ARRANGEMENT OF THE FA SOLE. 253 



muscle, and so on until it finally gives off an expansion which 

 covers the entire group or region, becoming firmly attached to 

 the skeleton, and usually at its salient points. Hence we may 

 regard an aponeurotic fascia as a compound sheath, which con- 

 tains in its compartments muscles and their concomitant struc- 

 tures, and aids the former in their action by passive support ; 

 the support thus afforded is not always wholly passive, since, as 

 we have seen, some fasciae are regulated as to their tension by 

 special muscles, the fascias of the limbs affording good examples 

 of this arrangement. 



Some of the deep fasciae merit special attention, and we shall 

 consider them in the order generally observed in dealing with 

 other widely-diffused structures i.e., as appertaining to the Head, 

 the Trunk, and the Limbs. 



FASCIffi OF THE HEAD. 



In this region there is little that is noteworthy in the disposi- 

 tion of the fascia. It is, however, much stronger in the posterior 

 than in the anterior portion, the muscles of the former being 

 separated merely by folds which closely resemble ordinary con- 

 nective tissue. The temporal fascia is the name given to a 

 strong fold which covers the temporal fossa, being attached to 

 the parietal ridge and to the zygoma, thus covering the 

 temporalis and attollentes muscles. 



FASCLE OF THE TRUNK. 



These are the cervical, dorso-lumbar, abdominal, and thoracic 

 fasciae. 



The deep fascia of the cervical region is better marked than 

 the superficial, and it invests the muscles in the typical manner 

 above described, becoming attached to the vertebras. In the 

 dorso-lumbar region it is variable, being thin in some situations, 

 but thick and strong in others ; that covering the postero- 

 superior part of the longissimus dorsi is actually tendinous in 

 structure, giving origin to part of the gluteus maximus. The 

 dorso-lumbar fascia becomes continuous posteriorly with that of 

 the gluteal region, and anteriorly with that of the external 

 scapular region. 



The deep abdominal fascia chiefly includes the following 



