406 



ANATOMY FOR NURSES 



[Chap. XIX 



Spinal 

 Nerves 



Number 



, Variety 



Cervical 8 pairs. 



Thoracic 12 pairs. 



Lumbar 5 pairs. 



Sacral 5 pairs. 



Coccygeal 1 pair. 



31 pairs. 

 Medullated. 



Mixed (^J"f^^- 

 1 Motor. 



Origin — two roots 



Distribution 



trunks 



two 



Anterior in gray matter of cord. 



Posterior in spinal ganglia. 



Anterior, supplies extremities, and parts 



of body in front of spine. 

 Posterior, supplies muscles and skin of 



back of head, neck, and trunk. 



Located in cranial cavnty. 



Covered by meninges — same as spinal cord. 



J Maile — 49^ oz. average. 



\ Female — 44 oz. average. 



Weight 



Medulla 



Cerebellum < 



Divisions < 



Description 



Function 



Description 



Function 



f 



Pons Varolii 



Description 



Function 



Cerebrum 

 hemi- 

 spheres 



Description { 



' Oblong-shaped mass, upward 



continuation of cord. 



Gray matter in interior. 



. "VMiite matter on exterior. 



{Respirator}- centres. 

 Accelerator centre for heart. 

 Vasomotor centres, 

 f Flat oblong-shaped mass, 



overhangs medulla. 

 I 3-4^ in. transversely. 

 I 2-2 1 from before backward. 

 Gray matter on exterior. 

 White matter in interior. 

 f Coordination. 

 i Maintenance of equilibrium. 

 ■ A bridge of nerve-fibres con- 

 necting two halves of cere- 

 bellum and also medulla 

 \\-ith cerebrum. 

 Connect two halves of cere- 

 bellum. 

 j Connect medulla and cere- 

 l brum. 



f Egg-shaped or ovoidal. 

 ! Fills upper portion of skull. 



Gray matter 

 on outside 



r Fissures. 



\ Sulci. 



I Convolutions. 



