MUSCLES OF THE LOWER EXTREMITY, ETC. 243 



LEG. 



interior Tibial Region. Posterior TiMal Region. 



Tibialis anticus, , Superficial Group. 



Extensor longus digitorum, Gastrocnemius, 



Peroneus tertius, Plantaris, 



Kxtensor longus pollicis. Soleus. 



Fibular Region. Deep [posterior] Layer. 



Peroneus longus, Popliteus, 



Peroneus brevis. Flexor longus ppllicis, 



Flexor longus digitorum, 

 Tibialis posticus. 



FOOT. 

 Dorsal Region. 



Extensor brevis digitorum, 

 Interossei dorsales. 



Plantar Region. 

 1st Layer. 3d Layer. 



Abductor pollicis, Flexor brevis pollicis, 



Abductor minimi digiti, Adductor pollicis, 



Flexor brevis digitorum. Flexor brevis minimi digiti, 



Transversus pedis. 



2d Layer. 4th Layer. 



Musculus accessorius, Interossei plantares. 



Lumbricales. 



GLUTEAL REGION. 



Gluteus maximus, Obturator internus, 



Gluteus medius, Gemellus inferior, 



Gluteus minimus, Obturator externus, 



Pyriformis, Quadratus femoris. 

 Gemellus superior, 



Dissection. The subject being turned on its face, and a block placed 

 beneath the os pubis to support the pelvis, the student commences the 

 dissection of this region, by carrying an incision from the apex of the 

 coccyx along the crest of the ilium to its anterior superior spinous process ; 

 or vice versa, if he be on the left side. He then makes an incision from 

 the posterior fifth of the crest of the ilium, to the apex of the trochanter 

 major, this marks the upper border of the gluteus maximus ; and a third 

 incision from the apex of the coccyx along the fleshy margin of the lower 

 border of the gluteus maximus, to the outer side of the thigh, about four 

 inches below the apex of the trochanter major. He then reflects the inte- 

 gument, superficial fascia, and deep fascia, which latter is very thin over 

 this muscle, from the gluteus maximus, following rigidly the course of its 

 fibres ; and having exposed the muscle in its entire extent, he dissects the 

 integument and superficial fascia from off the deep fascia which binds 

 down the gluteus medius, the other portion of this region. 



