Muscles

Question 1

Frontalis

Answer 1

Origin: cranial aponeurosis
Insertion: skin of eyebrows
Action: raise eyebrows

Question 2

Orbicularis oculi

Answer 2

Origin: frontal bone and maxilla
Insertion: tissue around eyes
Action: blinks and closes eyes

Question 3

Sternocleidomastoid

Answer 3

Origin: sternum and clavicle
Insertion: temporal bone(mastoid process)
Action: Flexes neck,rotates head

Question 4

Pectoralis major

Answer 4

Origin: sternum, clavicle, and first 6 ribs
Insertion: proximal humerus
Action: adducts and flexes humerus

Question 5

Rectus abdominis

Answer 5

Origin: pubis
Insertion: sternum and fifth to seventh ribs
Action: Flexes vertebral column

Question 6

External oblique

Answer 6

Origin: lower eight ribs
Insertion: iliac crest
Action: flexes and rotates vertebral column
runs at a right angle to the internal oblique

Question 7

Internal oblique

Answer 7

Origin: deep to the external iliac crest
Insertion: last 3 ribs
Action: flexes and rotates vertebral column, compresses abdomin
fibers run at a right angle to each other

Question 8

Transverse abdominus

Answer 8

Origin: deepest muscle, lower ribs, and iliac crest
Insertion: pubic bone
Action: compresses abdomen
fibers run horizontally

Question 9

Trapezius

Answer 9

Origin