60 THE IlEAU. 



of this portion of the brain is represented, and the origins of the respi 

 ratory nerves. ' r t v r i. 



Tlie spinal marrow extending throagh a canal m the centre of the bones ot the 



neck, back, and loins, to the extremities of the tail, and from which the 



nei-ves of feeling and of motion, that supply every part of the frame 



except the head, arise, 

 r The septum narium, or cartilaginous division between the nostrils. 

 t The same out oif at the lower part, to show the spongy turbinated, turban 



shaped, bones, filling the cavity of the nostril. 



1 The palate. 



V The molar-teeth, or grinders. _ . 



t' The inferior maxillary bone, containing the incisor teeth, Or nippers. The 



canine tooth, or tush, is concealed by the tongue. 

 w The posterior maxillary, or lower jaw with its incisors. 

 X The lips. 

 y The tongue. 

 z A portion of the os hyoides, or bone of the tongue, like a Greek «, «. 



1 The thyroid, helmet-shaped, cartilage, enclosing and shielding the neighboring 



parts. 



2 The epiglottis, or covering of the glottis, or aperture of the wind-pipe. 



3 The artyenoid, funnel-shaped, cartilages, having between them the aperture 



leading into the trachea or wind-pipe. 



4 One of the chordae vocales, cords or ligaments concerned in the formation of 



the voice. 



5 The saoculus laryngis, sac or ventricle of the larynx, < throat, to modulate the 



voice. 



6 The trachea, or wind-pipe, with its different rings. 



7 The soft palate at the back of the mouth, so constra ted as almost to prevent 



the pos.9ibility of vomiting. 



8 The opening from the back part of the mouth into the nostril. 



9 The cartilage covering the entrance into the eustachian tube, or coramunicatiOD 



between the mouth and internal part of the ear. 

 lO The oesophagus, or gullet. 



li The cricoid, ring-like, cartilage, below and behind th thyroid 

 12 Muscle of the neck, covered by the membrane of the back part of the mouth. 



As the frontal sinuses are lined by a continuation of the mem- 

 brane of the nose, they will sympathize with many of the affec- 

 tions of that cavity ; but the membrane of the sinuses is 

 susceptible of an inflammation peculiar to itself. The disease is 

 rare, and the cause of it has not been fully ascertained. It is 

 oftenest metastasir. of inflammation of the brain, — shifting of in- 

 flammation from the brain to the membrane of the sinus, or 

 jommunication of inflammation from tiio brain by proximity of 

 situation. 



Inflammation of the Membrane of the Frontal Sinuses. 

 —The attack is usually sudden — the horse is dull, lethargic, and 

 almost as comatose as in stoinach-staggers. The first thing that 

 excites suspicion of the actual character of the disease, is heat in 

 the situation of the frontal sinus, when the hand is placed on the 

 forehead. The lethargy soon passes over, and a state of the high- 

 est excitation succeeds. The conjunctiva and the membrane of 

 tlie nose are injected — ^the pulse is quick and hard — the horse 

 oecomes violent and dangerous ; he kicks, plunges, and, half con- 

 scious and half unconscious, he endeavors to do all the mischief 

 that he can- The disease is now evidentlv combined with, or is 



