THE ROOTS OF THE PERIPHERAL NERVES, ETC. 



151 



LOCALIZATION OF FUNCTION IN THE DIFFERENT SEGMENTS OF THE 



SPINAL CORD. 



KEGMENT. 



MUSCLES. 



REFLEXES. 



SENSATION. 



2dandodCer- 

 vlcal. 



4th Cervical. 



5th Cervical. 



6th Cervical. 



7th Cervical. 



8th Cervical. 

 1st Dorsal. 



2d and 12th 

 Dorsal. 



Sterno-mastoid. 

 Trapezius. 

 Scaleni and neck. 

 Diaphragm. 



Diaphragm. 



Deltoid. 



Biceps. Coraco-brachialis. 



Supiuator longus. 



Rhomboid. 



Supra- and infra- spiuatus. 



Deltoid. 



Biceps. Coraco-brachialis. 

 Brachialis anticus. 

 Supiuator longus. 

 Supinator brevis. 

 Deep muscles of shoulder- 

 blade 



Rhomboid. Teres minor. 

 Pectoralis (clav. part). 

 Serratus magnus. 



Biceps. Brachialis anticus. 



Pectoralis (clav. part). 



Serratus magnus. 



Triceps. 



Extensors of wrist and 



ringers. 

 Pronators. 



Triceps (long head). 

 Extensors of wrist and 



fingers. 



Pronators of wrist. 

 Flexors of wrist. 

 Subscapular. 

 Pectoralis (costal part). 

 Latissimus dorsi. 

 Teres major. 



Flexors of wrist and 



fingers. 

 Intrinsic muscles of hand. 



Extensors of thumb. 

 Intrinsic hand-muscles. 

 Thenar and hypothenar 

 eminences. 



Muscles of back and ab- 

 domen. 

 Erec tores spinae. 



Back of head to vertex. 

 Neck. 



Hypoc h ond rium ( ?) . 



Sudden inspiration pro- 

 duced by sudden pres- 

 sure beneath lower 

 border of ribs. 



Pupil. 4th to 7th cerv. Neck. 

 Dilatation of the pupil j Upper shoulder. 



produced by irrita- Outer arm. 



tion of neck. 



Scapular. 



5th cervical to 1st dorsal 



Irritation of skin over 

 the scapula produces 

 contraction of the 

 scapular muscles. 



Supiuator longus. 



Tapping its tendon in 

 wrist produces flexion 

 of forearm. 



Triceps. 



5th to 6th cervical. 



Tapping elbow-tendon 



produces extension of 



forearm. 

 Posterior wrist. 

 6th to 8th cervical. 

 Tapping tendons causes 



extension of hand. 



Anterior wrist. 



7th to 8th cervical. 



Tapping anterior ten- 

 don causes flexion ot 

 wrist. 



Palmar. 7th cervical to 

 1st dorsal. 



Stroking palm causes 

 closure of fingers. 



Epigastric. 4th to 7th 

 dorsal. 



Tickling mammary re- 

 gion causes retraction 

 of the epigastrium. 



Abdominal. 7th to llth 

 dorsal. 



Stroking side of abdo- 

 men causes retraction 

 of belly. 



Back of shoulder and 

 arm. 



Outer side of arm and 

 forearm. 



Anterior upper two- 

 thirds of arm. 



Outer side of arm and 



forearm. 

 Inside and front of 



forearm. 



Inner and back of arm 



and forearm, 

 Radial distribution in 



the hand. 



Forearm and hand ; 

 median and ulnar 

 areas. 



Ulnar distribution to 

 hand. 



Skin of chest and abdo- 

 men, in bands run- 

 ning around and 

 downward corre- 

 sponding to spinal 

 nerves. 



Upper gluteal region. 



