The Heart & Pericardium
Dr. Rakesh Kumar Verma
Assistant Professor
Department of Anatomy
KGMU UP Lucknow
DR.RAKESH VERMA,AP,ANATOMY.
KGMU,UP Lko
, Fibrous skeleton
• Dense fibrous connective A
tissue forms a structural
foundation around AV &
arterial orifices.
• It is site of attachment to atria
& ventricles. L R
• Musculature of atria &
ventricles does not cross this
fibrous ring.
• It is also an electrical insulator
between atria and ventricles
P
except via AV Bundle/Bundle
of His.
DR.RAKESH VERMA,AP,ANATOMY.
KGMU,UP Lko
, Conduction system
– Specialized cardiac muscle fibers
– Self-excitable
– Repeatedly generate action potentials that
trigger heart contractions
– Act as pacemaker & Form conduction
system
– Consist of SA , AV Node,Bundle of His &
Purkinje fibers
DR.RAKESH VERMA,AP,ANATOMY.
KGMU,UP Lko
, Conduction System
• SA node acts as natural pacemaker
– Faster than other auto rhythmic fibers
– Initiates 100 times per second
• Nerve impulses from autonomic nervous
system (ANS) and hormones modify timing
and strength of each heartbeat
DR.RAKESH VERMA,AP,ANATOMY.
KGMU,UP Lko
Dr. Rakesh Kumar Verma
Assistant Professor
Department of Anatomy
KGMU UP Lucknow
DR.RAKESH VERMA,AP,ANATOMY.
KGMU,UP Lko
, Fibrous skeleton
• Dense fibrous connective A
tissue forms a structural
foundation around AV &
arterial orifices.
• It is site of attachment to atria
& ventricles. L R
• Musculature of atria &
ventricles does not cross this
fibrous ring.
• It is also an electrical insulator
between atria and ventricles
P
except via AV Bundle/Bundle
of His.
DR.RAKESH VERMA,AP,ANATOMY.
KGMU,UP Lko
, Conduction system
– Specialized cardiac muscle fibers
– Self-excitable
– Repeatedly generate action potentials that
trigger heart contractions
– Act as pacemaker & Form conduction
system
– Consist of SA , AV Node,Bundle of His &
Purkinje fibers
DR.RAKESH VERMA,AP,ANATOMY.
KGMU,UP Lko
, Conduction System
• SA node acts as natural pacemaker
– Faster than other auto rhythmic fibers
– Initiates 100 times per second
• Nerve impulses from autonomic nervous
system (ANS) and hormones modify timing
and strength of each heartbeat
DR.RAKESH VERMA,AP,ANATOMY.
KGMU,UP Lko
