OIAN for the final

Question 1

levator labii

Answer 1

O: zygomatic, lacrimal, and superioris maxillary bones

I: upper lip

A: raise upper lip

N: facial n.

Question 2

buccinator

Answer 2

O: maxilla, and mandible

I: commissure of mouth

A: retract the commissure of the mouth and flatten the cheeks

N: facial n.

Question 3

masseter

Answer 3

O: facial crest and zygomatic arch

I: ramus of mandible

A: close the mouth

N: trigeminal (mandibular)

Question 4

occipitomandibularis

Answer 4

O: jugular process of occipital bone

I: caudal bordr of mandible

A: open the mouth

N: facial n.

Question 5

cricoarytenoideus dorsalis

Answer 5

O: lamina of cricoid cartilage

I: arytenoid cartilage, muscular process

A: open the glottis

N: recurrent laryngeal n.

Question 6

cricoarytenoideus lateralis

Answer 6

O: arch of cricoid cartilage

I: arytenoid cartilage (muscular process)

A: close the glottis

N: recurrent laryngeal n.

Question 7

supraspinatus

Answer 7

O: supraspinous fossa and spine of scapula

I: greater and lesser tubercles of humerus

A: extend the shoulder, cranial shoulder stabilizer

N: suprascapular n.

Question 8

infraspinatus

Answer 8

O: infraspinatus fossa

I: greater tubercle of the humerus

A: abduct the arm (acts as a lateral collateral ligament of hte shoulder joint)

N: suprascapular n.

Question 9

deltoideus

Answer 9

O: spine of scapula and aponeurosis over infraspinatus muscle

I: deltoid tuberosity

A: flex the shoulder and abduct the arm

N: axillary n.

Question 10

subscapularis

Answer 10

O: subscapular fossa

I: lesser tubercle of humerus

A: adduct the humerus, medial shoulder stabilizer

N: subscapular and axillary nn.

Question 11

biceps brachii

Answer 11

O: supraglenoid tubercle

I: radial tuberoisty and tendon of extensor carpi radialis via lacertus fibrosus

A: flex the elbow, extend the shoulder and carpus

N: musculocutaneous n. (proximal branch)

Question 12

triceps brachii: long head

Answer 12

O: caudal border of the scapula

I: olecranon

A: extend the elbow and flex the shoulder

N: radial n.

Question 13

triceps brachii: lateral head

Answer 13

O: lateral surface of humerus

I: olecranon

A: extend the elbow

N: radial n.

Question 14

triceps brachii: medial head

Answer 14

O: medial surface of humerus

I: olecranon

A: extend the elbow

N: radial n.

Question 15

extensor carpii radialis

Answer 15

O: lateral epicondyle of humerus

I: metacarpal tuberosity MC 3

A: extend the carpus and flex the elbow

N: radial n.

Question 16

ulnaris lateralis

Answer 16

O: lateral epicondyle of humerus

I: accessory carpal bone C4 and MC 4

A: flex the carpus and extend the elbow

N: radial n.

Question 17

common digital extensor

Answer 17

O: lateral epicondyle of humerus, lateral tuberosity of radius, lateral surface of body of the ulna

I: extensor process of third phalanx

A: extend the digit and carpus, but flex the elbow

N: radial n.

Question 18

flexor carpi radialis

Answer 18

O: medial epicondyle of humerus

I: second metacarpal bone

A: flex the carpus and extend the elbow

N: median n.

Question 19

superficial digital flexor

Answer 19

O: medial epicondyle of humerus and caudal surface of radius

I: proximal part of second phalanx and distal part of first phalanx

A: flex the digit and carpus and extend the elbow

N: ulnar n.

Question 20

deep digital flexor

Answer 20

O: medial epicondyle of the humerus, olecranon, caudal surface of the radius

I: flexor surface of third phalanx

A: flex the digit and carpus and extend the elbow

N: median and ulnar nn.

Question 21

interosseus (suspensory ligament)

Answer 21

O: palmar surface of third metacarpal bone and distal row of carpal bones

I: abaxial surfaces of proximal sesmoids and tendon of common digital extensor m.

A: support the fetlock (prevent overextension)

N: palmar metacarpal nn. (sensory only)