Questions: What is the space between the presynaptic terminal and muscle fiber called? Neural groove Myosulcus Synaptic fissure Synaptic cleft

The answer is the fourth one: Synaptic cleft.

Explanation for each option:

• Neural groove: This term refers to a structure in the developing embryo that eventually forms the neural tube, which becomes the central nervous system. It is not related to the space between a presynaptic terminal and a muscle fiber.
• Myosulcus: This is not a standard term used in neuroscience or anatomy related to synapses or muscle fibers. It is incorrect in this context.
• Synaptic fissure: While this term might seem related, it is not commonly used to describe the space between the presynaptic terminal and the muscle fiber. The correct term is "synaptic cleft."
• Synaptic cleft: This is the correct term for the small gap between the presynaptic terminal of a neuron and the muscle fiber (or another neuron) where neurotransmitters are released to transmit signals.

In summary, the space between the presynaptic terminal and muscle fiber is called the synaptic cleft.