Neuromuscular junction in skeletal muscle:

Neuromuscular junction is a connective region of efferent nerve fibre of nerve system and muscle fibre of muscle system through synapses. The entire junction is covered by a cell, which known as Schwann cell, for insulation purpose. An invaginated membrane appearance present in this junction is called as synaptic gutter where axon neuronal end. Sub-neuronal clefts surround the axon terminal and it increases the surface area for synaptic transmitters. (Figure. 16.5)

 

Figure 16.5:  Neuromuscular junction

Structure of Visceral muscle
Visceral muscle or smooth muscles are fusiform in shape (Figure 16.6). They mostly present free in nature i.e., single fibre form. It has greater elasticity than the muscle fibre. Contractility and extencity are also higher than muscle fibre. Myosin, actin, troponin, tropomyosin, calponin, caldesporin are some of the protein present in the smooth muscles.

 

Figure 16.6:  Structure of smooth muscle