78 THOMPSON YATES LABORATORIES REPORT 
III one experiment further the degeneration method was completed by teasing nerve- 
twigs to muscles, and the following muscular branches revealed degenerate motor fibres, the 
right hand Vllth cervical nerve having been severed in the vertebral canal twenty days 
previously. 
Supraspinatus. 
infraspinatus, 
pectoralis minor, 
biceps. 
supinator longus. 
extensor carpi radialis longior. 
extensor carpi radialis brevior. 
pronator radii teres. 
triceps (outer head). 
flexor carpi radialis. 
palmaris longus. 
flexor carpi ulnaris. 
extensor communis digitorum. 
extensor longus poUicis. 
extensor brevis poUicis.^ 
extensor ossis metacarpi poUicis. 
extensor indicis.^ 
superficial short muscles of thumb. Lumbricales (2) and interossei (2). 
flexor sublimis digitorum. 
flexor profundus digitorum. 
extensor carpi ulnaris. 
extensor minimi digiti.^ 
pronator quadratus^ (two degenerated fibres), 
supinator brevis (two degenerated fibres). 
The six muscles marked with a cross have therefore to be added to those given in the 
previous list in order to complete the motor distribution of the Vllth cervical segment. 
In this experiment not a single degenerate nerve-fibre was detected in the cervical sym- 
pathetic trunk. 
The phrenic trunk contained no degeneration after section of this root. 
VIIIth Cervical Nerve (Figs. 4 and 5) 
This skin-field has been delimited completely in three individuals, incompletely in a fourth 
and fifth. 
Example. — M. rhesm. i strong, young. At 10 a.m. The Vth, Vlth, and Vllth cer- 
vical, and the 1st, Ilnd, Ilird, IVth, and Vth tlioracic roots of the right side severed in the 
vertebral canal. 
