital Groove of humerus

Question 12

Actions of Latissimus Dorsi

Answer 12

• Extension of arm at shoulder
• Medial rotation of humerus
• Adduction of humerus

Question 13

Origin of Serratus Anterior

Answer 13

Originates from Ribs 1-9

Question 14

Insertion of Serratus Anterior

Same insertion as Rhomboids

Answer 14

Medial border of scapula; anterior surface

Question 15

Actions of Serratus Anterior

Answer 15

• Abduction of scapula (away from spine)
• Upward rotation of scapula

Question 16

Origin of Pectoralis Minor

Superficial to serratus anterior

Answer 16

Ribs 2-5

Question 17

Insertion of Pectoralis Minor

Answer 17

Coracoid process on scapula

Question 18

Actions of Pectoralis Minor

Answer 18

• Weak shoulder protraction (serratus anterior is the prime mover while pec. minor is synergist)
• Downward rotation of scapula

Question 19

Origin of Pectoralis Major

Answer 19

Medial clavicle & Costal cartilage of ribs 1-6

Question 20

Insertion of Pectoralis Major

Same as Lattisimus Dorsi

Answer 20

Biciptal groove of humerus

Question 21

Actions of Pectoralis Major

Answer 21

• Flexion of arm at shoulder
• Extension of flexed arm
• Medial rotation of humerus
• Adduction of humerus

Question 22

Origin of Sternocleidomastoid

Answer 22

Manubrium of Sternum; Medial 1/3 of Clavicle

Question 23

Insertion of Sternocleidomastoid

Answer 23

• Mastoid process of temporal bone
• Lateral 1/2 of superior nuchal line of occipital bone

Question 24

Action of Sternocleidomastoid

Answer 24

• Bilateral - Neck Flexion (tipping towards chest)
• Unilateral - Lateral rotation and lateral flexion of neck

Question 25

Origin of Erector Spinae Muscle

Answer 25

• Illiac crest
• Sacrum
• Lumbar spinous processes
• T11-T12 spinous processes

This muscle allows us to stand up straight and walk on two feet
Consists of illiocostlis, longissimus and spinalis muscles

Question 26

Insertion of Erector Spinae Muscle

Answer 26

• Ribs
• Spinous & transverse processes of cervical and thoracic

Question 27

Actions of Erector Spinae Muscle

Answer 27

• Back extension - bilateral
• Lateral flexion of back - unilateral