60 



LABORATORY MANUAL OF HUMAN ANATOMY 



this oval opening to the fossa ovalis of the thigh, of the thin mem- 

 brane covering it to the cribriform fascia, of the axillary arch to 

 the cornu superius of the margo falciformis, and of the brachial 

 arch to the cornu inferius of the margo falciformis. 



(6) The continuity of the fascia axillaris lateralward with the fascia 

 brachii and with the fascia enclosing the M. latissimus dorsi and 

 Mm. teretes major et minor; it becomes inserted into the axillary 

 margin of the scapula. 



(c) The continuity of the fascia axillaris medialward, not with the fascia 

 pectoralis, but with the fascia coracoclavicularis, which encloses the 

 M. pectoralis minor. (Fig. 13.) The membrane extending from 

 the axillary fascia to the lower bolder of the M. pectoralis minor 

 was formerly called the suspensory ligament of the axilla (ligament 

 suspenseur of Gerdy). 



FIG. 13. 



M. subscap- 



Bundle of nerves and vessels.... 



M. teres min. 



M. teres maj . 



M. lat. dorsi 



-.-.Clavicula 

 M. subclav. 



....Fascia coracoclav. 



-M. pect. min. 



M. pect. maj. 

 Axillary arch 



Sagittal section of the axillary fossa. (Very schematic.) (From Poirier et Charpy, Trait< d'Anat. 

 hum., Paris, 1901, t. ii. p. 165, Fig. 128.) 



(d) The passage through the oval opening (and the cribriform fascia 



covering it) of the intercostobrachial nerves (Nn. intercosto- 

 brachiales) (0. T. intercostohumeral nerves). These represent the 

 lateral cutaneous rami of the second and third intercostal nerves 

 (rami cutanei laterales Nn. inter cost alium II. et III.}. It is inter- 

 esting that the vena basilica may occasionally bear the same rela- 

 tion to the oval opening that the vena saphena magna bears to the 

 fossa ovalis in the thigh; the usual condition, however, is for the 

 V. basilica to pass beneath the deep fascia a little above the elbow. 



(e) Later in the dissection, the reflections of the axillary fascia upon the 



arteries and nerves going to the forearm. 



Structures in the Fossa Axillaris. (See Figs. 14, 15, and 16.) 



The fascia axillaris may now be reflected backward, care 

 -being taken to dissect out carefully the intercostobrachial nerves. 

 The structures in the axillary fossa are to be isolated and 



