THE BONES OF THE LOWER LIMB 



of the external lateral ligament 

 of the ankle-johit. Above the 

 external malleolus on the inner 

 aspect there is a rough, convex, 

 triangular surface about i^ inches 

 long for the inferior interosseous 

 ligament. The anterior border 

 projects at first forwards, and 

 then slopes downwards and back- 

 wards to the tip. The projecting 

 part gives attachment to the 

 anterior ligament, and the lower 

 portion of the sloping part to the 

 anterior fasciculus of the external 

 lateral ligament of the ankle- 

 joint. The posterior border is 

 shorter than the anterior, and is 

 vertical. It presents the peroneal 

 groove for the tendons of the 

 peroneus longus and peroneus 

 brevis. The tip is the most 

 dependent part, and is situated at 

 the meeting of the posterior border 

 and the lower sloping part of 

 the anterior border. It gives at- 

 tachment to the middle fasciculus 

 of the external lateral ligament. 



The lower extremity presents 

 several nutrient foramina for 

 branches of the anterior and 

 posterior peroneal, and external 

 malleolar, arteries. 



The shaft is slightly curved, 

 the convexity being directed 

 backwards in the upper part, 

 and inwards lower down. It 

 is quadrilateral in its upper 

 three-fourths, where it presents 

 four borders and four surfaces, 

 but it is somewhat triangular 

 in the lower fourth. The ant era- 

 external border, which is the 

 most prominent, commences in 

 front of* the head, and passes 

 straight downwards until it 

 reaches the lower fifth, where it 

 bifurcates. One division passes 

 to the anterior margin of the ex- 

 ternal malleolus, and the other to 



-Styloid Process 



- Tibial Faxret on Head 



-—Neck 



.- Tibialis Posticus 



Medullary Foramen 



J|. Postero-intemal Border 



Antero-intemal or Interosseous 



Border 



. _Antero-external Border 

 -- Postero-extemal Border 



Triangular Area for Inferior 



Interosseous Ligament 



__ Facet on External Malleolus 

 for Astragalus 



"~ Digital Fossa 



Fig. 147. — The Right Fibula 

 (Internal View). 



