Peripheral Nervous System Concepts

The video tutorial explores the peripheral nervous system (PNS), detailing its components, including nerves and ganglia outside the central nervous system (CNS). It examines the structure of peripheral nerves, highlighting nerve fibers, connective tissues, and the myelin sheath. The tutorial also covers the longitudinal section of nerves, focusing on the arrangement of nerve fibers and nodes of Ranvier. Additionally, it introduces ganglia, including dorsal root, sympathetic, and parasympathetic ganglia, comparing their structures and functions.

What does the peripheral nervous system (PNS) consist of?

• Only the cerebellum and cerebrum

• Only the spinal cord

• All nerves and ganglia outside the CNS

• Only the brain and spinal cord

What is the function of the perineurium in peripheral nerves?

• To surround each nerve fiber

• To form the myelin sheath

• To connect nerve fibers to the CNS

• To surround a bundle of nerve fibers

What is the role of Schwann cells in nerve fibers?

• To form the myelin sheath

• To protect the CNS

• To connect neurons to blood vessels

• To produce neurotransmitters

What is the function of the epineurium?

• To protect individual nerve fibers

• To surround the entire nerve

• To connect neurons to muscles

• To form synapses

Where are the sensory neuron cell bodies primarily located in the dorsal root ganglia?

• In the brain stem

• In the center of the ganglion

• Along the outer portions of the ganglion

• Near the spinal cord

What is a distinguishing feature of sympathetic ganglia compared to dorsal root ganglia?

• Presence of centrally located nuclei

• Presence of lipofuscin granules

• Tightly packed neurons

• Absence of satellite cells

What type of neurons are found in sympathetic ganglia?

• Bipolar neurons

• Unipolar neurons

• Pseudounipolar neurons

• Multipolar neurons

Where are parasympathetic ganglia typically located?

• In the brain

• Near the spinal cord

• Within or near the organ they innervate

• In the dorsal root

What is a common feature of neuron cell bodies in parasympathetic ganglia?

• Lack of nucleoli

• Presence of basophilic cytoplasm

• Absence of satellite cells

• Presence of myelin sheath

What is the role of satellite cells in ganglia?

• To form the myelin sheath

• To regulate the chemical environment of ganglion cells

• To transmit nerve impulses

• To connect ganglia to the CNS