§3.11.111 Τίνος μὲν οὖν ἕνεκέν ἐστιν ἕκαστον τῶν σπλάγχνων, εἴρηται, γέγονε δʼ ἐξ ἀνάγκης ἐπὶ τοῖς ἐντὸς πέρασι τῶν φλεβῶν·
11 Now, for what purpose each of the viscera exists has been stated, but they have arisen of necessity at the inner ends of the blood vessels.
ἐξιέναι τε γὰρ ἰκμάδα ἀναγκαῖον, καὶ ταύτην αἱματικήν, ἐξ ἧς συνισταμένης καὶ πηγνυμένης γίνεσθαι τὸ σῶμα τῶν σπλάγχνων.
For it is necessary that moisture should issue forth, and this of a bloody nature, from the condensation and solidification of which the body of the viscera is formed.
διόπερ αἱματικά, καὶ αὐτοῖς μὲν ὁμοίαν ἔχουσι τὴν τοῦ σώματος φύσιν, τοῖς δʼ ἄλλοις ἀνομοίαν.
Therefore they are bloody, and have a nature of body that is similar to themselves, but dissimilar to the other parts.
πάντα δὲ τὰ σπλάγχνα ἐν ὑμένι ἐστίν· προβολῆς τε γὰρ δεῖ πρὸς τὸ ἀπαθῆ εἶναι, καὶ ταύτης ἐλαφρᾶς, ὁ δʼ ὑμὴν τὴν φύσιν τοιοῦτος·
Moreover, all the viscera are enclosed in a membrane; for they need protection so as to be unaffected, and this must be light, and the membrane is of such a nature.
πυκνὸς μὲν γὰρ ὥστʼ ἀποστέγειν, ἄσαρκος δὲ ὥστε μὴ ἕλκειν μηδʼ ἔχειν ἰκμάδα, λεπτὸς δʼ, ὅπως κοῦφος ᾖ καὶ μηδὲν ποιῇ βάρος.
For it is dense so as to shield them, but fleshless so as not to attract or hold moisture, and thin so that it may be light and cause no weight.
§3.11.2μέγιστοι δὲ καὶ ἰσχυρὸτατοι τῶν ὑμένων εἰσὶν οἵ τε 2 περὶ τὴν καρδίαν καὶ περὶ τὸν ἐγκέφαλον, εὑλόγως· ταῦτα γὰρ δεῖται πλείστης φυλακῆς·
2 And the membranes around the heart and around the brain are the largest and strongest, and with good reason; for these parts stand in need of the greatest protection.
ἡ μὲν γὰρ φυλακὴ περὶ τὰ κύρια, ταύτα δὲ κύρια μάλιστα τῆς ζωῆς.
For protection is about the sovereign parts, and these are sovereign most of all over life.