Brachycephalic feline noses: CT and anatomical study of the relationship between head conformation and the nasolacrimal drainage system.

Aims: A study was designed to evaluate the influence of head conformation on the course of the nasolacrimal drainage system (NDS) in 31 brachycephalic and 15 mesocephalic cats using computed tomography (CT), CT-dacryocystography and anatomical methods.

Findings: The higher the degree of brachycephalia, the more the facial bones and upper canine teeth are displaced dorsally (ie, the more pronounced the dorsorotation). Dorsorotation leads to abnormal dislocation of the ventral nasal concha and to almost horizontally rotated upper canine teeth, and thus a steeply oriented NDS.

Use of corrosion casting techniques to evaluate coronary collateral vessels and anastomoses in hearts of canine cadavers.

Objective: To study and investigate branching patterns of the canine coronary arteries and collateral circulation by use of corrosion casting techniques.

Sample Population: 31 hearts obtained from cadavers of clinically normal dogs of various ages and breeds and of either sex.

Procedure: 3-dimensional reproduction of coronary arteries was achieved by postmortem injection and perfusion with casting materials into the aortic sinus via the ascending aorta.