Muscle Actions - Posterior

Question 1

Erector Spinae

Area -

Origin -

Insertion -

Actions -

Answer 1

Area - Both sides of spine

Origin - Vertebrae, ribs, illium, ischium, pubis, sacrum

Insertion - occipital bone, temporal bone, Vertebrae, ribs

Actions - Extension, Lateral flexion and rotation of spine

Question 2

Trapezius

Area -

Origin -

Insertion -

Actions -

Answer 2

Area - upper back

Origin - base of skull, cervical and thoracic vertebrae

Insertion - capula

Actions - elevation, depression and retraction of shoulder girdle

Question 3

Triceps Brachii

Area -

Origin -

Insertion -

Actions -

Answer 3

Area - back of upper arm

Origin - humerus, scapula

Insertion - ulna

Actions - Extension of elbow, Extension of shoulder

Question 4

Rhomboids

Area -

Origin -

Insertion -

Actions -

Answer 4

Area - upper back beneath Trapezius

Origin - upper thoracic vertebrae

Insertion - scapula

Actions - retraction of shoulder girdle

Question 5

Latissimus Dorsi

Area -

Origin -

Insertion -

Actions -

Answer 5

Area - sides of the back

Origin - thoracic and lumbar vertebrae, sacrum, illium, ribs

Insertion - humerus

Actions - Extension, adduction and medial rotation of shoulder

Question 6

Gluteus Maximus

Area -

Origin -

Insertion -

Actions -

Answer 6

Area - bottom

Origin - illium, sacrum, coccyx

Insertion - femur

Actions - Extension and Lateral Rotation of hip

Question 7

Hamstrings

Area -

Origin -

Insertion -

Actions -

Answer 7

Area - back of thigh

Origin - ischium, femur

Insertion - tibia, fibia

Actions - Extension of hip, flexion of knee

Question 8

Gastrocnemius

Area -

Origin -

Insertion -

Actions -

Answer 8

Area - back of lower leg

Origin - tibia, fibia

Insertion - heel bone (calcenus)

Actions - flexion of knee, plantar flexion of ankle

Question 9

Soleus

Area -

Origin -

Insertion -

Actions -

Answer 9

Area - back of Lower leg beneath gastrocnemius

Origin - tibia, fibia

Insertion - heel bone (calcenus)

Actions - plantar flexion of ankle