Lab Practical 2

Question 1

Anconeus

Answer 1

O: lateral epicondyle of humerus
I: olecranon process and posterior ulna
A: extension of elbow

Question 2

Biceps brachii

Answer 2

O: long: supraglenoid tubercl
Short: coracoid process of scapula
I: tuberosity of radius, apeneurosis of biceps
A: flex elbow, supinate forearm, flex shoulder

Question 3

Brachialis

Answer 3

O: distal half of anterior humerus
I: tuberosity & coranoid process of ulna
A: flex elbow

Question 4

Brachioradialis

Answer 4

O: proximal 2/3 of lateral supracondylar ridge of humerus
I: styloid process of radius
A: flex elbow, assist pronation/supination when resisted

Question 5

Coracobrachialis

Answer 5

O: coracoid process of scapula
I: medial surface of mid-humeral shaft
A: flex, adduct shoulder

Question 6

Deltoid

Answer 6

O: lateral 1/3 clavicle, acromion, spine of scapula
I: deltoid tuberosity
A: abduct shoulder
Anterior fibers: flex, lateral rotation, horizontal abduct shoulder
Posterior fibers: ext, lateral rotation, horizontal abduct shoulder

Question 7

Latissimus dorsi

Answer 7

O: inferior angle of scapula, t6, last 3/4 ribs, iliac crest
I: intertubular groove humerus
A: ext, add, medial rotate shoulder

Question 8

Infraspinatus

Answer 8

O: infraspinatus fossa of scapula
I: greater tubercle of humerus
A: lateral rotation, adduct shoulder, stabilize humerus in glenoid fossa

Question 9

Pectoralis major

Answer 9

O: median half of clavicle, sternum, ribs 1-6
I: lateral lip of bicipital groove of humerus
A: All: adduct, medial rotate shoulder, elevate thorax during breathing
Upper: flex, horizontal adduct shoulder
Lower: extend shoulder

Question 10

Pectoralis minor

Answer 10

O: ribs 3-5
I: coracoid process
A: depresses scapula, abduct scapula! downward rotation of scapula

Question 11

Pronator Teres

Answer 11

O: common flex tendon medial epicondyle of humerus & coronoid process of ulna
I: mid lateral surface of radius
A: pronate forearm, assist elbow in flexion

Question 12

Pronator Quadratus

Answer 12

O:medial, anterior surface distal ulna
I: lateral, anterior surface distal radius
A: pronate forearm

Question 13

Rhomboids

Answer 13

O: minor: c7-t1
Major: t2-t5
I: minor: upper medial border scapula-across from spine of scapula
Major: medial border of scapula-between spine of scapula and inferior angle
A: adduct, elevate, down rotate scapula

Question 14

Serratus Anterior

Answer 14

O: ext surfaces upper 8-9 ribs
I: anterior surface, medial border of scapula
A: abduct, upward rotate, depress scapula and hold medial border of scapula against ribs

Question 15

Subscapularis

Answer 15

O: subscapular fossa of scapula
I: lesser tubercle humerus
A: abduct, upward rotate, depress scapula & hold medial border of scapula against ribs

Question 16

Supinator

Answer 16

O: lateral epicondyle of humerus
I: anterior, lateral surface of proximal 1/3 of radial shaft
A: supinate forearm

Question 17

Supraspinatus

Answer 17

O:supraspinous fossa of scapula
I: gr tubercle of humerus
A: abduct shoulder, stabilize head of humerus in glenoid fossa

Question 18

Teres Minor

Answer 18

O: upper 2/3 lateral border scapula
I: gr tubercle of humerus
A: lateral rotate,adduct shoulder, stabilize humerus

Question 19

Teres Major

Answer 19

O: inferior angle/lower 1/3 lateral border scapula
I: crest lesser tubercle humerus
A: extension, adduct, medial rotate shoulder

Question 20

Trapezius

Answer 20

O: occipital protuberance, nuchal line of occiput, c7-t12
I: lateral 1/3 scapula
A: bilaterally: ext neck/head
Unilaterally: lat flex, rotate, elevate, up rotate head/neck
Middle fibers: adduct, stabilize scapula
Lower fibers: depress, up rotate scapula

Question 21

Triceps Brachii

Answer 21

O: long: infraglenoid tubercle of scapula
Lateral head: posterior surface proximal half of humerus
Medial head: posterior surface distal half humerus
I: olecranon process of ulna
A: all: extension of elbow
Long: extension, adduct shoulder