OIAN quiz 2

Question 1

Gluteus Medius

Answer 1

O: dorsal ilium between anterior & inferior gluteal lines

I: superior border of greater trochanter of femur

A: abducts & medially rotates thigh

N: superior gluteal nerve

Question 2

Infraspinatus

Answer 2

O: infraspinous fossa of scapula

I: greater tubercle of humerus, posterior to supraspinatus

A: ~helps to hold head of humerus in glenoid cavity
~stabilizes the shoulder joint
~rotates humerus laterally

N: suprascapular nerve

Question 3

Pectoralis Major

Answer 3

O: sternal end of clavical, sternum, cartilage of ribs 1-6, & aponeurosis of external oblique muscle

I: by a short tendon into intertubercular groove of humerus

A: ~agonist of arm flexion
~rotates arm medially
~adducts arm against resistance
~ pulls rib cage upward with scapula fixed

N: lateral & medial pectoral nerves

Question 4

Pectoralis Minor

Answer 4

O: anterior surface of ribs 3-5 (or 2-4)

I: coracoid process of scapula

A: ~draws scapula forward & downward (ribs fixed)
~draws rib cage superiorly (scapula fixed)

N: both pectoral nerves

Question 5

Serratus anterior (boxer’s muscle)

Answer 5

O: by series of muscle slips from ribs 1-9

I: anterior surface of vertebral border of scapula

A: ~agonist to protract & hold scapula against ribcase
~rotates scapula (inferior angle laterally & upward)
~abduct & raise arm & horizontal arm movements

N: long thoracic nerve

Question 6

Subscapularis

Answer 6

O: Subscapular fossa of scapula

I: lesser tubercle of humerus

A: ~chief medial rotator of humerus, asisted by pectoralis major
~helps to hold head of humerus in glenoid cavity, stablizes shoulder

N: subscapular nerve

Question 7

Tensor Fasciae Latae

Answer 7

O: anterior iliac crest & anterior superior iliac spine

I: iliotibial tract

A: ~flexes & abducts thigh (synergist of iliopsoas & gluteus muscles)
~rotates thigh medially
~ steadies the trunk by pulling iliiotibial tract taut (locking the knee)

N: superior gluteal nerve

Question 8

HAmstring

Semitendinosus

Answer 8

O: ischial tuberosity

I: medial surface of tibia

A:

N: tibial

Question 9

Hamstring

Semimembranosus

Answer 9

O: ischial tuberosity

I: medial tibial condyle

N: tibial

Question 10

Hamstring

Biceps femoris long head

Answer 10

O: ischial tuberosity

I: lateral side of the head of the fibula

N: tibial

Question 11

Hamstring

Biceps femoris short head

Answer 11

O: linea aspera and lateral supracondylar line of femur

I: lateral side of the head of the fibula

N: common peroneal