Lab Practical 2

Question 1

Sternocleidomastoid

Answer 1

Origins: manubrium, clavicle
Insertions: Mastoid process (of temporal bone)
Action: Rotation of neck

Question 2

Pectoralis Major

Answer 2

Origins: clavicle, sternum, and costal cartilages
Insertion: intertubercular sulcus (of humerus)
Action: Flexes the shoulder, adducts shoulder

Question 3

Serratus Anterior

Answer 3

Origins: lateral portion of ribs 1-8
Insertion: Medial border of scapula
Action: Stabilizes scapula

Question 4

Deltoid

Answer 4

Origins: spine of scapula, acromion, clavicle
Insertion: deltoid tuberosity of humerus
Action: Abducts shoulder

Question 5

External Intercostals

Answer 5

Origins: inferior border of rib above
Insertion: superior border of rib below
Action: Elevate rib cage

Question 6

Internal Intercostals

Answer 6

Origins: superior border of rib below
Insertion: inferior border of rib above
Action: Compress rib cage

Question 7

Rectus Abdominis

Answer 7

Origins: pubic crest and symphysis
Insertion: xiphoid process, cartilage of ribs 5-7
Action: Rotates trunk

Question 8

External Oblique

Answer 8

Origins: anterior surface of lower 8 ribs
Insertion: linea alba, pubic crest, iliac crest
Action: Rotates trunk, laterally flexes

Question 9

Trapezius

Answer 9

Origins: occipital bone, spines of C7 & T1-12
Insertion: spine of scapula, acromion, lateral clavicle
Action: Rotates scapula

Question 10

Latissimus Dorsi

Answer 10

Origins: iliac crest; lumbar vertebrae
Insertion: intertubercular sulcus of humerus
Action: Extend shoulder

Question 11

Infraspinatus

Answer 11

Origins: infraspinous fossa of scapula
Insertion: greater tubercle of humerus
Action: Laterally rotates the shoulder

Question 12

Supraspinatus

Answer 12

Origins: supraspinous fossa of scapula
Insertion: greater tubercle of humerus
Action: Abducts shoulder

Question 13

Teres Major

Answer 13

Origins: inferior angle of scapula
Insertion: intertubercular sulcus of humerus
Action: Extends shoulder

Question 14

Rhomboid Major

Answer 14

Origins: spinous processes of C7, T1-T5
Insertion: medial border of scapula
Action: stabilizes scapula

Question 15

Triceps brachii (long head)

Answer 15

Origins: inferior edge of glenoid cavity of scapula
Insertion: olecranon of ulna
Action: extend elbow

Question 16

Triceps Brachii (lateral head)

Answer 16

Origins: posterior proximal humerus
Insertion: olecranon of ulna
Action: elbow extension

Question 17

Biceps Brachii (long head)

Answer 17

Origins: superior edge of glenoid cavity of scapula
Insertion: radial tuberosity
Action: flexes elbow

Question 18

Biceps Brachii (short head)

Answer 18

Origins: coracoid process of scapula
Insertion: radial tuberosity
Action: flexes elbow

Question 19

Brachioradialis

Answer 19

Origins: lateral distal humerus
Insertion: styloid process of radius
Action: flexes elbow

Question 20

Brachialis

Answer 20

Origins: anterior distal humerus
Insertion: coronoid process of ulna
Action: flexes elbow

Question 21

Pronator teres

Answer 21

Origins: medial epicondyle of humerus
Insertion: middle of radius
Action: forearm pronation

Question 22

Flexor Carpi Radialis

Answer 22

Origins: medial epicondyle of humerus
Insertion: base of metacarpals II and III
Action: flexes wrist, abducts wrist

Question 23

Palmaris longus

Answer 23

Origins: medial epicondyle of humerus
Insertion: palmar aponeurosis
Action: flexes wrist

Question 24

Flexor Carpi ulnaris

Answer 24

Origins: medial epicondyle of humerus
Insertion: base of metacarpal V
Action: flex wrist

Question 25

Flexor digitorum superficialis

Answer 25

Origins: medial epicondyle of humerus Insertion: middle phalanges of digits 2-5 Action: flexes fingers

Question 25

Extensor Carpis Radialis longus

Answer 25

Origins: lateral epicondyle of humerus Insertion: base of metacarpal II Action: extends wrist

Question 26

Extensor carpis radialis brevis

Answer 26

Origins: lateral epicondyle of humerus Insertion: base of metacarpal III Action: extends wrist

Question 27

Extensor digitorum

Answer 27

Origins: lateral epicondyle of humerus Insertion: distal phalanges of digits 2-5 Action: extends fingers

Question 28

Extensor Carpi Ulnaris

Answer 28

Origin: lateral epicondyle of humerus Insertion: base of metacarpal V Action: Extends wrist

Question 29

Sartorius

Answer 29

Origin : anterior superior iliac spine Insertion:medial proximal tibia Action: flexes knee

Question 30

Pectineus

Answer 30

Origin : superior pubic ramus Insertion: posterior proximal femur Action:hip adduction

Question 31

Aductor Longus

Answer 31

Origin : pubic symphysis Insertion: linea aspera of femur Action: hip adduction

Question 32

Gracilis

Answer 32

Origin : inferior pubic ramus Insertion: medial proximal tibia Action: hip adduction

Question 33

Rectus Femoris

Answer 33

Origin : anterior inferior iliac spine Insertion: tibial tuberosity Action: extends knee

Question 34

Vastus Lateralis

Answer 34

Origin : greater trochanter of femur Insertion: tibial tuberosity Action: extends knee

Question 35

Vastus Medialis

Answer 35

Origin : interochanteric line of femur Insertion: tibial tuberosity Action: extends knee

Question 35

Vastus Intermedius (underneath rectus femoris)

Answer 35

Origin : anterior proximal femur Insertion: tibial tuberosity Action: extends knee

Question 36

Tensor Fascia Lata

Answer 36

Origin : anterior iliac crest Insertion: iliotibial band Action: stabilizes knee

Question 37

Gluteus Maximus

Answer 37

Origin : posterior ilium, sacrum, coccyx Insertion: gluteal tuberosity of femur Action: extends hip

Question 38

Biceps Femoris Long Head

Answer 38

Origin : ischial tuberosity Insertion: head of fibula, lateral condyle of tibia Action: flexes knee

Question 39

Biceps Femoris Short Head

Answer 39

Origin : linea aspera of femur Insertion: head of fibula, lateral condyle of tibia Action: flexes knee

Question 40

Semitendinosus

Answer 40

Origin : ischial tuberosity Insertion: medial proximal tibia Action: flexes knee

Question 41

Semimembranosus

Answer 41

Origin : ischial tuberosity Insertion: medial condyle of tibia Action: flexes knee

Question 42

Fibularis Longus

Answer 42

Origin : head of fibula Insertion: metatarsal I Action: plantar flexes ankle

Question 43

fibularis brevis (under Longus)

Answer 43

Origin : lateral distal fibula Insertion: Metatarsal V Action: plantar flexes ankle

Question 44

Tibialis Anterior

Answer 44

Origin : anterior proximal tibia Insertion: Metatarsal I Action: dorsiflexes ankle

Question 44

extensor digitorum longus

Answer 44

Origin : Lateral condyle of tibia Insertion: middle & distal phalanges 2-5 (dorsal) Action: extends toes

Question 45

extensor hallucis longus

Answer 45

Origin: anterior shaft of fibula Insertion: distal phalange of hallux Action: extends hallux

Question 46

gastrocnemius - medial head

Answer 46

Origin: medial condyle of femur Insertion: calcaneus Action: plantar flexes ankle

Question 47

gastrocnemius - lateral head

Answer 47

Origin: lateral condyle of femur Insertion: calcaneus Action: plantar flexes ankle

Question 48

soleus

Answer 48

Origin: posterior proximal tibia and fibula Insertion: calcaneus Action: plantar flexes ankle

Question 49

flexor digitorum longus (soleus/gastrocnemius removed)

Answer 49

Origin: posterior shaft of tibia Insertion: distal phalanges 2-5 inferior side Action: flexes toes

Question 50

Tibialis Posterior

Answer 50

Origin: superior posterior tibia and fibula Insertion: inferior tarsals and metatarsals II-V Action: inverts ankle

Question 51

flexor hallucis longus

Answer 51

origin: posterior shaft of fibula insertion: distal phalange of hallux action: flexes hallux, inverts & plantarflexes ankle