The Brachium

Question 1

Anterior arm musculature

Answer 1

Coracobrachialis
biceps brachii (long and short head)
brachialis

Question 2

Anterior arm muscles are innervated by

and the lateral surface of the skin of the forearm:

Answer 2

the musculocutaneous nerve

Question 3

Coracobrachialis

origin

Answer 3

apex of the coracoid process of the scapula

Question 4

Coracobrachialis

insertion

Answer 4

humerus

in line with crest of lesser tuberocity; linear roughening on midshaft of humerus on medial side

Question 5

Coracobrachialis

innervation

Answer 5

musculocutaneous

C5 C6 C7

Question 6

Coracobrachialis

action

Answer 6

flexion at GH joint
aDduction
internal rotation

Question 7

Biceps Brachii

origin

Answer 7

long head- supraglenoid tubercle of scapula

short head- coracoid process of scapula

Question 8

Biceps Brachii

insertion

Answer 8

radial tuberocity

Question 9

Biceps Brachii

innervation

Answer 9

musculocutaneous nerve

C5 C6 C7

Question 10

Biceps Brachii

action

Answer 10

elbow joint- flexion of forearm
supination (when elbow is flexed, biceps is a powerful supinator)

shoulder joint- flexion
stabilization of humeral head during deltoid contraction
aBduction and internal rotation of humerus

accessory flexor of the arm at the GH joint

Question 11

Brachialis

origin

Answer 11

distal half of anterior surface of humerus

anterior aspec of humerus-medial and lateral surfaces- and adjacent internmuscular septa

Question 12

Brachialis

insertion

Answer 12

ulnar tuberosity

Question 13

Brachialis

innervation

Answer 13

musculocutaneous nerve
C5 C6 C7
small contribution by the radial nerve C7 to lateral part of the muscle

Question 14

Brachialis

action

Answer 14

flexion at the elbow joint

Question 15

Posterior Arm Musculature

Answer 15

Triceps (long, medial, lateral heads)

Anconeus

Question 16

All posterior muscles are innervated by:

Answer 16

the radial nerve

C5-T1

Question 17

Tricpes

origin

Answer 17

1. Long head- infraglenoid tubercle of scapula
2. Medial head- posterior humerus inferior to radial groove & medial intermuscular septum
3. Lateral head- posterior humerus proximal to radial groove & lateral intermuscular septum

Question 18

Triceps

insertion

Answer 18

olecranon of ulna

Question 19

Triceps

innervation

Answer 19

radial nerve

C5-T1

Question 20

Triceps

action

Answer 20

elbow joint- extension

shoulder joint- long head extension and ADduction

Question 21

Ancneous

origin

Answer 21

lateral epicondyle of humerus

variance: posterior joint capsule

Question 22

Ancneous

insertion

Answer 22

olecranon of ulna (radial surface)

proximal surface of ulna

Question 23

Ancneous

innervation

Answer 23

radial nerve
C6 C7 C8
via branch to medial head of triceps brachii

Question 24

Ancneous

action

Answer 24

extends the elbow and tightens the joint
ADduction of the ulna in pronation
accessory extensor of the elbow joint

Question 25

The path of the musculocutaenous nerve

Answer 25

leaves the axilla enters the arm through the coracobrachialis diagonally down the arm deep to biceps, superficially to the brachial is gives rise to motor branches emerges laterally to the tendon of the biceps at the elbow continues at the lateral cutaneous nerve of the forearm

Question 26

Brachial artery

Answer 26

become the brachial artery after the axillary artery crosses the lower border of the teres MAJOR muscle terminates just distal to the elbow joint where it divides into the radial and ulnar arteries proximally it lies medial side distal: it moves laterally to lie in the middle of the medial and lateral epicondyle of the humerus medial to the tendon of the biceps

Question 27

largest branch of the brachial artery:

Answer 27

profunda brachii artery

Question 28

profunda brachii artey

Answer 28

supplies the posterior compartment of the arm | it runs with the radial nerve

Question 29

Veins in the arm

Answer 29

paired brachial veins cephalic vein basilic vein

Question 30

Paired brachial vein

Answer 30

passes along the medial and lateral sides of the branches of the brachial artery

Question 31

cephalic vein

Answer 31

lateral side of arm

Question 32

basilic vein

Answer 32

medial side of arm

Question 33

All posterior muscles are innervated by:

Answer 33

Radial nerve | C5-T1

Question 34

profunda brachia artery

Answer 34

triceps

Question 35

superior throacic artery

Answer 35

look up

Question 36

thoracoacromial artery

Answer 36

look up

Question 37

lateral thoracoacromial artery

Answer 37

look up

Question 38

subscapular artery

Answer 38

look up

Question 39

anterior humeral circumflex artery

Answer 39

look up

Question 40

posterior humeral circumflex artery

Answer 40

look up