CH 13: Need to Know Everything Muscles

Question 1

Need to know ID, Origin and Insertion, and Action: Trapezius (2+3+3)

Answer 1

origin: occipital bone and thoracic vertebrae

insertion: acromion and spinous process of scapula, clavicle

action: scapular rotation (elevation/lateral), retraction, stabilize

Question 2

Need to know ID, Origin and Insertion, and Action: Latissmus Dorsi (5+1+3)

Answer 2

origin: inferior thoracic and lumbar vertebrae, inferior scapula,inferior ribs, iliac crest

insertion: intertubercular sulcus

function: arm extension, adduction, medial rotation

Question 3

Need to know ID, Origin and Insertion, and Action: Pectoralis Major

Answer 3

origin: across clavicle and sternum

insertion: intertubercular sulcus

action: assist in medial rotation, arm flexion, adduction

Question 4

Need to know ID, Origin and Insertion, and Action: Serratus Anterior

Answer 4

origin: first 8 ribs

insertion: superior and inferior angles and medial border of scapula

action: moves scapula + rotation and protraction of scapula

Question 5

Need to know ID, Origin and Insertion, and Action: deltoid

Answer 5

origin: scapula (acromion and spine) and clavicle

insert: deltoid tuberosity of humerus

action: abduction of arms

Question 6

Need to know ID, Origin and Insertion, and Action: supraspinatus

Answer 6

origin: supraspinous fossa

insert: greater tubercle of humerus

action: assist in abduction

Question 7

Need to know ID, Origin and Insertion, and Action: teres minor

Answer 7

origin: lateral border of scapula

insert: greater tubercle of humerus

action: assist in lateral rotation of arm

Question 7

Need to know ID, Origin and Insertion, and Action: infraspinatus

Answer 7

origin: infraspinous fossa

insert: greater tubercle of humerus

action: laterally rotate the arm

Question 8

Need to know ID, Origin and Insertion, and Action: teres major

Answer 8

origin: inferior part of scapula

insert: intertubercular sulcus

action: medial rotation of arm and adduction

Question 9

Need to know ID, Origin and Insertion, and Action: triceps

Answer 9

origin: long head on glenoid cavity and medial/lateral on posterior end of humerus

insert: olecranon

action: extension of arm, forearm extensor

Question 10

Need to know ID, Origin and Insertion, and Action: biceps brachii

Answer 10

origin: long head = glenoid cavity and short head = corocoid process of scapula

insert: radial tuberosity

action: arm flexion and primary mover of supination

Question 10

Need to know ID, Origin and Insertion, and Action: subscapularis

Answer 10

origin: subscapular fossa

insert: lesser tubercle

action: rotation of arm

Question 11

Need to know ID, Origin, Insertion, and Action: Iliopsoas

Answer 11

Origin: iliacus - iliac fossa, iliac crest and lateral sacrum

psoas major - lumbar vertebrae

Insertion: lesser trochanter

Action: trunk flexion and thigh flexion

Question 12

Need to know ID, Origin, Insertion, and Action: Gluteus Maximus

Answer 12

Origin: dorsal ilium, sacrum and coccyx

Insertion: gluteal tuberosity

Action: thigh extension

Question 13

Need to know ID, Origin, Insertion, and Action: Sartorius

Answer 13

Origin: ASIS

Insertion: proximal tibia

Action: thigh flexion, abduction, and lateral rotation

Question 14

Need to know ID, origin, insertion, and Action: Adductor Magnus

Answer 14

Origin: pubis and ischium

Insertion: adductor tubercle and linea aspera

Action: thigh flexion, flexion and medial rotation of leg

Question 15

Need to know origin, insertion, and action: Extensor Digitorum Longus

Answer 15

Origin: lateral condyle of tibia and proximal fibula

Insertion: middle and distal phalanges II-IV

Action: toe extension

Question 15

Need to know ID, Origin, Insertion, and Action: Rectus Femoris

Answer 15

Origin: AIIS

Insertion: tibial tuberosity and patella

Action: leg extension and thigh flexion

Question 16

Need to know origin, insertion, and action: Gastrocnemius

Answer 16

Origin: medial femoral condyle and lateral femoral condyle

Insertion: calcaneal tendon

Action: plantar flexion

Question 17

Need to know origin, insertion, and action: Soleus

Answer 17

Origin: proximal tibia and proximal fibula

Insertion: calcaneal tendon

Action: plantar flexion