The document summarizes key aspects of fish scales and skeletal muscles. It describes the main types of scales in fish (ganoid, leptoid, placoid, cosmoid) and how they can vary in size and structure between species and sexes. It also outlines the main functions of scales, including protection, roles in swimming and identification. The document then discusses the structure and function of skeletal muscles in fish, including muscle fiber anatomy, the sliding filament model of contraction, and how muscles are innervated and receive blood supply via motor units.

22. Comparison of Fish and Mammalian skin

34. d) myofibril c) muscle fibre b) muscle fibre bundle a) Muscle belly Components of skeletal muscle

41. Neuromuscular Junction Figure 9.7 (a-c)

43. Motor Unit: The Nerve-Muscle Functional Unit Figure 9.12 (a)

47. Any questions …….. Don’t shy