This insect's elytron has a very beautiful pattern.

When the myelin sheath of nerve cells is damaged, nerve transmission slows down.

The sarcolemma covers the muscle cells.

The leaf sheath of this plant is very long.

He has tendonitis and says his wrist hurts.

Do you know which insect this egg casing belongs to?

The myelin sheath protects nerve cells and helps transmit nerve signals.

The bow is in the bag and the sword is in the sheath.