Remembered from the bog wall in Physiology

From Experience I'll wager
That Pectoralis Major
Is as fine as any piece of tender steak
And superficial fascia
From underneath a gnasher
As succulent potato I will take

But if that is not your preference
May I prescribe with deference
An evening with the Monophosphate shunt
And you'll dream of far off lands
And palpating Racquel's glands
As you slowly row her homeward in a punt

Though work become your master
And the pace is getting faster
And pleasures have a transient complexion
Let you not forget
If a parting you regret
There are plenty naked women at dissection

(Three lines here I can't remember-anyone help?)

So down your tools
Your women too
There's welcome here for you
Growing senile on an MBChB