THE ILIAC REGION. 



415 



MUSCLES AND FASCOE OF THE LOWER EXTREMITY. 





The Muscles of the Lower Extremity 

 ing with the different regions of the limb. 



I. ILIAC REGION. 



P.soas magnus. 

 Psoas parvus. 

 Iliacus. 



II. THIGH. 



1. Anterior Femoral Region. 



Tensor fasciee femoris. 

 Sartorius. 

 T Rectus. 



Quadriceps j Yastus externus. 

 extensor " Yastus internus. 

 Crureus. 

 Subcrureus. 



2. Internal Femoral Region. 



Gracilis. 

 Pectineus. 

 Adductor longus. 

 Adductor brevis. 

 Adductor magnus. 



3. Crluteal Region. 



Gluteus maximus. 

 Gluteus medius. 

 Gluteus minimus. 

 Pyriforrnis. 

 Obturator internus. 

 Gemellus superior. 

 Gemellus inferior. 

 Quadratus femoris. 

 Obturator externus. 



4. Posterior Femoral 



Region. 



Biceps. 



Semitendinosus. 



Semimembranosus. 



III. LEG. 



5. Anterior Tibio-fibular 

 Region. 



Tibialis anticus. 



are subdivided into groups correspond- 



Extensor proprius hallucis. 

 Extensor longus digitorum. 

 Peroneus tertius. 



6. Posterior Tibio-fibular Region. 

 Superficial Layer. 



Gastrocnemius. 



Soleus. 



Plantaris. 



Deep Layer. 



Popliteus. 



Flexor longus hallucis. 

 Flexor longus digitorum. 

 Tibialis posticus. 



7. Fibular Region. 

 Peroneus longus. 

 Peroneus brevis. 



IV. FOOT. 



8. Dorsal Region. 

 Extensor brevis digitorum. 



9. Plantar Region. 

 First Layer. 



Abductor hallucis. 

 Flexor brevis digitorum. 

 Abductor minimi digiti. 



Second Layer. 



Flexor accessorius. 

 Lumbricales. 



Third Layer. 

 Flexor brevis hallucis. 

 Adductor obljquus hallucis. 

 Flexor brevis minimi digiti. 

 Adductor transversus hallucis. 



Fourth Layer. 

 The Interossei. 



I. MUSCLES AND FASCIA OF THE ILIAC REGION. 



Psoas magnus. Psoas parvus. Iliacus. 



Dissection. No detailed description is required for the dissection of these muscles. On 

 the removal of the viscera from the abdomen they are exposed, covered by the peritoneum and 

 a thin layer of fascia, the iliac fascia. 



The iliac fascia 1 is the aponeurotic layer which lines the back part of the 

 abdominal cavity, and covers the Psoas and Iliacus muscles throughout their whole 

 lr The student must not confound this fascia with the iliac portion of the fascia lata (see p. 420). 



