GA Upper Arm Muscles, Vasculature and Innervation

Question 1

Muscles of the Upper Arm (5)

Answer 1

Biceps Brachii muscle, Bracialis muscle, Coracobrachialis muscle, Triceps brachii muscle, Anconeus muscle

Question 2

Biceps Brachii Muscle

Answer 2

arises from 2 tendon heads
O - Short head- Tip of coracoid process, Long head - Supraglenoid tubercle and glenoid labrum
I - Tuberosity of the radius and fascia of the forearm via the biceps aponeurosis
A - supination of forearm; when supine, it flexes forearm; slight flexion at shoulder joint
I - Musculocutaneous Nerve (C5,C6,C7)
B - Brachial Artery

Question 3

Brachialis Muscle

Answer 3

O - Distal 1/2 of anterior surface of humerus
I - Coronoid process and tuberosity of ulna
A - Flexion of forearm in all positions
N - Musculocutaneous nerve (C5,C6) and Radial Nerve (C5,C7)
B - Brachial artery

Question 4

Coracobrachialis Muscle

Answer 4

O - Tip of coracoid process
I - Middle 1/3 of medial surface of humerus
A - Flex. and ADD of humerus
N - Musculocutaneous nerve (C5,C6,C7)
B - Axillary and brachial aa.

Question 5

Triceps Brachii Muscle

Answer 5

O - Long head - Infraglenoid tubercle, Lateral head - post. surface of humerus sup. to radial groove, Medial head - Post. surface of humerus inf. to radial groove
I - Proximal end of olecranon and fascia of forearm
N - Radial nerve (C6,C7,C8)
B - Profunda brachii a.

Question 6

Anconeus Muscle

Answer 6

O - Lateral epicondyle of humerus
I - Lateral surface of olecranon and superior part of post. surface of ulna
A - Assists in forearm extension; tenses capsule of elbow joint
N - Radial nerve (C7,C8,T1)

Question 7

Brachial Artery

Answer 7

Continuation of axillary artery at inferior border of teres major muscle, terminates at cubital ofssa as radial and unla aa., unnamed muscular branches
origin of the: prfunda brachii a., superior ulna collateral a., inferior ulna collateral a.

Question 8

Profunda brachii artery

Answer 8

most superior origin of brachial a., accompanies radial n., terminates as radial and radial collateral aa.
participates in periarticular anastomoses of elbow

Question 9

Superior ulnar collateral artery

Answer 9

arises on medial aspect of brachial a. near middle of arm, accompanies unbar n. post. to medial epicondyle, anastomoses with post. ulnar recuurent a. and inf. ulnar collateral a.
also participates in periarticular anastomoses of elbow

Question 10

Inferior ulnar collateral Artery

Answer 10

arises from medial aspect of brachial a. just proximal to elbow crease, passes anterior to medial epicondyle, anastomoses with sup. ulnar collateral a. and ant. ulnar collateral a.
also participates in periarticular anastomoses of elbow

Question 11

Superficial veins

Answer 11

Cephalic v., Basilic v., Median cubital v., Intermediate antebrachial v. (20%)

Question 12

Deep Viens

Answer 12

brachial veins

Question 13

Cephalic Vein

Answer 13

communication at elbow with median cubital v., passes lateral to biceps brachii m., enters deltopectoral groove

Question 14

Basilic Vein

Answer 14

pierces brachial fascia near inferior and middle 1/3 of arm, runs superiorly with brachial a. and meadial antebrachial cutaneous n., merges with brachial vv. and axillary v.

Question 15

Median Cubital vein

Answer 15

crosses cubital fossa obliquely, joins caphalic and basilic vv.

Question 16

Intermediate antebrachial vein

Answer 16

runs up midline of anterior forearm, divides into the median basilic v. and median cephalic v.

Question 17

Brachial veins

Answer 17

pairs veins, accompany the brachial artery, encompass it making an anastomoses network, formed at elbow by union of the venae comitantes of ulnar. and radial aa., end by merging with basilic v. to form axillary v.

Question 18

Musculocutaneous Nerve

Answer 18

from lateral cord of brachial plexus, pierces the coracobrachialis m. and supplies, continues distally b/w bicps brachia and brachialis mm. and supply them, emerges lateral to biceps tendon as later ante brachial cutaneous n. which supplies the skin of the lateral forearm

Question 19

Radial Nerve

Answer 19

terminal branch of the posterior cord of brachial plexus, runs with profunda brachii a. in radial groove, supplies all muscles in post. compartment
Inferior later brachial cutaneous n. - supplies skin of inferolateral arm
Posterior brachial cutaneous n. - supplies skin of post. arm
Posterior antebrachial cutaneous n. - supplies skin of posterior forearm

Question 20

Meidal Brachial cutaneous nerve

Answer 20

from medial cord of brachial plexus, supplies skin of medial arm to medial epicondyle

Question 21

Intercostalbrachial Nerve

Answer 21

from the 2nd intercoostal n., joins with medial chracial cutaneous n., supplies skin of upper medial arm

Question 22

Superior Lateral brachial cutaneous nerve

Answer 22

from axillary n., supplies skin over lower deltoid