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Introduction to the Male Pelvis

• Clickontheskininthedissectionareatohighlightit(structures change colors when highlighted)

• Clickontheskinagaintoremoveit(now you see the fat and other subcutaneous tissue)

• Removethefatjustliketheskin

2 Now skin the cadaver to reveal the anatomy below:

Click on a structure to highlight, click again to dissect

Add, remove and highlight groups of structures with the Systems, Regions

and Tissues tabs

Name the other two major organs within the male pelvis:

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• Dragthereferenceplaneinthedissectionareabyitsgreenbordertothemiddleofthepelvis(the cross sections are numbered in the lower left corner, you should be close to 1890)

• Exploretheanatomyofthepelvisbymovingyourmouseoverthecrosssection(structures are identified in the upper right corner of the cross section area)

1 Start by setting the cross section through the area we want to explore:

Learning ObjectiveAftercompletingthisexercise,youwillbeabletonamethemajororgansofthemalepelvisandthemusclesformingthepelvicfloor.

Usethereferenceonthelefttolocatecontrolsandareasreferredtointhetextbelow.

• Zoominusingthemagnificationslider• Dragthedissectionwithyourmousetorepositionit• Selectthe“Regions”tab• Selectthe“UpperLimb”fromthelist• Clickthe“Remove”button

3 Take a closer look by centering the pelvis in the dissection area:1

4 Identify the organs of the pelvis by highlighting them:• Selectthe“Index”tab• Enter“Bladder”intothesearchbox• Selectthe“Urinarybladder”fromthelist• Clickthe“Add&Highlight”button

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Locate specific structures with the index

• Clickthe“Clear”buttontoemptythedissectionarea• Selectthe“Systems”tab• Select“Skeletalsystem”andclickthe“Add”button• Usingthe“Regions”tab ,removethe“UpperLimb”and“LowerLimb”asbefore• Alsousing“Regions”expandthe“AbdomenandPelvis”usingtheicontotheleftofit• Expandthe“Muscles”• Selectthe“PelvicDiaphragmandclick“AddandHighlight”

5 Isolate the muscles of the pelvic floor by simplifying the dissection:

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DissectionArea

Cross SectionArea

ControlArea

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What structure combines with the ejaculatory duct within the prostate gland?(Clinical Tip: The fact that this structure passes through the prostate, is the reason for symptoms associated with prostate enlargement in older males)

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Which major reproductive structure passes medially to the Ureter?

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Rotate the dissection using the left or right arrow key while holding the command (Mac) or ctrl (PC)

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Name the two muscles of the pelvic diaphragm? (Hint: You can find these from the dissection or the regions tab.)

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Move the cross section 1mm at a time by holding the command (Mac) or ctrl (PC) key while pressing the up or down arrow keys

Highlight multiple structures or un-highlight a single structure by holding the shift key when clicking

• Followthisstructureinferiorlyuntilitpassesthe“Seminalvesicle”andentersthe“Prostategland”• Clickthe“Clear”buttontoclearthedissectionarea• Inthecrosssection,locatetheleft“Seminalvesicle”andclickonittohighlight• Holdingdowntheshiftbutton,clicktohighlighttheright“Seminalvesicle”• Again,holdingshift,highlightthe“Prostategland”

(The seminal vesicles join with the ductus deferens to form the ejaculatory duct within the prostate)• Locatethe“Ejaculatoryduct”withinthe“Prostategland”• Followthisstructureinferiorly

• Rotatethedissectionto45°usingtherotationwheel orthecommand(Mac)orctrl(PC)key whilepressingtheleftorrightarrowkeystomove5°atatime• Right-clickontheright“OsseouspartoftheHipbone”andselect“Dissect”,dothesamefortheright“CartilageoftheAcetabulum”

• Usingthe“Index”,addandhighlighttheleft“Piriformis”and“Obturatorinternus”muscles• Also,addandhighlightthe“Sacrotuberousligament”

(These muscles and ligaments form the muscular floor or the pelvic cavity)

6 Construct the other muscles of the pelvic floor:

• Clickthe“Clear”buttontoclearthedissectionarea• Inthe“Systems”tab,expandthe“Skeletalsystem”andaddthe“Vertebralcolumn”• Expandthe“BonesoftheLowerlimb”andaddthe“Pelvicgirdle”• Alsofromthe“Systems”tab,addandhighlightthe“Urinary”and“Genital”systems• Gotothe“Action”menu,select“FitDissectiontoWindow”andchoose“Highlighted”• Right-clickontheleft“Ureter”justasitentersthepelvisandchoose“CrossSection”• Zoominonthecrosssectionbyusingthemagnificationslider• Followtheureterinferiorlytothebladderbyholdingdownthecommand(Mac)orctrl(PC)keywhilepressingthedownarrowkeytomove1mmatatimethroughthecrosssections

7 Visualize a more advanced anatomical concept, the Urogenital Tract:3

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