82 LABORATORY MANUAL OF HUMAN ANATOMY 



(a) Brachial artery (A. brachialis). 



(aa) Radial artery (A. radialis). 



(ab) Ulnar artery (A. ulnaris}. 



(b) Tendon of M. biceps brachii. Find 



(ba) Bursa bicipitoradialis. 



(bb) Bursa cubitalis interossea. 



(c) Median nerve (N. medianus). 



Remove the fat and clean the structures so as to examine in 

 the floor of the space 



(a) Brachial muscle (M. brachialis). 



(b) Supinator muscle (M. supinator) (0. T. supinator brevis). 



Divide the lacertus fibrosus (0. T. semilunar fascia or bicipi- 

 tal fascia), pull the M. brachioradialis far later alward and the 

 M. pronator teres far medialward. Examine carefully 



(a) Radial nerve (N. radialis). 



(aa) Deep ramus (ramus profundus). 



(ab) Superficial ramus (ramus superficialis) . 



(b) Radial recurrent artery (A. radialis recurrens). 



(c) Inferior ulnar collateral artery (A. collateralis ulnaris inferior) (0. 



T. anastomotica magna). 



(d) Anterior ulnar recurrent artery (A. recurrens ulnaris anterior). 



(e) Epitrochlear lymph-gland. 



Structures behind the Intermuscular Septa (Posterior Compartment 



of Arm). 



Dissect the fascia brachii off the M. triceps, cleaning its three 

 heads thoroughly. This will be facilitated by putting the muscle 

 on the stretch (flex the forearm and raise the inferior angle of 

 the scapula as far as possible). Dissect out the A. profunda 

 brachii and the N. radialis and their branches. Study 



(a) Triceps muscle (M. triceps brachii}. 



Study its form, position, origin, insertion, action, and 

 innervation. 



(aa) Long head (caput longum). 



(ab) Lateral head (caput laterals} (0. T. outer head). 



(ac) Medial head (caput mediale) (0. T. inner head). 

 Compare the M. triceps with the M. quadriceps femoris. Is a 



M. subanconaeus present? 



(b) Radial nerve (N. radialis) (0. T. musculospiral nerve). 



Insert a grooved director or the handle of a scalpel 

 beneath the lateral head of the triceps muscle along the 

 sulcus N. radialis (0. T. musculospiral groove). With 

 this as a guide, cut through the lateral head of the triceps 

 and reflect it medialward and downward. Study the rela- 



