PLATE XXVIII. 

 THE SACRAL PLEXUS 



In this plate the sacral plexus is shown exposed by removing parts of the ilium and 

 sacrum by means of two saw-cuts one from the top of the great sacro- sciatic notch 

 obliquely upwards and inwards, and the other downwards along the edge of the sacrum, 

 BO planned as to avoid cutting into the sacral foramina. The pyriformis has been drawn 

 out of the pelvis, and rests on the posterior surface of the ischium. The great sacro- 



SUPERIOR GLUTEAL 



(4 5 L -US ) 



To Glut Medius. Minimus 



Jt Tensor Fasciae Fomor'6 



EXTERNAL POPLITEAL 



(*SL *l ZS ) 

 Branch 10 KNEE JOINT 

 Com. Perongt Splits info 



ANTERIOR TIBIAL 

 Tibialis Anhcus 

 Ext, long digit 



u prop hallucis 

 Peroneus Terlius 

 Ext: brevis digft 



ANKLE TARSA. 



METATARSAL JOINTS 



StttnjConfiffuous sidma 

 of /*' * Ztf toes 



MUSC: CUT. 



Pfonus long 

 brevis 

 Skin tiorsurn 



Skin 



CVGIUS 



Sphincter 



INTERNAL POPLITEAL 



<SL l 2 3S ) 



To Hamstrings !c Add Magnus 



Gasfroc.Soleus.Popliteus.Plantans 



Communicant tioialls 



KNEE JOINT, then called 



POST TIBIAL 

 To Flexor long digit & Hallucis 



Tibialis posncus 

 ANKLE j6lNT_ Skin of hae.1 

 Splits into 



rv 



thigh * calf 

 lower part ofgluteal 

 region pertneum 

 Scrotum or tabium 



INT;PUDIC 



-CZ3t 



-, I Iscnio- rectal 

 n }pe.rine.urn.l 



fossa 



...abium, or 



\<5crotLtm A: De/its (prepuc 



Lev Ani & ext.Sphinrer 



INT PLANTAR 

 Flexor brevift digit 



hallucis 

 Abduct .. 



lor 2 inner rumbricalea 

 Skin of Sole 



EXT PLANTAR 



All rest of muscles in Sole 

 no! supplied by Internal plantar 



TARSL < METATARSAL JOIMT8 



a/cin of Sole * oufer /? /oes 



Trans perinei 

 Erector penis 

 Accelerator Urinaj 

 Comp. Urethras 

 -Bulb & Corpus Cavernosum 

 A Glans 



sciatic ligament has been cut and turned down, while the lesser sacro-sciatic ligament 

 and the coccygeus muscle with which it is intimately connected are divided together. 



The accompanying diagram shows a fairly usual arrangement of the sacral plexus ; 

 the parts shaded indicate the posterior branches, the light the anterior (as in the brachial 

 plexus). The sacral plexus presents many varieties, and the above must only be regarded 

 as a fairly normal arrangement. 



