GA Upper Arm Muscles, Vasculature and Innervation Flashcards Preview

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Flashcards in GA Upper Arm Muscles, Vasculature and Innervation Deck (22)

Muscles of the Upper Arm (5)

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


Biceps Brachii Muscle

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


Brachialis Muscle

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


Coracobrachialis Muscle

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.


Triceps Brachii Muscle

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.


Anconeus Muscle

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)


Brachial Artery

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.


Profunda brachii artery

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


Superior ulnar collateral artery

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


Inferior ulnar collateral Artery

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


Superficial veins

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


Deep Viens

brachial veins


Cephalic Vein

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


Basilic Vein

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.


Median Cubital vein

crosses cubital fossa obliquely, joins caphalic and basilic vv.


Intermediate antebrachial vein

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


Brachial veins

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.


Musculocutaneous Nerve

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


Radial Nerve

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


Meidal Brachial cutaneous nerve

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


Intercostalbrachial Nerve

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


Superior Lateral brachial cutaneous nerve

from axillary n., supplies skin over lower deltoid