Myoseptum Connective tissue forming the boundary
between successive myotomes
Myositis Inflammation of the muscle tissue
Myxoma Benign neoplasia of connective tissue origin
Necropsy Alternative name for autopsy, pertaining to
animals; the same as post mortem or obduction
Necrosis Focal (limited) death of tissues and cells
Necrotic Death of circumscribed piece of tissue
Neoplasia A new growth, (usually abnormal)
Neovascularization Proliferation of blood vessels of a
different kind than usual in tissue
Nephritis Inflammatory or inflammatory-like reaction of
the kidney
Nephrocalcinosis Calcium deposits within kidney tubules
Nephromegaly Enlargement of the kidney
Nephron Basic structural and functional unit of the kidney
Nephrosis Degeneration of tubular epithelium of the kidney
Neuritis Inflammation/lesion of a nerve or their sheaths
Neuroma Neoplasia connected with a nerve
Neutrophil A leukocyte having no affinity for acid or basic
dyes, but stainable by neutral dyes
Normal Anything which agrees with the regular or
established type
Notifiable disease A serious infectious disease that must be
reported to the appropriate authorities
Nucleus The inner essential part of a tissue cell
Obstruction Blockage of an organ when the normal passage
is abnormally hindered
Occlusion The closure of an opening
Odontoblasts Cells forming the outer surface of dental
pulp that produces the dentin of a tooth
Odontoma Neoplasia developing from or containing tooth
structures
Oedema Abnormal infiltration of tissues with fluid
Oesophagus Muscular tube through which food passes
from the pharynx to the stomach
Oncogenic Agent capable of neoplasia induction
Oncogenesis Formation of neoplasia
Operculum Moveable flap following the contours of the
gill chamber downward and forward beneath the jaws
Optic chiasma Located at the bottom of the brain immediately below the hypothalamus
Oogenesis Cellular development that leads to the formation
of a mature egg
Ossification Replacement of a tissue (usually cartilage)
by bone
Osteitis Inflammation of bone
Osteoclast Large multinucleated cell responsible for the
dissolution and absorption of bone
Overt disease Apparent disease
Pachymeningitis Inflammation of the dura, or external,
fibrous, layer of the meninges
Pancreatitis Inflammation of the pancreas, may be acute or
chronic
Pancytopenia Reduction in the number of red, white cells
and platelets in the blood
Panophthalmitis Inflammation involving structures adjacent
to the sclera
Pansporoblast Reproductive sporoblast that gives rise to
more than one spore in the order Myxosporida
Pansteatis Generalised inflammatory infiltration of adipose
tissues
Papillae Small projections
Papillitis Inflammation of the optic disc
Papilloma Benign neoplasia involving overgrowth of
epithelial tissue
Papillomatosis Surface elevation caused by hyperplasia
and enlargement of contiguous dermal papillae
Parasite An organism which obtains food or shelter from
another host organism
Parenchyma All the soft tissue of internal organs except
the muscular flesh. The essential cells of an organ (e.g.
hepatocytes in the liver)
Perineurium The sheath of connective tissue that covers a
bundle of nerve fibres
Patchy Irregular
Pathogen Any organism which by living on or within
another organism causes disease in the host
Pathogenesis The origin and development of disease
Pathogenicity The potential to cause injury to the host
Pathogenic Producing disease or pathological changes
Pathological condition A deviation from normal to known
or unknown origin
Pathognomonic Sign that is characteristic of a disease that
it can be used to make a diagnosis
Pathology Science which deals with the causes of and the
changes produced in the body by disease
Peliosis Extensive areas of red blood cells and dilated blood
vessels within the parenchyma
Peduncle The narrow part of the body caudal to the vent to
which the tail is attached
Pemphigoid-like Formation of ‘vesicles’ between epidermal
cells
Pemphigoid Group of skin disorders similar to but clearly
distinguishable from pemphigus
Pemphigus Distinctive group of skin and mucous membrane diseases
Pericarditis Acute or chronic inflammation of the
pericardium
Pericardium The fibroserous sac surrounding the heart
(this is closed in teleosts)
Periorbital Situated around the orbit of the eye
Perisplenitis Inflammation of the peritoneal capsule of the
spleen
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201
between successive myotomes
Myositis Inflammation of the muscle tissue
Myxoma Benign neoplasia of connective tissue origin
Necropsy Alternative name for autopsy, pertaining to
animals; the same as post mortem or obduction
Necrosis Focal (limited) death of tissues and cells
Necrotic Death of circumscribed piece of tissue
Neoplasia A new growth, (usually abnormal)
Neovascularization Proliferation of blood vessels of a
different kind than usual in tissue
Nephritis Inflammatory or inflammatory-like reaction of
the kidney
Nephrocalcinosis Calcium deposits within kidney tubules
Nephromegaly Enlargement of the kidney
Nephron Basic structural and functional unit of the kidney
Nephrosis Degeneration of tubular epithelium of the kidney
Neuritis Inflammation/lesion of a nerve or their sheaths
Neuroma Neoplasia connected with a nerve
Neutrophil A leukocyte having no affinity for acid or basic
dyes, but stainable by neutral dyes
Normal Anything which agrees with the regular or
established type
Notifiable disease A serious infectious disease that must be
reported to the appropriate authorities
Nucleus The inner essential part of a tissue cell
Obstruction Blockage of an organ when the normal passage
is abnormally hindered
Occlusion The closure of an opening
Odontoblasts Cells forming the outer surface of dental
pulp that produces the dentin of a tooth
Odontoma Neoplasia developing from or containing tooth
structures
Oedema Abnormal infiltration of tissues with fluid
Oesophagus Muscular tube through which food passes
from the pharynx to the stomach
Oncogenic Agent capable of neoplasia induction
Oncogenesis Formation of neoplasia
Operculum Moveable flap following the contours of the
gill chamber downward and forward beneath the jaws
Optic chiasma Located at the bottom of the brain immediately below the hypothalamus
Oogenesis Cellular development that leads to the formation
of a mature egg
Ossification Replacement of a tissue (usually cartilage)
by bone
Osteitis Inflammation of bone
Osteoclast Large multinucleated cell responsible for the
dissolution and absorption of bone
Overt disease Apparent disease
Pachymeningitis Inflammation of the dura, or external,
fibrous, layer of the meninges
Pancreatitis Inflammation of the pancreas, may be acute or
chronic
Pancytopenia Reduction in the number of red, white cells
and platelets in the blood
Panophthalmitis Inflammation involving structures adjacent
to the sclera
Pansporoblast Reproductive sporoblast that gives rise to
more than one spore in the order Myxosporida
Pansteatis Generalised inflammatory infiltration of adipose
tissues
Papillae Small projections
Papillitis Inflammation of the optic disc
Papilloma Benign neoplasia involving overgrowth of
epithelial tissue
Papillomatosis Surface elevation caused by hyperplasia
and enlargement of contiguous dermal papillae
Parasite An organism which obtains food or shelter from
another host organism
Parenchyma All the soft tissue of internal organs except
the muscular flesh. The essential cells of an organ (e.g.
hepatocytes in the liver)
Perineurium The sheath of connective tissue that covers a
bundle of nerve fibres
Patchy Irregular
Pathogen Any organism which by living on or within
another organism causes disease in the host
Pathogenesis The origin and development of disease
Pathogenicity The potential to cause injury to the host
Pathogenic Producing disease or pathological changes
Pathological condition A deviation from normal to known
or unknown origin
Pathognomonic Sign that is characteristic of a disease that
it can be used to make a diagnosis
Pathology Science which deals with the causes of and the
changes produced in the body by disease
Peliosis Extensive areas of red blood cells and dilated blood
vessels within the parenchyma
Peduncle The narrow part of the body caudal to the vent to
which the tail is attached
Pemphigoid-like Formation of ‘vesicles’ between epidermal
cells
Pemphigoid Group of skin disorders similar to but clearly
distinguishable from pemphigus
Pemphigus Distinctive group of skin and mucous membrane diseases
Pericarditis Acute or chronic inflammation of the
pericardium
Pericardium The fibroserous sac surrounding the heart
(this is closed in teleosts)
Periorbital Situated around the orbit of the eye
Perisplenitis Inflammation of the peritoneal capsule of the
spleen
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201