Template:Hewer1935 table 2
From Embryology
Striped muscle and tendon | Sensory nerve endings | Motor nerve endings | Human (approximate age) weeks | Chick (Tello) (approximate age) days | |
---|---|---|---|---|---|
Beginning differentiation | — | — | 7 | 5 | |
Myofibrils appear | Exploratory fibres with bulbous endings penetrate into muscles | 8 | 6 | ||
Great increase of connective tissue. Vast numbers of nuclei | - | - | - | 6-7 | |
Isolated “fat” fibres | - | — | 10-12 | 7 | |
Varicose endings in contact with myotubes | - | 10 | — | ||
Tendon fibres diflerentiate | — | — | 12 | 10 | |
Beginning Pacinian bodies | — | 20 | 11 | ||
Multiplication of myotubes | — | - | 12-22 | 9-13 | |
Spindles differentiate | - | 20 | 12 | ||
Dissociation of myotubes from one another. Nuclei become peripheral | Spindles become complex | — | 22-26 | 13 | |
Pacinian bodies well developed | — | 26-28 | 15 | ||
Plates begin to differentiate | 26-28 (very rudimentary except tongue) | 18 |