· functionally unimportant adductor
Origin
· apex of coracoid process
· medial to short head of biceps
Path
· musculocutaneous nerve passes through muscle
· through 2 fused heads
Insertion
· middle 1/3 of medial border of humerus
· may be associated with ligament of Struthers
· attaches to supracondylar spur
· passes to medial epicondyle
· represents degenerated 3rd head
· may entrap median nerve and brachial artery
Nerve supply
· musculocutaneous nerve
Origin
· long head
· supraglenoid tubercle of scapula
· adjoining glenoid labrum
· short head
· apex of coracoid process
· lateral to coracobrachialis
Path
· long head
· passes through synovial cavity of shoulder joint
· beneath transverse ligament in intertubercular groove
· range of mobility under ligament is 6 cm
· short head
· lies side by side with long head
· bellies fuse and form flattened tendon
· just above elbow joint
· tendon rotates laterally
· bicipital aponeurosis
· arises from medial side of tendon
· at level of elbow joint
Insertion
· tendon inserted into posterior part of tuberosity of radius
· separated from anterior border by bursa
· aponeurosis inserted into subcutaneous border of ulna
· via deep fascia
Nerve supply
· musculocutaneous nerve (C5,6)
Origin
· front of lower 2/3 of humerus
· clasps deltoid insertion
· some fibres from lower part of spiral groove
· medial intermuscular septum
Path
· covers anterior part of elbow joint
Insertion
· coronoid process and tuberosity of ulna
· extends along medial supracondylar line
· separates coracobrachialis and triceps
· gives origin to some fibres of
· brachialis
· medial head of triceps
· pierced by
· ulnar nerve
· ulnar collateral artery
· extends along lateral supracondylar line
· separates brachialis and triceps
· gives origin to some fibres of
· brachioradialis
· ECRL
· medial head of triceps
· pierced by
· radial nerve
· anterior descending branch of profunda brachii artery
· continuation of axillary artery
· lies in groove between biceps and brachialis
· median nerve
· lies lateral to it above
· crosses it in front
· lies medial to it below
· ulnar nerve
· lies posterior to artery above
· leaves it and pierces medial IM septum
· lies in groove between biceps and triceps
Branches
Profunda brachii
· leaves through lower triangular space
· with radial nerve
· runs in spiral groove with radial nerve
· supplies triceps
· ends as anterior and posterior anastomotic branches
· join cubital anastomosis
Superior ulnar collateral
· accompanies ulnar nerve
Inferior ulnar collateral
· divides into anterior and posterior branches
· join cubital anastomosis
Muscular
· to flexor muscles
Nutrient
· to humerus
· brachial vein (venae comitantes)
· accompany brachial artery
· basilic vein
· pierces deep fascia in middle of arm
· joins brachial vein
· cephalic vein
· lies in groove between deltoid and pectoralis minor
· pierces clavipectoral fascia
· enters axillary vein
· clasps 3rd part of axillary artery at formation
· lies lateral to artery
· medial root crosses vessel
· nerve crosses artery and lies on medial side
· gives twig to elbow joint
· gives
· twig to shoulder joint
· branch to coracobrachialis
· pierces coracobrachialis
· between conjoined heads
· lies between biceps and brachialis
· supplies both muscles
· appears at lateral margin of biceps tendon
· as lateral cutaneous nerve of forearm
· lies posterior to brachial artery
· inclines backwards
· pierces medial IM septum at lower 1/3
· accompanied by
· ulnar collateral artery
· branch of radial nerve to medial head of triceps
· gives off branch to elbow joint behind medial epicondyle
· lies anterior to vessels
· pierces deep fascia in upper part of arm
· supplies anteromedial skin
· lies medial to vessels
· passes anterior to vessels
· pierces deep fascia on medial arm with basilic vein
· supplies skin over medial forearm
· lateral cutaneous branch of 2nd intercostal nerve
· supplies skin of axilla