164 



LABORATORY MANUAL OF HUMAN ANATOMY 



(a) Eetinaculum Mm. peronaeorum superius (0. T. external annular 



ligament). 



(b) Eetina^ulum Mm. peronaeorum inferius. 



What is the relation of the latter to the ligamentum cruciatum 

 cruris? (See Fig. 67.) 



Dissect out carefully the common synovial sheath of the pero- 

 neal muscles (vagina tendinum Mm. peronaeorum communis). 



FIG. 68. 



M. tibialis ant. A. et V. tibial. ant. and N. peronaeus prof. 

 M. ext. hal. long. 



N. saphenus et 

 V. saphena 



M. tibial. post- 



M. flex. dig. long. 



A. tibial. post.' 

 N. tiabialis/. 



M. plantar 



^ M. ext. dig. long. 



//// " - M. peronaeus long. 



v M. peronaeus brev. 

 V. saphena parva 



M. flex. hal. long. ( 

 M. triceps surae 



N. suralis 



Cross-section passing through the inferior part of the leg. Right side, segment distal to the line of 



section. 



Anterolateral region (lighter shade). The two groups, anterior and lateral, are plainly separated. 

 The M. tiabialis ant. has become tendinous and accompanies the A. tibialis ant. The fleshy fibres of 

 the M. peronaeus long, have disappeared. The M. peronaeus brev. is attached to the corresponding 

 surface of the fibula. The N. peronaeus superf. has emerged from between the two muscles, but runs 

 beneath the fascia cruris, which it is about to perforate. 



Posterior region (darker shade). There is to be noted a displacement of the muscles. The M. 

 tibialis post, has left the space between the flexors and, gaining the medial aspect of the leg, passes 

 beneath the tendon of the M. flex. dig. long. 



Superficial layer (intermediate shade). The tendo calcaneus [Achillis] receives the lowest fibres of 

 the M. soleus. (From Poirier et Charpy, Traite d'Anat. hum., Paris, 1899, 2 ed., t. ii. p. 268, Fig. 196.) 



What is its extent proximalward and distalward? This 

 sheath may be seen to better advantage if injected. Note here 

 also the subcutaneous bursa over the lateral malleolus (bursa 

 subcutanea malleoli later alis). 



Peroneal Nerves. 



Trace the course of the N. peronaeus communis and dissect 

 out all the branches : 



