pericardium, heart vessels, impulse

Question 1

pericardium parietale

Answer 1

fibrous and serous layer.

covered by mediastinal pleura

Question 2

ligaments

Answer 2

lig. phrenicopericardiacum (pericardium fibrosum to diaphragm in dog)
lig. sternopericardiacum (pericardium fibrosum to sternum)

Question 3

sinus aortae sinistra

Answer 3

A. coronaria sinistra:

r. interventricularis paraconalis
r. circumflexus

Question 4

r. circumflexus

Answer 4

from a. coronaria sin.
gives off:
r. interventricularis subsinosous(ca, ru)
r. intermedius (ca, ru)

Question 5

sinusaortae dextra

Answer 5

A. coronaria dextra:

r. circumflexus (ca, ru)
r. interventricularis subsinosous (eq, su)

Question 6

sinus coronarius

Answer 6

R.A

V. cordis magna

Question 7

heart conducting system

Answer 7

consists if pacemaker cells capable of spontaneous electrical activity.
depolarization and contraction

Question 8

sinoatrial node

Answer 8

autonomous, has highest resting rate of depolarization,

initiates cardiac cycle

Question 9

primary pacemaker

Answer 9

SA node, overrides other pacemaker activity.

ensures coordinated contraction

Question 10

what happens if SA node disfunctions

Answer 10

AV node or purkinji fibres take over

Question 11

where is the SA node located

Answer 11

between the endocardium of the R.A wall, ventral to vena cava cran. opening

Question 12

how is the SA node innervated

Answer 12

by symp. and parasym. nervous system

Question 13

how does the SA node afftect the AV node

Answer 13

wave of excitement spreads to surrounding muscle, reaches AV node

Question 14

AV node

Answer 14

atrioventricular node.

located in septum interatrialis

Question 15

AV node gives:

Answer 15

gives origin of atrioventricular bundle

Question 16

atrioventricular bundle

Answer 16

bundle of his.

penetrates cardiac skeleton, divides into crus sin and dex

Question 17

where does crus dex and sin lie

Answer 17

under the endocardium of septum interventricularis

Question 18

crus dexter

Answer 18

crosses cavity of R.V in septomarginal trabecula, ends in wall if R.V

Question 19

crus sinistra

Answer 19

diffuses and ramifies into outer wall of L.V

Question 20

what happens to crux sin and dex

Answer 20

turn into purkinje fibers