v. i 4 



ADRENAL TISSUE 



165 



sp n 



Fig. 104. Dissection of suprarenal bodies and sympathetic nervous system of the 



dogfish. 

 b.a. brachial artery; c.a. coeliac artery; d.a. dorsal aorta; g. first sympathetic ganglion; hyp. 

 hypoglossal nerve; I.e. longitudinal sympathetic 'chain'; n.card. cardiac branch of vagus; 

 p.b.p. post-branchial plexus; r.c. ramus communicans; s. sensory fibre; s.a. segmental artery; 

 sg. sympathetic ganglion; sp.a. anterior splanchnic nerve; sp.m. middle splanchnic nerve; 

 spa. spinal nerve; sup. suprarenal body; v. ventricle; v.d. vas deferens; vs. vago-sympathetic 

 anastomosis; X. vagus; X.br. branchial branch of vagus; X.visc. visceral branch of vagus. 

 (After Young, Quart. J. Micr. Sci. 75.) 



taining a small ciliated pit, a reminder that the organ was once a 

 ciliated mucus-secreting gland. 



The adrenal tissue is especially interesting because the two parts, 

 so closely associated in mammals, are here found widely separated. A 

 segmental series of glands, the suprarenals, are rich in noradrenaline. 

 They project into the dorsal wall of the posterior cardinal sinus and can 

 be seen when it is opened (Fig. 104). The more anterior ones are 

 fused to form an elongated structure on either side of the oesophagus. 



