Anatomy and Physiology Lab Presentation

Overview

• Professor Long's laboratory presentation on anatomy and physiology.
• Focused on the nervous system, specifically neurons.
• Session conducted via impromptu videos due to coronavirus shutdown.
• Aim: To visually aid understanding through models and drawings.

Lab Test 4 Overview

• Focus: Nervous system in Anatomy and Physiology 24:01 (Part 1).
• Study of the neuron model and synaptic knob model.
• Importance of understanding neuron shapes: axon, unipolar, bipolar, and multipolar neurons.

Key Concepts

Multipolar Neuron Model

• Structure:

  • Soma (Cell Body): Contains nucleus and perikaryon (dark-staining region around the nucleus).
  • Dendrites: Branches off the soma; highly branched structure.
  • Axon: Single long branch from soma; leads to telodendria and synaptic knobs.
  • Axon Hillock: Starting point of the axon.

• Perikaryon:

  • Area around the nucleus that stains darkly.
  • Contains various organelles.

Dendrites and Soma

• Dendrites and soma are not myelinated.
• Dendrites: Receive neurotransmitters from other neurons.
• Soma: Central part known as the neuron cell body.

Myelination

• Myelinated Neurons: Have a layer of myelin (fatty substance) that appears white (white matter).
• Unmyelinated Neurons: Appear gray (gray matter); includes dendrites and soma.

Schwann Cells and Myelin Sheath

• Schwann Cells: Wrap around axons to form myelin sheath.
• Myelin Sheath: Consists of multiple Schwann cells around an axon.
• Nodes of Ranvier: Gaps between Schwann cells.

Membrane Terminology

• Plasmalemma: General cell membrane.
• Sarcolemma: Muscle cell membrane.
• Neurolemma: Neuron's cell membrane.
• Axolemma: Membrane of the axon.
• Axoplasm: Cytoplasm inside the axon.

Conclusion

• Presentation includes demonstrations of neuron models.
• Explanation of how models correspond to theoretical concepts of neuron structure.
• Importance of understanding the detailed structure of neurons for lab and lecture comprehension.