| Term 
 
        | anterior longitudinal sulcus |  | Definition 
 
        | slanted depression between two ventricles; coronary vessels can be seen in this depression |  | 
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 | Definition 
 
        | tough piece of tissue between pulmonary trunk and the arch of the aorta; remains of ductus arteriosus |  | 
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        | epicardium (visceral pericardium) |  | Definition 
 
        | very thin outer layer covering the heart |  | 
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 | Definition 
 
        | thick, muscular portion of the heart wall |  | 
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 | Definition 
 
        | smoother, inner lining of the heart chambers |  | 
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        | very thick partition between ventricles |  | 
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        | tough cords running from between papillary muscules in the ventricles and valves known as cuspid valves |  | 
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        | mitral valve (bicuspid valve) |  | Definition 
 
        | cuspid valve between the left atrium and left ventricle |  | 
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 | Definition 
 
        | cuspid valve between the right atrium and the right ventricle |  | 
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        | present at the base of the aorta |  | 
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 | Definition 
 
        | very large, round band present in the right ventricle; not one of the chordae tendinae since it is not attached to a valve; believed to prevent overdistention of the right ventricle |  | 
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 | Definition 
 
        | red blood cells; most numerous blood cells in a smear; circular disc shaped, pink |  | 
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        | small, bluish-colored cellular fragments scattered throughout the smear |  | 
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 | Definition 
 
        | most numerous of white blood cells; cytoplasm light pink; fine, homogenous, neutral-staining granules; polymorphic nucleus (3-5 lobes which are connected by thin strands of nuclear material) |  | 
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        | Term 
 | Definition 
 
        | granular leukocyte which is not very numerous; cytoplasm contains many dark staining red granules; polymorphic nucleus (2 lobes) |  | 
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 | Definition 
 
        | least numerous of granular leukocytes; very dark staining basophilic granules in cytoplasm which appear to mask or overlie nucleus |  | 
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 | Definition 
 
        | second most common leukocyte in adult smears; agranular; dark purple, large nucleus surrounded by little sky blue cytoplasm |  | 
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 | Definition 
 
        | agranular leukocytes; various shapes for nuclei (rounded, indented, horseshoe shaped); nucleus stains purple, but not as dark as lymphocytes' |  | 
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