152 



LECTURES ON THE CENTRAL NERVOUS SYSTEM. 



LOCALIZATION OF FUNCTION (continued). 



SEGMENT. 



MUSCLES. 



REFLEXES. 



SENSATION. 



1st Lumbar. 



2d Lumbar. 



3d Lumbar. 



4th Lumbar. 



5th Lumbar. 



1st and 2d 

 Sacral. 



Ilio-psoas. 

 Sartorius. 



Ilio-psoas. Sartorius. 

 Flexors of knee (Remak) . 

 Quadriceps femoris. 



Quadriceps femoris. 

 Inner rotators of thigh. 

 Abductors of thigh. 



Abductors of thigh. 

 Adductors of thigh. 

 Flexors of knee (Ferrier). 

 Tibialis auticus. 

 Peroneus lougus. 



Outward rotators of thigh. 

 Flexors of knee (Ferrier). 

 Flexors of ankle. Peronei. 

 Extensors of toes. 



Flexors of ankle. 

 Long flexor of toes. 

 Intrinsic muscles of foot. 



Cremnstcric. 1st to 3d 



lumbar. 

 Stroking inner thigh 



causes retraction of 



scrotum. 



Patella tendon. 

 Striking tendon causes 

 extension of leg. 



Bladder centre. 

 2d to 4th lumbar. 



Rectal centre. 



4th 1 u m b ar to 2d sacral . 



Glutcal . 



4th to 5th lumbar. 



Stroking the buttock 

 causes dimpling in 

 fold of buttock. 



Achillis tendon. 



Over extension causes 

 rapid flexion of ankle, 

 called ankle-clonus. 



Plantar. 



Tickling sole of foot 

 causes flexion of toes 

 and retraction of leg. 



Skin over groin and 

 front of scrotum. 



Outer side of thigh. 



Front of thigh. 



Inner side of thigh and 



leg to ankle. 

 Inner side of foot. 



Lower gluteal region 

 back of thigh. Leg 

 and foot, outer part. 



Leg and foot except 



inner side. 

 Perineum and back of 



scrotum. 

 Anus. 



The course of the fibres in the spinal cord, gentlemen, is 

 only imperfectly known. In order to obtain a clear under- 

 standing of it, you must make yourselves perfectly familiar with 

 the appearances presented by a transverse section of the organ. 



In such a cross-section you will recognize the white sub- 

 stance externally and the gray matter in the form of a letter H 

 in the middle. The two lateral halves of the spinal cord are 

 divided by the anterior and posterior longitudinal (median) 

 fissures, and connected with each other by the anterior or white 

 commissure and the posterior or gray one. We call the anterior 

 extension of gray matter the anterior horns (cornua) and the 

 posterior extension the posterior horns or cornua. 



The proportions of gray and white substance are not the 

 same at all levels. The gray substance predominates markedly 



