Hayes platesense cone see nesium

H-band The region in the center of the A-band of a sarcomere characterized by myosin filaments and absence of actin filaments.

head n. [A.S. haefod] 1. The anterior body region. 2. (ANN: Polychaeta) The prostomium and peristomium. 3. (ARTHRO) Bearing the eyes, antennae and mouth parts. 4. (nemata) Comprising the lips and sensory organs, oral opening and supporting head skeleton.

head apodeme (ARTHRO: Crustacea) In crayfish, fused endo-pleurite and endosternite forming an area for muscle attachment at the anterior end of the skeleton.

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