PBEIPHEHAL-NEETE HOOTS, SPINAL GANGLIA, SPINAL COBD. 337 



Segments. 



Muscles. 



Reflexes. 



Skin-sensation. 



2cl to 12th 

 Dorsal, 



1st Lumbar. 



2d Lumbar. 



3d Lumbar. 



4th Lumbar. 



5th Lumbar. 



1st and 2d 

 Sacral. 



3d to 5th 



Sacral 



Muscles of the back and 

 abdomen. 



Erector spinas. 



Ilio-psoas. 

 Sartorius. 

 Abdominal. 



Ilio-psoas. 

 Sartorius. 

 Flexors of the knee 



(Eemak?). 

 Quadriceps femqris. 



Quadriceps femoris. 

 Internal rotation of the 



femur. 

 Adductors of thigh. 



Abductors of thigh. 

 Adductors of thigh. 

 Tibialis antious. 

 Flexors of the knee 

 (Ferrier?). 



External rotators of the 



femur. 

 Flexors of the knee 



(Ferrier?). 

 Flexors of the foot. 

 Extensors of the toes. 

 Peronei. 



Flexors of the foot and 



toes. 

 Peronei. 

 Small foot-muscles. 



Muscles of perineum. 



Epigastric ( 4 to 7 dorsal ) 

 Abdominal (7 to 11 dor- 



Cremaster (1 to 3 lum- 

 bar). 



Patellar (2 to 4 lum- 

 bar). 



Gluteal reflex (4 to 5 

 lumbar ) . 



Plantar reflex. 



Teudo-A chillis reflex, 

 vesical and rectal. 



Skin of the breast, back, 

 abdomen, and upper 

 gluteal region. 



Skin of external geni- 

 talia. 

 Anterior partof scrotum. 



Outer side of hip. 



Anterior and 

 sides of hip. 



internal 



Inner side of hip and 



leg to the ankle. 

 Inner side of foot. 



Posterior side of hip, 

 thigh, and outer side 

 of foot. 



Posterior side of thigh, 

 outer side of leg and 

 foot. 



8kin of sacrum, anus, 

 perineum, and genita- 

 lia. 



The course of the fibers in the spinal cord is but partially known. To 

 understand it one must familiarize one's self with the cross-section of the 

 cord. In such a section one finds first a peripheral white substance and a 

 central H-shaped gray substance. 



The two halves of the spinal cord are divided by the anterior and pos- 

 terior longitudinal fissures, and connected by a commissure of white sub- 

 stance anteriorly, of gray matter posteriorly. The anterior broad portions 

 of gray matter are called the anterior, or ventral, horns, and the posterior 

 extension of gray matter, the posterior, or dorsal, horns. 



The proportions of the white to the gray substance at different levels of 



