Arm

Question 1

Brachial Fascia forms

Answer 1

a sheath for muscles of the arm.

Question 2

Brachial Fascia sends among the muscles

Answer 2

two fibrous septa

• lateral intermuscular septa
• medial intermuscular septa

Question 3

Functions of 2 septa

Answer 3

separates flexor muscles (anterior group) from extensor muscles (posterior group)
provides additional surfaces for muscle attachment

Question 4

Lateral intermuscular septum is attached to

Answer 4

humerus lateral border, lateral supra-condylar ridge down to lateral epicondyle

Question 5

medial intermuscular septum is attached to

Answer 5

thick and attached to humerus medial border and medial supra-condylar ridge down to medial epicondyle

Question 6

Anterior/ventral/flexor muscles

Answer 6

biceps brachii
coraco-brachialis
brachialis muscle

Question 7

biceps brachii muscle origin

Answer 7

2 heads
short- tip of coracoid process on scapula
long - supra glenoid tubercle of scapula

Question 8

biceps brachii insertion

Answer 8

2 head unite to be inserted by:
bicipital tendon: into radial tuberosity
bicipital aponeurosis: into cubital fossa

Question 9

action of biceps brachii

Answer 9

1. powerful supinator when elbow is flexed
2. flexes elbow
3. tendon of long head steadies humerus
4. short head helps in flexion of shoulder joint

Question 10

coraco-brachialis muscle origin

Answer 10

coracoid process (like short head of biceps)

Question 11

coraco-brachialis insertion

Answer 11

rough impression on shaft of humerus

Question 12

coraco-brachialis action

Answer 12

assists in flexion and adduction of shoulder joint

Question 13

relations of coraco-brachialis

Answer 13

pierced by: muscolo-cutaneous nerve

medial to biceps

Question 14

brachialis muscle origin

Answer 14

1. shaft of humerus

2. medial and lateral intermuscular septa

Question 15

insertion of brachialis muscle

Answer 15

coranoid process and ulnar tuberosity

Question 16

action of brachialis muscle

Answer 16

main flexor of elbow

Question 17

triceps origin

Answer 17

3 heads

long: infra glenoid tubercle of scapula
lateral: groove on humerus
medial: shaft of humerus below groove

Question 18

triceps insertion

Answer 18

inserted into olecranon process (near elbow) by tendon

Question 19

triceps nerve supply

Answer 19

radial nerve in axilla gives branches to long and medial head
radial nerve in groove gives branches to lateral and medial head

Question 20

triceps action

Answer 20

1. powerful extensor of elbow joint

2. articularis cubiti draws capsule of elbow doing during extension

Question 21

articularis cubiti

Answer 21

emerge from triceps and insert into fibrous capsule of elbow joint

Question 22

musculo-cutaneous nerve origin

Answer 22

lateral cord of brachial plexus

roots C5,6,7

Question 23

Course of musculo-cutaneous nerve

descends to …

pierces. .
pierces. .
becomes. .

Answer 23

Key words; muscles and lateral

1. descends to axillary artery and brachial artery
2. pierces coraco-brachialis and descends between biceps and brachialis muscles while supplying them
3. pierces deep fascia and becomes superficial called the lateral cutaneous nerve which divides into branches. this supplies the skin of forearm and upper part of thumb

Question 24

branches of musculo-cutaneous nerve & what it supplies

Answer 24

1. muscular branch - coraco-brachialis, biceps and large part of bracialis
2. cutaneous - supplies skin on forearm and skin of thumb

Question 25

radial nerve arrises from

Answer 25

C5,6,7,8 and T1

Question 26

course of radial nerve in the axilla in the arm in front of the lateral epicondyle

Answer 26

in the axilla - descends on wall of axilla in the arm : upper- passes downward of brachial artery, separating it from triceps middle- passes triceps to reach spiral groove lower- pierces lateral intermuscular septum and reaches front of arm where it go between brachialis and brachio-radialis lateral epicondyle - gives branch: posterior interosseous nerve and becomes the superficial radial nerve

Question 27

branches of radial nerve in axilla

Answer 27

muscular : supply long and medial head of triceps | cutaneous : posterior cutaneous nerve : supplies skin on back of arm , from deltoid tuberosity to elblow

Question 28

branches of radial nerve in spiral groove

Answer 28

muscular : to lateral and medial heads of triceps and anconeus cutaneous : lower lateral cutaneous nerve of arm : supplies skin on arm from deltoid tuberosity to elbow

Question 29

branches of the radial nerve in the lower part of the arm

Answer 29

gives muscular branches to brachio-radialis and extensor capri radialis longus and part of brachialis muscle (BBE)

Question 30

terminal branches in front of lateral epicondyle

Answer 30

radial nerve ends by posterior interosseous branch and then continues superficial radial nerve

Question 31

brachial artery beginning

Answer 31

teres major muscle

Question 32

brachial artery is a continuation of

Answer 32

axillary artery

Question 33

course of brachial artery

Answer 33

descends on shaft of humerus passes to front of arm until it descends between lateral and medial epicondyles of humerus enters cubital fossa

Question 34

end of brachial artery

Answer 34

cubital fossa 1 cm below elbow joint

Question 35

what happens at the end of brachial artery?

Answer 35

divides into two terminal branches: radial and ulnar arteries

Question 36

branches of brachial artery

Answer 36

SIMP NT 1. superior ulnar collateral artery 2. inferior ulnar collateral artery 3. muscular branches 4. profunda brachii artery 5. nutrient artery to the humerus 6. terminal branches

Question 37

profunda brachii artery is

Answer 37

the largest and highest branch and descends in spiral groove of humerus with radial nerve

Question 38

muscular branches supply the

Answer 38

biceps, brachialis, coraco-brachialis

Question 39

terminal branches is

Answer 39

radial and ulnar arteries