Ch. 12 Skeletal Muscle Gross Anatomy

Question 1

Erector spinal (back)

Answer 1

origin: iliac crest, transverse processes of cervical, thoracic, and lumbar vertebrae, and ribs 3-6
insertion: ribs and transverse processes of vertebrae, 6 segments above origin

Question 2

Quadratus lumborum (posterior body wall)

Answer 2

origin: iliac crest and lumbar fascia
insertion: transverse processes of L1-L4 and 12th rib

Question 3

Pectoralis major

Answer 3

origin: clavicle, sternum, cartilage of ribs 2-6
insertion: fibers form short tendon that inserts into intertubercular groove of humerus

Question 4

Deltoid (shoulder)

Answer 4

origin: acromion and spine of scapula, lateral third of clavicle
insertion: deltoid tuberosity of humerus

Question 5

Serratus anterior (rib cage)

Answer 5

origin: ribs 1-8
insertion: vertebral border of scapula

Question 6

Coracobrachialis

Answer 6

origin: coracoid process of scapula
insertion: shaft of humerus

Question 7

Pectoralis major

Answer 7

origin: ribs 3-5
insertion: coracoid process of scapula

Question 8

Levator scapulae

Answer 8

origin: transverse processes of first 4 cervical vertebrae
insertion: vertical border of scapula

Question 9

Trapezius

Answer 9

origin: occipital bone, ligaments niche, spines of C7-T12
insertion: acromion and spinous process of scapula, lateral third of clavicle

Question 10

Latissimus dorsi

Answer 10

origin: spinous processes of lower thoracic and all lumbar vertebrae, ribs 8-12 and jumbo