Nervous System 125-135

Front

What is the sacral plexus?

Back

A network of nerves in the lower back that supplies the pelvis and lower limbs, including the common peroneal nerve.

Front

Which nerve is part of the sacral plexus?

Back

Common peroneal nerve.

Front

What is absent in mature neurons?

Back

Centrioles.

Front

What are the main types of synapses based on impulse transmission?

Back

Unidirectional chemical junctions and bidirectional electrical junctions.

Front

What is a unidirectional chemical synapse?

Back

A type of synapse where neurotransmitters are released from the presynaptic neuron and bind to receptors on the postsynaptic neuron, allowing for one-way communication.

Front

What is the role of neurotransmitters in synaptic activity?

Back

Neurotransmitters are chemicals that transmit signals across a synapse from one neuron to another.

Front

What does a diagram of synaptic activity typically show?

Back

It shows sending and receiving neurons, neurotransmitter release, and the synapse.

Front

Which cranial nerve is responsible for facial expression?

Back

Facial nerve (Cranial Nerve VII).

Front

What is the function of the facial nerve?

Back

It controls the muscles of facial expression and conveys taste sensations from the anterior two-thirds of the tongue.

Front

What is the significance of the nucleolus in neurons?

Back

The nucleolus is involved in ribosome production; however, its presence is not a defining feature of mature neurons.