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 corpuscle | — | 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 corpuscle well developed | — | 26-28 | 15 | |
| Plates begin to differentiate | 26-28 (very rudimentary except tongue) | 18 | ||
| Data: Hewer (1935)[1] (human weeks appear to be fertilization age based on CRL) Links: timeline | chicken | skeletal muscle | ||||
- ↑ Hewer EE. The development of nerve endings in the human foetus. (1935) J Anat. 69(3):369-79. PMID 17104543
