心しん内ない膜まく

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Meanings

1

noun

endocardium

anatomy

Anatomical term for the inner lining of the heart chambers.

heart, mind, spirit

内inside, within, between

膜membrane

心しん筋きん
心筋 is the myocardium (heart muscle), while 心内膜 is the inner lining.
心しん外がい膜まく
心外膜 is the epicardium (outer layer), contrasting with 心内膜 as the inner layer.

Compound of 心 (heart) + 内膜 (inner membrane).