Week 3 Human Anatomy
3.2 Heart Chambers:
1. Identify four chambers of the heart and their anatomical relationships:
- Right Atrium: it receives the deoxygenated blood from the body via the superior and inferior
vena cava.
- Right Ventricle: Pumps blood to the lungs via the pulmonary trunk.
- Left Atrium: receives oxygenated blood from the lungs.
- Left Ventricle: pumps oxygenated blood to the body parts via the aorta.
WHY?
- We want to be able to understand the chamber flow is foundational for interpreting
cardiac output, pressure gradients, and pathologies like CHF or a-fib. In PT, this helps us
monitor exercise tolerance and cardiovascular response during a patient’s rehab.
2. Describe the function and structure of the atrioventricular valves:
- Tricuspid Valve: between the right atrium and right ventricle (3 leaflets)
- Mitral Valve (Bicuspid): Between left atrium and left ventricle (2 leaflets)
- Chordae Tendineae and Papillary Muscles: Prevent valve prolapse during ventricular
contraction.
WHY?
- Valve dysfunction can lead to murmurs and reduced cardiac efficiency. PTs need to
recognize signs of poor perfusion or fatigue during activity and know when to refer.
3. Explain the role of semilunar valves and their pressure-driven mechanism:
- Pulmonary Valve: right ventricle to pulmonary trunk
- Aortic Valve: left ventricle to aorta
- Passive, pressure-driven: open during systole, close during diastole via cusps that catch
backflow.
WHY?
- Valves regulate outflow. Dysfunction affects system circulation and can limit exercise
capacity. PTs must tailor interventions to cardiovascular limitations.
4. Understand fetal circulation and the significance of the fossa ovalis:
,- Fossa Ovalis: remnant of the foramen ovale, which allows blood to bypass lungs in utero.
- Closure at Birth: Prevents mixing of oxygenated and deoxygenated blood.
WHY?
- A patent foramen ovale can persist and cause complications like paradoxical emboli.
Pediatric PTs especially need to understand developmental anatomy and its clinic
implications.
5.Recognize key muscular structures within the heart chambers:
- Pectinate Muscles: found in atria, allow volume expansion.
- Trabeculae Carneae: found in ventricles, muscular ridges aiding contraction.
- Septomarginal Trabecula conducts impulses to papillary muscles.
- Conus Arteriosus: funnels blood from RV to pulmonary trunks.
WHY?
- These structures support efficient contraction and conduction. In PT, understanding
cardiac conduction helps interpret arrhythmias and guide safe activity progression.
6. Explain the conduction system’s path through the heart:
- Interventricular Septum: Houses part of the conduction system.
- Septomarginal Trabecula transmits impulses to papillary muscles for valve stabilization.
WHY?
- Coordinated contraction ensures effective blood ejection. PTs working with cardiac
patients must understand conduction to interpret ECGs and recognize signs of
dysfunction.
Quiz 3.2:
1. The mitral valve is associated with a condition (mitral valve prolapse) in which blood
regurgitates into the left atrium when the left ventricle contracts.
2. The papillary muscles will assist with preventing reflux from the ventricles into the atria
during systole.
3. The right atrium of the heart is lined with pectinate muscles
4. The right atrium of the heart will receive blood from the superior and inferior vena cava
5. The fossa ovalis lies in the interatrial septum
3.3 Heart Structure:
1. Describe the fibrous skeleton of the heart and its functional significance:
, - The fibrous skeleton is made of dense connective tissue rings surrounding each heart valve.
- It provides:
- Structural support for valves
- attachment points for cardiac muscle
- electrical insulation between atria and ventricles.
WHY?
- Understanding this structure helps explain why atrial and ventricular contractions are timed
separately- critical rehab patients for interpreting EKGS and recognizing arrhythmias.
- Pts working with cardiac rehab patients need to grasp how conduction delays can affect
cardiac output and exercise tolerance.
2. Identify key external landmarks of the heart from anterior/posterior views:
- Anterior:
- Apex (inferolateral point of left ventricle)
- Anterior interventricular sulcus ( houses coronary vesses)
- Ascending aorta, pulmonary trunk, SVC/IVC
- Posterior:
- Base of the heart (posterior atria)
- Posterior interventricular sulcus
- Pulmonary veins entering left atrium
WHY?
- Landmarks help orient imaging and auscultation techniques.
- In post-surgical or trauma cases, knowing anatomical relationships aids in positioning
and mobilization strategies to avoid compromising cardiac function.
3. Explain the components and pathway of the heart’s conducting system:
- Pathway Overview: SA node to atrial walls to AV node to AV Bundle to R/L bundle branches to
Purkinje fibers
- Right Ventricle Specifics:
- Moderator band helps conduct impulses to papillary muscles.
- Contraction starts at apex and moves upward.
3.2 Heart Chambers:
1. Identify four chambers of the heart and their anatomical relationships:
- Right Atrium: it receives the deoxygenated blood from the body via the superior and inferior
vena cava.
- Right Ventricle: Pumps blood to the lungs via the pulmonary trunk.
- Left Atrium: receives oxygenated blood from the lungs.
- Left Ventricle: pumps oxygenated blood to the body parts via the aorta.
WHY?
- We want to be able to understand the chamber flow is foundational for interpreting
cardiac output, pressure gradients, and pathologies like CHF or a-fib. In PT, this helps us
monitor exercise tolerance and cardiovascular response during a patient’s rehab.
2. Describe the function and structure of the atrioventricular valves:
- Tricuspid Valve: between the right atrium and right ventricle (3 leaflets)
- Mitral Valve (Bicuspid): Between left atrium and left ventricle (2 leaflets)
- Chordae Tendineae and Papillary Muscles: Prevent valve prolapse during ventricular
contraction.
WHY?
- Valve dysfunction can lead to murmurs and reduced cardiac efficiency. PTs need to
recognize signs of poor perfusion or fatigue during activity and know when to refer.
3. Explain the role of semilunar valves and their pressure-driven mechanism:
- Pulmonary Valve: right ventricle to pulmonary trunk
- Aortic Valve: left ventricle to aorta
- Passive, pressure-driven: open during systole, close during diastole via cusps that catch
backflow.
WHY?
- Valves regulate outflow. Dysfunction affects system circulation and can limit exercise
capacity. PTs must tailor interventions to cardiovascular limitations.
4. Understand fetal circulation and the significance of the fossa ovalis:
,- Fossa Ovalis: remnant of the foramen ovale, which allows blood to bypass lungs in utero.
- Closure at Birth: Prevents mixing of oxygenated and deoxygenated blood.
WHY?
- A patent foramen ovale can persist and cause complications like paradoxical emboli.
Pediatric PTs especially need to understand developmental anatomy and its clinic
implications.
5.Recognize key muscular structures within the heart chambers:
- Pectinate Muscles: found in atria, allow volume expansion.
- Trabeculae Carneae: found in ventricles, muscular ridges aiding contraction.
- Septomarginal Trabecula conducts impulses to papillary muscles.
- Conus Arteriosus: funnels blood from RV to pulmonary trunks.
WHY?
- These structures support efficient contraction and conduction. In PT, understanding
cardiac conduction helps interpret arrhythmias and guide safe activity progression.
6. Explain the conduction system’s path through the heart:
- Interventricular Septum: Houses part of the conduction system.
- Septomarginal Trabecula transmits impulses to papillary muscles for valve stabilization.
WHY?
- Coordinated contraction ensures effective blood ejection. PTs working with cardiac
patients must understand conduction to interpret ECGs and recognize signs of
dysfunction.
Quiz 3.2:
1. The mitral valve is associated with a condition (mitral valve prolapse) in which blood
regurgitates into the left atrium when the left ventricle contracts.
2. The papillary muscles will assist with preventing reflux from the ventricles into the atria
during systole.
3. The right atrium of the heart is lined with pectinate muscles
4. The right atrium of the heart will receive blood from the superior and inferior vena cava
5. The fossa ovalis lies in the interatrial septum
3.3 Heart Structure:
1. Describe the fibrous skeleton of the heart and its functional significance:
, - The fibrous skeleton is made of dense connective tissue rings surrounding each heart valve.
- It provides:
- Structural support for valves
- attachment points for cardiac muscle
- electrical insulation between atria and ventricles.
WHY?
- Understanding this structure helps explain why atrial and ventricular contractions are timed
separately- critical rehab patients for interpreting EKGS and recognizing arrhythmias.
- Pts working with cardiac rehab patients need to grasp how conduction delays can affect
cardiac output and exercise tolerance.
2. Identify key external landmarks of the heart from anterior/posterior views:
- Anterior:
- Apex (inferolateral point of left ventricle)
- Anterior interventricular sulcus ( houses coronary vesses)
- Ascending aorta, pulmonary trunk, SVC/IVC
- Posterior:
- Base of the heart (posterior atria)
- Posterior interventricular sulcus
- Pulmonary veins entering left atrium
WHY?
- Landmarks help orient imaging and auscultation techniques.
- In post-surgical or trauma cases, knowing anatomical relationships aids in positioning
and mobilization strategies to avoid compromising cardiac function.
3. Explain the components and pathway of the heart’s conducting system:
- Pathway Overview: SA node to atrial walls to AV node to AV Bundle to R/L bundle branches to
Purkinje fibers
- Right Ventricle Specifics:
- Moderator band helps conduct impulses to papillary muscles.
- Contraction starts at apex and moves upward.
