Veterinary anatomy: cardiovascular anatomy Flashcards
greek and latin for blood
hema; sanguis
in domestic animals blood takes up what percentage of total body weight
6…8% of body weight
what percentage of total blood loss is fatal
15-25%
define baroreceptors
a type of mechanoreceptors in the walls of blood vessels and the heart that are stimulated by the absolute level of, and changes in, arterial pressure
cardiac function is controlled by
baroreceptors
which result in changes to the heart rate, contractility and vascular tone
respiratory function is controlled centrally by
chemoreceptors
greek and latin for heart
cor; cardia
in juveniles the heart is bordered cranially by the
thymus
shape of heart in Un
cone-shaped
the heart is what shape in car
ovoid
cardiac tip and situation
apex cordis points downwards and slightly to the left close to the sternum
define pericardium
conical serous sac-like structure enclosing the heart and the roots of the largest vessels
pericardium covered by what?
pleura pericardiaca
fibrous pericardium
pericardium fibrosum
pericardium fibrosum forms what in ru and su
ligg. sternopericardiaca
pericardium fibrosum forms what in eq
lig. sternopericardiacum
pericardium fibrosum forms what in car
lig. phrenicopericardiacum
pericardium divide into what
pericardium fibrosum & pericardium serosum
serous pericardium
pericardium serosum
pericardium serosum consists of
parietel and visceral layers
translate parietel and visceral layers
lamina parietalis & lamina visceralis [epicardium]
latin for visceral layer of the serous pericardium
lamina visceralis [epicardium] of pericardium serosum
pericardial cavity
cavum pericardii
layers of the pericardium from inside out
lamina visceralis [epicardium]
(cavum pericardii)
lamina parietalis
pericardium fibrosum
(pleura pericardiaca)
wall of the heart consists of what three layers
epicardium
myocardium
endocardium
another name for epicardium
visceral lamina (lamina visceralis)
serous pericardium composed of what 3 parts
visceral pericardium
pericardial cavity
parietal pericardium
left cardiac surface
facies auricularis
right cardiac surface
facies atrialis
fat-filled coronary groove
sulcus coronarius
sulcus coronarius contains what and marks what?
contains the coronary blood vessels and marks the separation of the atria and ventricles, except at arteriosal conus
The atrial surface of the heart is marked by?
the subsinusoidal interventricular groove
(sulcus interventricularis subsinuosus)
which extends from the coronary groove to the apex of the heart
subsinusoidal interventricular groove
sulcus interventricularis subsinuosus
paraconal interventricular groove
sulcus interventricularis paraconalis
on the cranial surface of each atrium is a pouch-like appendage called
an auricle
auricula: dextra et sinistra
right atrium
atrium dextrum
right atrium receives blood from what (3)
receives blood from the
- cranial vena cava
- caudal vena cava
- coronary sinus
interatrial septum
septum interatriale
what is fossa ovalis
located on the interatrial septum, is the depressed membranous oval fossa which is a remnant of the fetal oval foramen
the right atrium is the location for what node?
sinoatrial node
opening of cranial vena cava
ostium venae cava cranialis
opening of caudal vena cava
ostium venae cava caudalis
opening of coronary sinus
ostium sinus coronarii
right ventricle
ventriculus dexter
right atrioventricular opening
ostium atrioventriculare dextrum
right atrioventricular valve or tricuspid valve
valva atrioventricularis dextra
seu
valva tricuspidalis
what forms most of the anterior surface of the heart and is crescent-shaped in cross-section
ventriculus dexter
2 eng names for valva atrioventricularis dextra
right atrioventricular valve or tricuspid valve
tendineal cords
chordae tendinae
cone-shaped papillary muscles
mm. papillares
the cusps of the tricuspid valve are connected to
tendineal cords (chordae tendinae)
chordae tendinae are connected to
cone-shaped papillary muscles (mm. papillares) within the ventricular wall
the right ventricle is separated from the left by
the interventricular septum = septum interventriculare
Deoxygenated blood passes from the right ventricle through?
ostium trunci pulmonalis
semilunar pulmonary valve
valva trunci pulmonalis
what structure at the beginning of the pulmonary trunk aids in flow of blood
the one-way semilunar pulmonary valve (valva trunci pulmonalis)
arteriosal conus
conus arteriosus
what is conus arteriosus
the dilatation at the craniodorsal angle of the right ventricle from which the pulmonary trunk arises
arterial ligament
ligamentum arteriosum
what attaches the pulmonary trunk to the aorta
ligamentum arteriosum
what nerve passes around the arterial ligament
the recurrent laryngeal nerve
left atrium
atrium sinistrum
what forms the dorsocaudal section of the base of the heart
atrium sinistrum
left atrium receives what from where
oxygenated blood from the lungs via the pulmonary vein
left atrium lies under
the tracheal bifurcation
bifurcatio trachealis
into what do the pulmonary veins open
left atrium = atrium sinistrum
openings of pulmonary veins
ostia venarum pulmonalium
left ventricle
ventriculus sinister
conical apex of the heart formed by
ventriculus sinister
left atrioventricular opening
ostium atrioventriculare sinistrum
blood passes from the left atrium to the left ventricle through what
the left atrioventricular opening
(ostium atrioventriculare sinistrum)
left atrioventricular valve
valva atrioventricularis sinistra
bicuspid valve
valva bicuspidalis
mitral valve
valva mitralis
blood passes from the left ventricle to the?
ascending aorta through the aortic opening and the semilunar aortic valve
aortic opening
ostium aortae
semilunar aortic valve
valva aortae
septomarginal trabecula
trabecula septomarginalis
in both ventricles what extends from interventricular septum to the opposite parietal wall
septomarginal trabecula (trabecula septomarginalis)
translate and what are heart bones
ossa cordis
bones in the aortic fibrous ring
commonly in bo
where is heart cartilage found
cartilago cordis is located near the aortic orifice in Car, su, eq
(frequently senilely calcified in su and eq)
The heart receives how much of the output of the left ventricle
about 10…15%
aortic bulb
bulbus aortae
the coronary arteries arise from?
bulbus aortae
above the aortic valve and carry blood to the heart wall
left coronary artery
a. coronaria sinistra
the interventricular paraconal branch of the left coronary artery
ramus interventricularis paraconalis
of a. coronaria sinistra
the circumflex branch of the left coronary artery
ramus circumflexus of a. coronaria sinistra
septal branches of the left coronary artery
rami septales
of left coronary artery a. coronaria sinistra
describe a. coronaria sinistra
- is usually larger, and supplies the walls of the left ventricle and most of the septum.
- It passes subepicardially between the left auricle and the pulmonary trunk to the coronary groove
- divides into the interventricular paraconal branch, the circumflex branch and to the septal branches
right coronary artery
a. coronaria dextra
the interventricular subsinusoidal branch of the right coronary artery
ramus interventricularis subsinuosus of a. coronaria dextra
describe a. coronaria dextra
- passes between the right auricle and the pulmonary trunk to the right part of the coronary groove.
- On the atrial surface it turns into the subsinusoidal interventricular groove and divides into the interventricular subsinusoidal branch and the septal branches
right coronary artery divides into
the interventricular subsinusoidal branch (ramus interventricularis subsinuosus)
and the septal branches
Cardiac venous blood is returned to the heart through
the veins of heart:
- great cardiac vein
- middle cardiac vein
- small and right cardiac veins
great cardiac vein
v. cordis magna
middle cardiac vein
v. cordis media
small and right cardiac veins
vv. cordis: dextra et minimae
describe v. cordis magna
- is a continuation of the coronary sinus
- opens into the right atrium
- runs parallel with the left coronary artery
describe v. cordis media
- is located in the subsinusoidal interventricular groove
- opens into the coronary sinus or into the right atrium
where do small and right cardiac veins open into
into all heart chambers, esp. atria
Conducting system of the heart consists of (4)
- sinoatrial node
- atrioventricular node
- atrioventricular bundle, “bundle of His”, + its right and left terminal branches (crura)
- cardiac conduction fibres or Purkinje fibers
sinoatrial node
nodus sinuatrialis
location of sinoatrial node
in the wall of the right atrium near the opening of cranial vena cava
purpose of the sinoatrial node
a pacemaker
- gives origin to rhythmical impulses and as a result, the atrial muscle contracts
- impulses travel via internodal tracts to the next node
atrioventricular node
nodus atrioventricularis
location of the atrioventricular node
in the base of the septal wall of right atrium, close to the opening of coronary sinus.
purpose of the atrioventricular node
Through this node, the impulse is conducted from atria to the ventricles.
The speed of conduction of impulse through the atrioventricular node is very slow, which allows sufficient time for the atria to empty their blood into the ventricles completely.
atrioventricular bundle
fasciculus atrioventricularis
what is the atrioventricular bundle
the distal portion of the atrioventricular node (the bundle of His).
It is the only pathway that connects the myocardium of the atria to the myocardium of the ventricles electrically.
location of the atrioventricular bundle
descends through the fibrous skeleton of the heart to reach the inferior border of the membranous part of the interventricular septum
in the muscular part of the septum the atrioventricular bundle divides into two limbs called
crus: dextrum et sinistrum
of fasciculus atrioventricularis
the fibers of Purkinje are located in
septomarginal trabeculae = trabecula septomarginalis
a cardiac cycle is
one cycle of atrial and ventricular contraction and relaxation
systole is
muscle contraction; blood is ejected to the arteries
diastole is
heart relaxes and refills with blood
points of movement of a cardiac electrical impulse (5)
- sinoatrial node (right atrium)
- atrioventricular node (septal wall of right atrium)
- atrioventicular bundle (atria to ventricles)
- bundle branches (interventricular septum)
- Purkinje fibers (septomarginal trabeculae)
blood vessels have what three layers
tunica intima
tunica media
tunica externa
tunica intima consists of
- a single layer of endothelial cells surrounded by a thin connective tissue basement membrane with elastic fibers
- elastic membrane present in larger arteries and absent in veins
- releases endothelins that cause vasoconstriction
describe tunica media
- the thickest layer in arteries
- circularly arranged elastic fibres and vascular smooth muscles, which control the vessel diameter
- external elastic membrane present in larger arteries and absent in veins
- larger veins contain small blood vessels and nerves within medial tunic
describe adventitial tunic of blood vessels
also called external tunic
- the thickest layer in veins is entirely made of loose connective tissue and elastic fibres, only some smooth muscle fibers.
- It also contains vegetative nerves, nervi vasorum, that supply the vessel as well as nutrient capillaries, vasa vasorum, in the larger vessels.
- external tunic helps to hold the vessel in relative position
arteries are divided into what 3 groups based on size
- conducting or elastic arteries
- distributing or muscular arteries
- resistance arteries
translate capillary
vas capillare
sinusoid capillaries found where
in the liver, spleen, suprarenal and parathyroid glands, red bone marrow
describe sinusoid capillaries
- wide, with an irregular lumen and pores
- without connective tissue covering, the endothelial cells being in direct contact with the cells of the organ.
- blood flow through sinusoids is very slow
- the cells of the wall are capable of phagocytosis
translate vein, greek latin
vena; phleps
translate venous valves
valvula venosa
what is a venule
lat. venula — smallest veins, they have thin middle layer with a few muscle cells
define rete mirabile
a small but dense network of blood vessels formed by the breaking up of a larger vessel into branches that usually reunite into one trunk
forms at the base of the skull and in the renal glomerula
translate and define carotid sinuses
sinus caroticus — a dilatation that contains baroreceptors within its walls,
respond to changes in blood pressure
carotid sinuses are located
in the wall at the origin of the internal carotid artery
carotid sinus has a relatively thin tunica media and an abundance of?
glossopharyngeal nerve fibers in the tunica externa
translate and define carotid bodies
glomus caroticus — chemoreceptors, monitor changes in blood composition.
- These are oval bodies 3 × 5 mm in size
- innervated by vagus and glossopharyngeal nerves
where are carotid bodies found
located near the branch of the common carotid arteries.
translate and define aortic bodies
glomus aorticum — chemoreceptors, located in the aortic arch near the arteries to the head and limbs.
- They are structurally similar to the carotid bodies and have the same function.
describe pulmonary or lesser circulation (5)
blood flows from
- the right ventricle
- pulmonary trunk
- through the lungs
- pulmonary vein
- left atrium
describe systemic or greater circulation
blood flows from
- left ventricle
- aorta, arteries, arterioles, capillaries
- venules, veins, vena cavae
- right atrium
Pulmonary trunk
truncus pulmonalis
Pulmonary trunk arises from
the right ventricle
(and has the semilunar pulmonary valve)
tuncus pulmonalis is attached to the aorta by
the fibrous arterial ligament (lig. arteriosum)
the pulmonary trunk branches into
the right and left pulmonary arteries
(a. pulmonalis: dextra et sinistra)
the right and left pulmonary arteries
a. pulmonalis: dextra et sinistra
pulmonary veins
venae pulmonales
Ascending aorta
aorta ascendens
bulb of the aorta
bulbus aortae
what is the bulb of the aorta
bulbus aortae is the short dilated part of the aorta at its origin
aortic arch
arcus aortae
what is the descending aorta
aorta descendens is the caudal continuation of the aortic arch
define ‘the lesser circulation’
the passage of blood from the right ventricle through the pulmonary artery to the lungs and back through the pulmonary veins to the left atrium.
or simply heart-lungs
define ‘the greater circulation’
The circulation of blood through the arteries, capillaries, and veins of the general system, from the left ventricle to the right atrium.
or simply, systemic circulation
define portal circulation
Most consist of two serial capillary beds connected by one or more larger vessels.
A capillary bed pools into another capillary bed through veins, without first going through the heart.
Brachiocephalic trunk
truncus brachiocephalicus
right subclavian artery
a. subclavia dextra
left subclavian artery
a. subclavia sinistra
a. subclavia sinistra arises from where in car, su?
from aortic arch
a. subclavia sinistra arises from where in ru, eq?
from brachiocephalic trunk
bicarotic trunk
truncus bicaroticus
bicarotic trunk is usually absent in what species?
in car
truncus bicaroticus is a common trunk for?
for the carotid arteries
usually in absent car
Subclavian artery (left and right)
a. subclavia sinistra et dextra
Costocervical trunk and costocervical vein
truncus costocervicalis
v. costocervicalis