Gross Anatomy I Exam 3

what divides the axillary artery

pectoralis minor muscle

what branches off of division one of axillary artery

superior thoracic artery

what branches off of division 2 of axillary artery

thoracoacromial artery, lateral thoracic artery

what branches off of division 3 of axillary artery

subscapular artery, anterior and posterior circumflex humeral arteries

what branches off of subscapular artery

circumflex scapular artery, thoracodorsal artery

what are the major tributaries of the axillary vein

cephalic vein, basilic vein, brachial veins

what are the superficial tributaries of the axillary vein

cephalic, basilic, median cubital, media antebrachial veins

what are the compartments of the brachium

anterior/flexor and posterior/extensor

what separates the compartments of the brachium

intermuscular septum

what is in the posterior compartment of the brachium

triceps brachii muscle

what are the parts of triceps brachii

long, lateral, medial heads

what is the origin for the long head of triceps brachii

infraglenoid tubercle

what is the origin for the lateral and medial heads of triceps brachii

posterior humeral shaft

what is the innervation for triceps brachii

radial nerve

what is the insertion for triceps brachii

olecranon process

what are the actions of triceps brachii

extend elbow joint, extend GHJ (long head)

what is in the anterior compartment of the brachium

biceps brachii, brachialis, coracobrachialis muscles

what are the parts of biceps brachii

long and short heads

what is the origin of the long head of biceps brachii

supraglenoid tubercle

what is the origin for the short head of biceps brachii

coracoid process

what is the insertion for biceps brachii

radial tuberosity, forearm fascia via bicipital aponeurosis

what is the innervation of biceps brachii

musculocutaneous nerve

what are the actions of biceps brachii

flex GHJ, flex elbow joint, supinate forearm when elbow is flexed

what is the origin for brachialis

anterior humeral shaft

what is the insertion for brachialis

ulnar tuberosity

what is the innervation for brachialis

musculocutaneous nerve

what are the actions of brachialis

flex elbow joint

what is the origin for coracobrachialis

coracoid process

what is the insertion for coracobrachialis

anterior humeral shaft

what is the innervation for coracobrachialis

musculocutaneous nerve

what are the actions of coracobrachialis

flex GHJ

what is special about the brachialis muscle

it is the only muscle that flexes the elbow when the forearm is pronated

what are the borders of the brachial artery

inferior border of teres major and the cubital fossa

what branches off of the brachial artery

deep brachial artery, ulnar collateral artery

what branches off of the deep brachial artery

radial collateral artery

what is costoclavicular syndrome

constant depression of the clavicle may compress and irritate brachial plexus against the ribs due to exiting through a small space between rib 1 and clavicle

where is the brachial plexus

deep to both pectoralis muscles

what does the brachial plexus exit

between the anterior and middle scalene muscles

what does the brachial plexus run with

axillary vein and artery

what are the parts of the brachial plexus

roots, trunks, divisions, cords, branches

how many roots are there

5

what make up the roots

ventral rami of C5-T1

what are the trunks made up of

intersections of the roots

what are the trunks

superior, middle, inferior trunks

what roots make up superior trunk

C5 and C6

what roots make up middle trunk

C7

what roots make up inferior trunk

C8 and T1

where does the inferior trunk lie

on rib 1

what forms the divisions

the trunks splitting

how many divisions are there

6, 3 anterior and 3 posterior

what are cords made up of

merging divisions

what are the cords

medial, lateral, posterior cords

what makes up the lateral cord

anterior divisions of superior and middle trunks (C5-C7)

what makes up the medial cord

anterior division of the inferior trunk (C8-T1)

what makes up the posterior cord

posterior divisions of all trunks (C5-T1)

how many larger terminal branches are there

5

branches of the roots

long thoracic nerve, dorsal scapular nerve

branches of the trunks

nerve to subclavius, suprascapular nerve

branches of lateral cord

musculocutaneous, median, lateral pectoral nerves

branches of medial cord

ulnar, medial pectoral, median, medial brachial cutaneous, medial antebrachial cutaneous nerves

branches of posterior cord

axillary, radial, upper subscapular, thoracodorsal, lower subscapular nerves

5 terminal branches

axillary, median, radial, ulnar, musculocutaneous