Week 7 Arm

Question 1

deep fasica of forearm

Answer 1

• brachial fascia
• medial and lateral intermuscular septa:
  anterior (flexor) compartment
  posterior (extensor) compartment

see diagram as well

Question 2

what are the two heads of biceps brachii

Answer 2

short and long head

Question 3

proximal and distal attachment of biceps brachii (short head)

Answer 3

proximal:
tip of coracoid process of scapula

distal:
tuberosity of radius and fascia of forearm via bicipital aponeurosis

Question 4

innervation of biceps brachii (short head)

Answer 4

musculocutaneous nerve

Question 5

proximal and distal attachment of biceps brachii (long head)

Answer 5

proximal:
supraglenoid tubercle of scapula

distal:
tuberosity of radius and fascia of forearm via bicipital aponeurosis

Question 6

innervation of biceps brachii (long head)

Answer 6

musculocutaneous nerve

Question 7

main action of biceps brachii (short, long head)

Answer 7

• supinates forearm
• flexes forearm when it is supine
• short head resists dislocation of shoulder

Question 8

proximal and distal attachment of coracobrachialis

Answer 8

proximal:
tip of coracoid process of scapula

distal:
middle third of medial surface of humerus

Question 9

innervation of coracobrachialis

Answer 9

musculocutaneous nerve

Question 10

main action of coracobrachialis

Answer 10

• flexes and adducts arm
• resists dislocation of shoulder

Question 11

proximal and distal attachment of brachialis

Answer 11

proximal:
distal half of anterior surface of humerus

distal:
coronoid process and tuberosity ulna

Question 12

innervation of brachialis

Answer 12

• musculocutaneous nerve
• radial nerve

Question 13

main action of brachialis

Answer 13

flexes forearm in all positions

Question 14

what are three heads of triceps brachii

Answer 14

long, lateral, medial head

Question 15

proximal attachment of triceps brachii (long head)

Answer 15

infraglenoid tubercle of scapula

Question 16

proximal attachment of triceps brachii (lateral head)

Answer 16

• posterior surface of humerus
• superior to radial groove

Question 17

proximal attachment of triceps brachii (medial head)

Answer 17

• posterior surface of humerus
• inferior to radial groove

Question 18

distal attachment of triceps brachii (long, lateral, medial head)

Answer 18

proximal end of olecranon of ulna and fascia of forearm

Question 19

innervation of triceps brachii

Answer 19

radial nerve

Question 20

main action of triceps brachii (long, lateral, medial head)

Answer 20

• chief extensor of forearm
• long head resists dislocation of humerus
• especially important during adduction

Question 21

what muscles are attached to tip of coracoid process of scapula

Answer 21

1. coracobrachialis
2. short head of biceps brachii
3. pectoralis minor

Question 22

musculocutaneous nerve

Answer 22

• from brachial plexus, pierces 穿過 coracobrachialis and descends 下降 between brachialis and biceps brachii
• supply lateral side of forearm

Question 23

radial nerve

Answer 23

• from brachial plexus, enters the triangular interval with profunda brachii artery, pierces lateral intermuscular septum
• travels in the radial (spiral) groove
• supply posterior arm and forearm
  .

Question 24

cutaneous innervation of the skin on anterior and posterior compartment of the arm

Answer 24

refer back to notes

Question 25

brachial artery

Answer 25

from axillary artery at lower border of teres major , to ulnar and radial arteries at the neck of the radius, in the cubital fossa

Question 26

main branches of brachial artery

Answer 26

1. profunda artery
2. muscular and humeral nutrient
3. superior and inferior ulnar collateral

Question 27

borders of triangular interval at the back of the arm (superior, medial, lateral)

Answer 27

superior - teres major
medial - long head of triceps brachii
lateral - lateral head of triceps brachii, shaft of humerus

Question 28

contents of triangular interval

Answer 28

• radial nerve
• profunda brachii artery