1 66 GLOSSARY. 



Arrecto'res pili (L. arrectus, upright ; pilus, a hair) 

 Nonstriated muscle fibres which are attached to hair 

 follicles. 



Arterid'le (L. dim. of arteria, an artery). A small artery which 

 immediately opens into a capillary. 



Assimilation (L. assimilare, from as (= ad\ to; similis, like). 

 The taking in of nutritive material by living cells. 



Associated movements. A term applied to the simultaneous 

 movements of both eyes, or of separate groups of 

 muscles. 



Aste'rion (Gr. asteo, a star). The junction of parietal, mastoid, 

 and occipital bones. 



Astig'matism (Gr. a, priv. ; stigma, a mark made with a sharp- 

 pointed instrument). Irregularity in the refracting surfaces 

 of cornea or lens, causing blurred vision. 



At'avism (L. atavus, an ancestor from amis, a grandfather). 

 Reversion to a primitive type, shown by the persistence 

 of structures which should normally undergo suppression ; 

 e.g. moles. 



Atax'ia (Gr. a, priv. : taxis, order from tasso, I put in order). 

 Disturbance of co-ordination. 



Atelec'tasis (Gr. ateles, imperfect from #, priv., and telos, 

 completion ; extasis, extension). Unexpanded or col- 

 lapsed state of lungs. 



Auerbach's plexus. A plexus of nerves in muscular layers of 

 digestive canal. 



Augmentor nerve (L. angmentum, an increase). The 

 accelerator fibres of the sympathetic supplying the 

 heart. 



Automatic (Gr. automates (autos mao\ acting of one's own 

 will). As applied to a nerve centre. The origination of 

 an impulse and its conduction therefrom independently 

 of a previously received nerve stimulus ; e.g. respiratory 

 centre in medulla. 



Axis cylinder (L. axis, Gr. axon, an axle-tree, a pole). The 

 central mass of fine fibres which constitute the conduct- 

 ing part of a nerve. 



Eacte'ria (Gr. bakterwn, a rod, a walking-stick). Microscopic 



fungi occurring in decomposing organic matter. 

 Ba'sion (L. basis, a pedestal). A point of the skull which 



