Biology 30S

(gulp)But sheep have nice

hearts…

EquipmentEquipmentPick these up (even if you are not cutting):Pick these up (even if you are not cutting):Plastic apronPlastic apronGogglesGogglesLatex GlovesLatex Gloves

These should be at your table:These should be at your table:Dissecting TrayDissecting TrayDissecting KitDissecting KitPaper TowelPaper TowelDissection GuideDissection Guide

Supplies you will use:Supplies you will use:

Set UpSet Up

Start reading the dissection guideStart reading the dissection guideCut out your labels when you are finished Cut out your labels when you are finished

reading (use scissors from the front)reading (use scissors from the front)Class orientationClass orientationRinse your pig heartRinse your pig heartBegin labBegin lab

Anterior ViewAnterior View

AtriaAtria

Rt.

Lt.

Ear-Ear-shaped shaped

extensionextension

s of thes of the atria.atria.

The atria wrap around to The atria wrap around to the the anterioranterior side of the side of the heart.heart.

Anterior

The Coronary The Coronary VesselsVessels

The cardiac muscle The cardiac muscle receives receives oxygenoxygen for for

metabolism and releases metabolism and releases waste productswaste products into into coronary vessels.coronary vessels.

AnterioAnterior Viewr View

The Great VesselsThe Great Vessels

The large veins & arteries, The large veins & arteries, which transport blood to which transport blood to

and from the heart muscle.and from the heart muscle.

Locating the Locating the great vessels:great vessels:

Anterior View--Aortic ArchAnterior View--Aortic Arch

AortaAorta

Arising from the Arising from the left ventricle of left ventricle of the heart is the the heart is the largest artery of largest artery of the body, the the body, the aorta.aorta. Rt

.Lt.

Anterior View--Aortic Anterior View--Aortic ArchArch

Brachiocephalic Brachiocephalic trunk (innominate trunk (innominate

artery)artery)

Rt.

Lt.

Lt. Lt. common common carotidcarotid

Aorta: Posterior View

AortaAorta

LtLt..

RtRt..

Posterior View--Vena Cavae

Superior Superior Vena Vena CavaCavaInferior Inferior

Vena Vena CavaCava

Lt.

Rt.

Posterior View--Pulmonary Artery

Lt. Lt. Pulmonary Pulmonary

ArteryArtery

Lt.

Rt.

Posterior View--Pulmonary Posterior View--Pulmonary VeinsVeins

Pulmonary veins are inferior to pulmonary Pulmonary veins are inferior to pulmonary arteriesarteries..

RtRt..

LtLt..

Rt.

Pulmonary VeinLt.

Pulmonary Vein

Dissect heart on the coronal plane.Dissect heart on the coronal plane.

Open heart Open heart on on

dissection dissection tray.tray.

Posterior half

Anterior half

Rt.

Lt.

Sep

tum

Lt. AtriumRt.

Atrium

aort

a

RtRt..

Lt.Lt.

Rt. Ventricle

Lt. Ventricle

Sep

tum

aort

a

Width of right

ventricular wall

Width of left

ventricular wall

Chordae

tendinae

Tricuspid valve

Cusp of valve

Papillary

muscles

Septu

m

Mitral valve

Septu

m

Septu

m

cusp

Chordae

tendinae

Chordae

tendinae

Check points--Exterior HeartCheck points--Exterior Heart

Students should be able to point Students should be able to point out:out:

•ApexApex of heart of heart

•Ventricles & AtriaVentricles & Atria

•Coronary VesselsCoronary Vessels

•AortaAorta

•Pulmonary Artery & VeinPulmonary Artery & Vein

•Sup & Inf Vena CavaSup & Inf Vena Cava

Check points--Interior HeartCheck points--Interior Heart

Students should be able to point out:Students should be able to point out:

•SeptumSeptum

•AtriaAtria & & VentriclesVentricles

•Aorta, Pulm Artery and VeinAorta, Pulm Artery and Vein

•Sup & Inf Vena CavaSup & Inf Vena Cava

•Tricuspid ValveTricuspid Valve, , Pulmonary Pulmonary ValveValve

•MitralMitral ValveValve, , Aortic ValveAortic Valve

Final Check pointFinal Check point

Students should be able to trace pathway Students should be able to trace pathway of blood through great vessels and heart.of blood through great vessels and heart.

(begin with vena cava and end with vena cava)(begin with vena cava and end with vena cava)

Anterior ViewAnterior View

•Rinse your heart under the sink and pat it dry with paper towel

•Notice the coronary artery angling from the left atrium to the right ventricle

Label Label external external structuresstructures

Posterior ViewPosterior ViewPosterior ViewPosterior View

Right SideRight Side

Right SideRight SideStart your Start your

incision in the incision in the vena cava and vena cava and cut through the cut through the rt. Atria and rt. rt. Atria and rt. Ventricle all the Ventricle all the way to the apex.way to the apex.

Start your Start your incision in the incision in the left atrium and left atrium and continue continue through the left through the left ventricle to the ventricle to the apex.apex.

Left SideLeft SideLeft SideLeft Side

• Open Open heart on heart on dissection dissection tray.tray.

•Be sure to Be sure to pat your pat your heart dry heart dry with paper with paper towel towel before before attaching attaching labelslabels

Posterior half

Anterior half

Rt.

Lt.

That’s All folks!…and don’t forget

to clean up.

Clean UpClean UpClean UpClean Up Dispose of paper towels and labels Dispose of paper towels and labels Hearts go into the blue plastic bag (Ms. Harder)Hearts go into the blue plastic bag (Ms. Harder) Wash all of your tools and rinse your dissecting Wash all of your tools and rinse your dissecting

trays (remove bottom and rinse if possible)trays (remove bottom and rinse if possible) Lay removable bottoms over the edgeLay removable bottoms over the edgePlace dry tools on paper towel on tray Place dry tools on paper towel on tray

bottoms!bottoms!Leave kits open!Leave kits open! Wipe off all countersWipe off all counters Dispose of your gloves in the garbageDispose of your gloves in the garbage Wipe off your apron (pail and rag on front bench)Wipe off your apron (pail and rag on front bench)