Anatomy Week 1

Question 1

which muscles attach the axial skeleton to the proximal humerus

Answer 1

pectoralis major
latissimus dorsi

Question 2

attachments of pectoralis major

Answer 2

A = manubrium and sternal body
upper 6 costal cartilages
external oblique aponeurosis ( sternocostal head)
medial 1/2 of clavicle (clavicular head)

B = lateral lip of the intertubercular sulcus of the humerus

Question 3

attachments of latissimus dorsi

Answer 3

A = T6 to T12 spinous processes
lumbosacral fascia
iliac crest

B = floor of intertubercular groove of the humerus

Question 4

what action does the latissimus dorsi do

Answer 4

able to move inferior angle of the scapula in different directions
internal rotation and adduction

Question 5

what are the attachments of the serratus anterior

Answer 5

A = medial border of the scapula

B = ribs 1-8

Question 6

attachments of the pectoralis minor

Answer 6

A - ribs 3-5

B = coracoid process

Question 7

attachments of the subclavius muscle

Answer 7

A = costochondral joint of the first rib

B = subclavian groove on clavicle

Question 8

attachments of the trapezius

Answer 8

A = nuchal line and ligament, external occipital protuberance and
C7 to T12 spinous processes

B = lateral 1/3 of clavicle posteriorly
= acromion medial border
= superior lip of spine of scapula

Question 9

Rhomboid major attachments

Answer 9

A = T2 to T5 spinous processes

B = medial border of the scapula

lower down than the rhomboid minor

Question 10

action of the rhomboid major and minor

Answer 10

retract the scapula

Question 11

rhomboid minor attachments

Answer 11

A = C7 and T1 spinous processes

B = medial border of the scapula at the spine of it

Question 12

attachments of levator scapulae

Answer 12

A = transverse processes of C1 + C2
= posterior tubercles of C3 + C4

B = medial border of the scapula (superior angle to root of spine)

Question 13

action of levator scapulae

Answer 13

elevate the scapula

Question 14

which muscles directly attach the clavicle or scapula to the axial skeleton

Answer 14

serratus anterior
subclavius
pec minor
trapezius
rhomboid major
rhomboid minor
levator scapulae

Question 15

what muscles come under the category of scapulohumeral

Answer 15

• deltoid
• teres major
• teres minor
• supraspinatus
• infraspinatus
• subscapularis

Question 16

attachments of the deltoid

Answer 16

A = lateral 1/3 of clavicle anteriorly
= lateral border of acromion
= lip of spine of scapula

B = deltoid tuberosity of humerus

Question 17

actions of the deltoid

Answer 17

abduction
flexion and extension

Question 18

attachments of teres major

Answer 18

A = inferior angle of scapula

B = intertubercular sulcus of humerus

Question 19

attachments of supraspinatus

Answer 19

A = medial 2/3 of supraspinous fossa

B = superior facet of greater tubercle of humerus

Question 20

attachments of infraspinatus

Answer 20

A = medial 2/3 of infraspinous fossa

B = central facet of greater tubercle of humerus

Question 21

attachments of teres minor

Answer 21

A = axillary border of the scapula

B = inferior facet of the greater tubercle of humerus

Question 22

attachments of subscapularis

Answer 22

A = medial 2/3 of costal surface of scapula

B = lesser tubercle of humerus

Question 23

action of subscapularis

Answer 23

internal rotation

Question 24

actions of supraspinatus

Answer 24

abduction ( pulls head of humerus medially in towards the glenoid cavity)

Question 25

which muscles externally rotate the shoulder

Answer 25

infraspinatus
teres minor

Question 26

which muscles adduct shoulder

Answer 26

pec major
latissimus dorsi
teres major

Question 27

what are the flexors in the anterior compartment of arm

Answer 27

biceps brachii
brachialis
coracobrachialis

Question 28

muscle in the posterior extensor compartment

Answer 28

triceps brachii

Question 29

attachments of biceps brachii

Answer 29

long head = supraglenoid tubercle of glenoid cavity

short head = coracoid process

B = radial tuberosity

Question 30

where does the short head of the biceps brachii attach

Answer 30

A = coracoid process

B = radial tuberosity

Question 31

attachments of brachialis

Answer 31

A = inferior 1/2 of humerus

B = coronoid process and ulnar tuberosity

Question 32

attachments of coracobrachialis

Answer 32

A = coracoid process

B = medial surface of midshaft of humerus

Question 33

attachment A of long head of triceps

Answer 33

A = infraglenoid tubercle

Question 34

attachment A of lateral head of triceps

Answer 34

A = posterior surface of humerus
superior to radial groove

Question 35

attachment of medial head of triceps brachii

Answer 35

A = posterior surface of humerus inferior to radial groove

Question 36

what is attachment B for long, lateral and medial heads of triceps

Answer 36

olecranon process of ulna

Question 37

actions of biceps brachii

Answer 37

flexor and supinator

Question 38

actions of brachialis

Answer 38

pure flexor

Question 39

actions of coracobrachialis

Answer 39

flexor and adductor

Question 40

what nerve innervates triceps

Answer 40

branches of the radial nerve

Question 41

what nerve innervates the flexor compartment muscles such as the biceps, brachialis and coracobrachialis

Answer 41

musculocutaneous

Question 42

which bone does the biceps attach to in the forearm

Answer 42

radius

Question 43

which bone does the brachialis attach to in the forearm

Answer 43

ulna

Question 44

what nerve innervates deltoid

Answer 44

axillary

Question 45

what nerve innervates serratus anterior

Answer 45

long thoracic nerve

Question 46

what nerve innervates latissimus dorsi

Answer 46

thoracodorsal nerve