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🫀Anatomy > Conducting System > Flashcards

Conducting System Flashcards

1
Q

SA node location

A

Juction of SVC and RA

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2
Q

Function of SA node

A

electrical pulses generated + spread through atrial muscle = threshold potential
Pacemaker
Fastest intrinsic depolarisation rate
Blood supply = SA nodal branch of RCA

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3
Q

SA node histology

A

SA node artery in centre
paler cells
poorly striated cells scattered in fibrous connective tissue
rich autonomic innervation - sympathetic + parasympathetic

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4
Q

Bachmann’s bundle

A

connects LA and RA

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5
Q

Internodal tracts in RA

A

anterior/middle/posterior

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6
Q

Cardiac Plexus

A

between ascending aorta and trachea

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7
Q

Sympathetic innervation

A

from T1 - T6

cervical + superior thoracic sympathic ganglia

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8
Q

Parasympathetic innervation

A

carried by vagus

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9
Q

AV node

A

Interatrial septum - near opening of coronary sinus + septal leaflet of tricuspid valve

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10
Q

Blood supply of AV node

A

AV nodal artery - branch of RCA

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11
Q

Sympathetic effect on rate

A

Speed up conduction

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12
Q

Parasympathetic effect on rate

A

Slow down conduction

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13
Q

AV bundle of His

A

Across fibrous skeleton

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14
Q

Left bundle branch

A

Anterior and Posterior fasicles

= Trifascular system

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15
Q

AV bundle location

A

centre of the interventricular septum

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16
Q

Blood supply of AV artery

A

LAD - supplies most of interventricular septum + AV bundle

17
Q

Purkinje fibres R

A

stimulate the muscle of interventricular septum + wall of RV
- including anterior papillary muscle + moderator band

18
Q

Purkinje fibres L

A

stimulate IVS + wall of LV

- including papillary muscles

19
Q

Location of artificial pacemaker

A

Pectoral region

- subcutaneous + submuscular

20
Q

Implantation of artificial pacemaker

A

access to heart chambers via puncturing subclavian vein or cephalic vein
Under fluroscopy to heart chamber - attatched to endocardium
Left side

🫀Anatomy (4 decks)

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